ASV 5910 Noise Dosimeter

Transcription

1 ACOUSTICS & VIBRATION MEASURING INSTRUMENTS ASV 5910 Noise Dosimeter Instruction Manual HANGZHOU AIHUA INSTRUMENTS CO., LTD

2 Notes 1. Please read the instruction carefully before using the instruments for the first time. 2. The diaphragm inside of the microphone is not covered under warranty. 3. Other damage caused by misuse is not covered under warranty. 4. Battery should be fully charged and discharged at least once per month. 5. The instrument needs to be repaired with a warranty.

3 Frequently Asked Questions 1.Press the instrument power button does not get any response. The instrument cannot be powered on. Solution: a. The battery is out. Plug in the electrical cord, and reboot the meter again. b. Instrument is in the state of display-off mode, and the keys are locked. To unlock it, press up and down parameter keys at the same time. c. The instrument set up a regular boot, so should press the enter key for up to 2 seconds then release. d. The battery is damage. Replace the battery refer to Appendix D. 2. After connected to the PC via USB cable, the computer cannot read the U-disk. Solution: a. Check if the connection is well connected. b. Try to use another USB port from PC. c. Go to the main menu of instrument 3.data 3.connect USB, and change the mode to be connect USB ok. 3. There is a big difference between two measurement results got from two channels. Solution: a. Check whether both channels are using the same frequency weighting. You can go the SETUP1 to setup the frequency weighting of two channels. b. Check the sensitivity level of microphones for both channels. You can go to main menu/6.cali to calibrate the two channels.

4 Table of Contents 1. Introduction Features Specifications Terminology Structure Appearance Keys function Indicator light Key components Display interface Items on the main menu Meas submenu Big display interface List measurement interface Setup1 submenu st page of Setup nd page of Setup rd page of Setup th page of Setup th page of Setup th page of Setup Setup2 submenu Starting setup Logging setup Recording setup (Basic version does not have record function) Hardware settings Power supply setup Calendar clock adjustment Pause/ Rerun setup Data submenu Data recall Clear all Turn to U disk mode... 32

5 6.6 Information submenu Calibration submenu Acoustic calibration Calibration setup Calibration history list Measurement of personal sound exposure Charge the battery Calibration Setup of the instrument Invoke parameter combinations kept in the instrument Personalized setup Fix of the instrument Data collection Processing data /3 OCT Analyzer(for add version only) Turn 1/3 OCT Analyzer on and choose the channel /3 OCT analysis Log how the 1/3 OCT analysis vary with time Appendix A Appendix B Appendix C Packing list (Basic version)... 50

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7 1. Introduction Model ASV5910 personal noise dosimeter is a dual-channel acoustic measuring instrument developed with digital signal processing technology. It adopts modular design with versatile, high performance, small size, low power consumption and some other advantages. The two channels can simultaneously measure the indexes of average sound pressure level, equivalent sound level, statistical sound level, and sound exposure level. It can also log how the sound pressure level changing over time and the classic version can do precision sound-recording. It can serve as a sound level meter, an integrating meter, a statistic analyzer, a personal noise dosimeter, a digital recorder, and etc. A basic version does not have the large-capacity memory modules as classic version does, so it does have function of logging, but with lower prices. 2. Features 2.1 Make simultaneous measurement through dual channels 2.2 Integrating measuring, SPL (sound pressure level) logging and recording simultaneously 2.3 Huge storage of 2G (for classic version only) 2.4 USB port, no need for driver 2.5 Portable and easy to fix 2.6 Flexible power-on and power-off mode 2.7 Meet hearing protection standards of many different countries 3. Specifications 3.1 Channel: dual channels 3.2 Microphone: 1/4" testing pre-polarized condenser free field microphone, including preamplifier whose sensitivity level is about -53dB; or 1/2" testing pre-polarized condenser free field microphone, including preamplifier whose sensitivity level is about -30dB. 3.3 Measuring range: Measuring range: dBA, dBC, dBZ (for microphone with sensitivity level of -53dB) HANGZHOU AIHUA INSTRUMENTS CO., LTD 1

8 Peak C sound level measuring range: dB Measurement range: dBA, dBC,50-120dBZ (for microphone with sensitivity level of -30dB ) Dose exposure measurement range: 0.01Pa 2 h ~ 99.99Pa 2 h Noise dose measuring range: 0% ~ 9999% 3.4 Frequency range: 20Hz-12.5kHz 3.5 Frequency weighting: A, C, Z for each channel 3.6 Time weighting mode: F, S, I and peak synchronously for each channel 3.7 Integrating time: 1 seconds ~ 24 hours 3.8 Detection characteristics: real RMS digital detection 3.9 Fulfill standards: IEC ,Class 2 IEC61252 ANSI S1.25: Measuring index: L XYp, L Xeq,T, L XYmax, L XYmin, L N, SEL, Lex8h, LAVG, TWA, DOSE, SD, Lx, peak Note: x is A, C, Z; y is F, S, I; and N is Display: LCD 3.12 Data storage: 2GB Flash RAM (for classic version) 192kB Flash RAM (for basic version) 3.13 Measuring groups storage: Max of 8000 groups (for classic version) Max of 96 groups (for basic version) 3.14 Other storage: 32 groups of parameter combinations, 128 groups of measuring names, 128 groups of calibration records 3.15 Statistic analysis module: Number of modules: 2 Sampling interval of statistical analysis: 0.01s Parameters of statistical analysis: Lmax, Lmin, LN Note: N is an integer from 1 to 99. You can choose either 5 of them in each statistical analysis module Personal sound exposure module Number of modules: 2 Measurement index: TWA, LAVG, E, Lex8h Exchange rate: 3, 4, 5 and 6 Threshold value: 40~90 2 HANGZHOU AIHUA INSTRUMENTS CO., LTD

9 3.17 Data logging: Logging content: simultaneously log N/A or Leq,T, LAVG, Peak and specified Lmax or Lmin for each channels Logging interval: 1Min, 2Min, 5Min, 10Min and 20Min optional (for basic version) 0.01s~6.00s for time-weighted SPL (sound pressure level), 0.1s~60s for short-time equivalent SPL (for classic version) Logging time: 1 seconds ~ 24 hours, if set logging interval of 1 min, the calculated time could up to 200 hours for basic version Recording (for classic version only) Recording precision: 32kHz/16bit,16kHz/16bit,8kHz/8bit(optional) or 48kHz/16bit, 24kHz/16bit, 12kHz/8bit (ordered by users) Channel: 1 or 2 Trigger way: triggered in synchrony with integral measuring or triggered when overrun. If value of overrun is set, the recording time ranges from 10s to 90s. Maximal record time: 32kHz/16bit: 9 hours 16kHz/16bit: 18 hours 8kHz/8bit: 72 hours 3.19 Output interface: Mini USB port, no driver 3.20 Dimensions: 65mm 55mm 18mm 3.21 Mass: 85g 3.22 Temperature range: -15 ~ Power supply: The instrument is equipped with lithium-ion rechargeable battery which can provide over 16 hours continuous operation after fully charged. HANGZHOU AIHUA INSTRUMENTS CO., LTD 3

10 4. Terminology Exchange Rate Threshold Criterion LFp LSp LIp Leq,T Lpeak LFmax LFmin LSmax LSmin LImax LImin SEL E Lex,8h LAVG Glossary and icon descriptions Increase value of TWA when the noise dose doubles When the time-weighted SPL(sound pressure level) is lower than the threshold value, it does not participate in the calculation of TWA(average SPL, time-weighted) and LAVG (average SPL). When the noise dose is above the criterion value, the relevant indicator lights. Max value of F-weighted SPL (sound pressure level) within 1 second Max value of S-weighted SPL within 1 second Max value of I-weighted SPL within 1 second Equivalent-continuous SPL for time T. T is the integral time which can be set casually from 1s to 24 hr Peak value of SPL Maximum sound pressure level(spl), F-weighted Minimum sound pressure level(spl), F-weighted Maximum sound pressure level(spl), S-weighted Minimum sound pressure level(spl), S-weighted Maximum sound pressure level(spl), I-weighted Minimum sound pressure level(spl), I-weighted Sound exposure level Personal sound exposure, expressed in Pa 2 h Equivalent SPL for 8 hours Average value of SPL 4 HANGZHOU AIHUA INSTRUMENTS CO., LTD

11 TWA DOSE LN Linst Average value of SPL, Time-weighted Noise dose, which is the percentage of time that a person is exposed in noise that is potentially damaging to hearing. The value of 100% represents the noise exposure has exceeded the standard Statistic SPL. N is an integer ranges from 1 ~ 99 and can be casually chosen by the user The instant value of time-weighted SPL Battery level display Microphone setup: diffusion field type Integrating measurement and statistical analysis are in progress Integrating measurement and statistical analysis are paused logging the varying waves of SPL over time Recording Peak of the measured signal exceeds the measurement limit. The measured signal is below the measurement limit HANGZHOU AIHUA INSTRUMENTS CO., LTD 5

12 5. Structure 5.1 Appearance LCD Display Microphone & Wind screen Preamplifier Indicator LED Keys Fig.1 Top-view USB Port Fig.2 Right-side-view 6 HANGZHOU AIHUA INSTRUMENTS CO., LTD

13 Reset Button Fig.3 Top-side view Fig.4 Bottom view HANGZHOU AIHUA INSTRUMENTS CO., LTD 7

14 Extension Cable Notes: Match the red spot of plug and socket. Extension Cable plug Extension Cable Socket LCD LED Keys Tie clip Preamplifier Microphone & Wind-screen Fig.5 Meter with extension cable The structural characteristics of ASV5910 may be different depends on the different configuration, and the major differences are focused on microphone and preamplifier. 8 HANGZHOU AIHUA INSTRUMENTS CO., LTD

15 5.2 Keys function Power on/off Enter Exit Left Power the ASV5910 on or off Go to the sub menu or input the current operation Exit from the current menu or current operation. Move the cursor to the left Right Up Move the cursor to the right. Index increase by one, or one page up Down Index decrease by one or one page down Reset button: By pressing the reset button, CPU of the instrument will be reset. The data that is in processing will be lost after reset the meter, the pre-saved data won t be affected. 5.3 Indicator light Full (green): when it lights, this means the interior battery is fully charged. If the Full and Charge indicators light together, this means the battery charge fails. Sometimes it is caused by the high temperature of the battery. Charge (red): when it lights, this means the interior battery is being charged. USB (green): when it lights, this means ASV5910 is connected with PC via USB cable and can be operated. Work(blue): If it is blinking, this means ASV5910 is making integrating measurement. If the Work indicator lights solid, it means HANGZHOU AIHUA INSTRUMENTS CO., LTD 9

16 measurement is paused. Limit(green): When it lights, this means the measured noise is above the threshold value. Over(yellow): When it lights, this means the peak value of the measured noise exceeds the upper limit of measurement range and it turns off 1 second later if the range limit is not exceeded again. Harm(red): When it lights, this means the measured noise exceed the hearing protection limit. 5.4 Key components 1/4 "or 1/2" free field test condenser microphone Model: AWA14435 or AWA14427 Note: Collision Prohibited 10 HANGZHOU AIHUA INSTRUMENTS CO., LTD

17 6. Display interface Press Enter key for 3 seconds and ASV5910 is switched on. The instrument will automatically check itself and display as Check Self. If everything is ok, the main menu appears. Seen as following: 6.1 Items on the main menu Fig.6 Main Menu 1.Meas : for normal measurement 2.Setup1 : for parameter setup before measurement 3.Data : to check or delete the data which is saved in the instrument. It also helps you to turn the data into USB flash disk mode. 4.Setup2 : for setup of starting mode, logging mode and recording mode 5.Info. : to view the information of the instrument 6.Cali. : for instrument calibration and view the calibration history ASV5910 (V1.0) : model number of the instrument (the optional software version) Press Exit key on the keypad for over 5 seconds and ASV5910 will be switched off Meas submenu Move the cursor to 1.Meas and press Enter key, 1.Meas submenu is shown. There are two kinds of display interface on 1.Meas submenu, one is Big display interface and another is List display interface. How to enter the different interfaces depends on the key pressing on previous menu. HANGZHOU AIHUA INSTRUMENTS CO., LTD 11

18 6.2.1 Big display interface Channel Frequency weight Power supply Display mode Fig.7 Big display interface Recording model Under the Big display interface, the data are displayed in larger font and only one measurement parameter. The bottom row of the screen displays the working status of the instrument: (from left to right) battery voltage, direction of the microphone, logging mode, display mode, the name of the displayed index, measuring range and measuring state. Under this interface the cursor can be moved to Big, LFp and 0. Press Enter key and the instrument begins integrating measurement, statistical analysis and data logging. If you press Enter key again, both the integrating measurement and statistical analysis are paused. If you want to return to the main menu, press Exit. Chart 1 Displayed indexes where the cursor locates Cursor The next index after pressing the Remarks location up or down key Big List Shift between two measurement display mode LFp LSp, LIp, Leq,t, Lpeak, Leq,T, LFmax, LFmin, LSmax, LSmin, Shift between the measuring indexes LImax, LImin, SEL, Lex8h, LAVG, TWA, DOSE, L5, L10, L50, L90, L95, SD 0 1 Switchover of the channel 12 HANGZHOU AIHUA INSTRUMENTS CO., LTD

19 Indicators Chart 2 Indicators of the working status Meanings Battery level display Microphone setup: diffusion field type Integrating measurement and statistical analysis are in progress Integrating measurement and statistical analysis are paused logging the varying waves of SPL with time The instrument is recording Peak of the measured signal exceeds the measurement limit. The measured signal is below the lower limit of measurement range. L0 The instrument is logging the SPL of channel 0 L1 The instrument is logging the SPL of channel 1 L2 The instrument is logging the SPL of channel 0 and 1 simultaneously W0 The instrument is recording signals on channel 0 W1 The instrument is recording signals on channel 1 W2 The instrument is recording signals on channel 0 and 1 simultaneously HANGZHOU AIHUA INSTRUMENTS CO., LTD 13

20 6.2.2 List measurement interface Channel number Measuring index Direction of the microphone Display mode Logging Fig.8 List display interface You can enter this interface by pressing Enter key on the main menu, or move the cursor on Big and press the up or down key while in Big display interface. See Fig 8. The bottom row on the screen displays the working status: (from left to right) battery voltage, direction of the microphone, logging mode, display mode, recording mode, measuring range and measuring state. The front 3 rows on the screen show three different measuring indexes. The last line shows the operation mode of the instrument. The meanings of the icons are displayed in chart 2. The first 5 characters on the front 3 rows is the name of the measurement index, the last one is the channel number. The cursor can move between List, LFp on first line, 0, LSp on second line, 0, LIp on third line. Press Enter key and the instrument begins integrating measurement, statistical analysis and data logging. If you want to return to the main menu, press Exit key. 14 HANGZHOU AIHUA INSTRUMENTS CO., LTD

21 Cursor location Chart 3 the cursor location and other available options under List display interface Other available options displayed after press the up or down key Remarks List Big Switchover of the measurement interface LFp LSp, LIp, Leq,t, Lpeak, Switchover of the Leq,T, LFmax, LFmin, LSmax, LSmin, LImax, LImin, SEL, Lex8h, LAVG, TWA, DOSE, L5, L10, L50, L90, L95, SD indexes 0 1 Switchover of the channel Notice: Indexes shown in figure 3 are LFp, LSp, Lip. You may see 3 different indexes while switching on the instrument because the display depends on the setup last time. When you are in Big or List measurement interfaces, and you press Exit key after the instrument has started measuring, the screen will show as follows: Fig.9 Exit indication The cursor can move between 1., 2., 3.. When the cursor is on 1. : If you press Enter key, the instrument will store the current measurement results and return to the main menu; When the cursor is on 2. : If you press Enter key, the instrument will delete the current measurement results and return to the main menu; When the cursor is on 3. : If you press Enter key, the instrument will be back to measurement interface without doing anything. HANGZHOU AIHUA INSTRUMENTS CO., LTD 15

22 6.3 2.Setup1 submenu Move the cursor on 2.Setup1 which is on the main menu and press Enter key, the instrument will enter 2.Setup1 interface and display as follows: Fig.10 Setup work mode & Ts st page of Setup1 Work Mode : To meet different measurement standards and purposes, ASV5910 has many parameters for you to choose. You can preset the parameters according to the relevant standards and purposes, divide them into different parameter combinations and make different names. Then you need only to choose the relevant parameter combinations for your measurement requests and do not need to set every parameter. If there are not proper parameter combinations in the instrument, ---- is displayed behind and new parameters combinations can be made by PC. ASV5910 can store at most 32 parameter combinations. See the operation manual in the instruction of dosimeter management software. Ts=00h00m00s : preset measuring time. When reach the pre-set time, the instrument will stop integral measurement, statistical analysis, data logging and save the measurement results meanwhile. It can be set from 1 second to 24 hours. Name: AWA5910_00 : the measurement group name of the results. The former 4 characters will be kept as the former 4 characters of the filename saved in USB flash disk. The instrument can save 128 measurement group names at most. You can write new names by PC. See the operation manual in the instruction of dosimeter management software. P:1 : page 1 The cursor can be moved between P:, Work Mode, h, m, s, Name. Press Exit or Enter key and back to the main menu. 16 HANGZHOU AIHUA INSTRUMENTS CO., LTD

23 Chart 4 the cursor location and the relevant available options on page 1 Cursor position Available options Remarks P: 2 or 6 Page turning Work Mode Next preset work Choose other work mode mode h 01h to 24h Set hours m 01m to 59m Set minutes s 01s to 59s Set seconds Name Next preset measurement name Recall other measurement names nd page of Setup 2 Move the cursor on P:1 and press the up key, the instrument will enter page 2 and display as following:: Fig.11 Setup Ln & Mic. MIC. Mode : the mode of microphone. Free and Random mode are optional, means free field type and random incidence type. The ASV5910 is equipped with free field microphone by the producer. If random incidence microphone is requested by some countries standards, change the option to Random, so the instrument will automatically modify the high frequency to meet the request of frequency response of random incidence microphone. N:5, 10, 50, 90, 95 (the statistic numbers). 5 statistic sound levels can be measured simultaneously through either channel of the instrument. You can set the statistic numbers from 1 ~ 99 casually. Auto name : whether to use the pre-set name selected by the instrument. If Yes is chosen, the instrument will auto use the pre-set name created by the meter itself for the finished measurement. The cursor can be moved between MIC.Mode, 5, 10, 50, 90, 95, Auto name and P:. Press Exit or Enter key to go back to the main menu. HANGZHOU AIHUA INSTRUMENTS CO., LTD 17

24 Chart 5 the cursor location and the relevant available options on page 2 Cursor position Available options Remarks P: 3 or 1 Turn over the page MIC. Mode Random, Free Change the type of the microphone 5, 10, 50, 90 or Numbers from 1 to 99 Set statistic sound level 95 Auto Name N/A, Yes Whether automatically make name by the instrument rd page of Setup1 Move the cursor on P:2 and press the up key to turn over to page 3 of the setup1. It will be shown as below: Fig.12 Setup weighting Fre.Weight : there are two characters follow Fre. Weight, which represent the frequency weighted mode. The first one is the frequency weight of channel 0 and the second one is that of channel 1. Sta.Weight : time weighted for statistical analysis.(ln: n can be set by the user, see 6.3.2) The cursor can be moved between Fre.Weight, Sta.Weight and P:3. Press Exit or Enter key to return to the main menu. 18 HANGZHOU AIHUA INSTRUMENTS CO., LTD

25 Chart 6 the cursor location and the relevant available options on page 3 Cursor position Available options Remarks P: 4 or 2 Page turning Fre.Weight A C, A Z, A A, C Z, C C, Z Z Set frequency weight of 2 channels Sta.Weight F F, S F, I F, F S, S S, I S, F I, S I, I I Set time weight for statistical analysis of 2 channels th page of Setup1 Move the cursor on P:3 and press the up key to turn over to page 4 and display as following:: Fig.13 Setup Dosimeter 0 Exchange Rate0 : exchange rate of Dosimeter 0, which can be set between 3, 4, 5 and 6. This parameter influences the calculated results of TWA, Dose and LAVG. Threshold0 : the threshold value of Dosimeter 0, which can be set from 40 to 90dB. If time weighted SPL less than the value, it will not participate in TWA, Dose and LAVG calculations. Criterion0 : the criterion value of Dosimeter 0, which can be set from 70 to 90dB. Regulated by the relevant law of the criterion value of 8 hours should be input th page of Setup1 Move the cursor on P:4 and press the up key to turn over to page 5 and display as following: HANGZHOU AIHUA INSTRUMENTS CO., LTD 19

26 Fig.14 Setup Dosimeter1 Exchange Rate1 : exchange rate of Dosimeter 1, which can be set between 3, 4, 5 and 6. This parameter influences the calculated results of TWA, Dose and LAVG. Threshold1 : the threshold value of Dosimeter 1, which can be set from 40 to 90dB. If time weighted SPL less than the value, it will not participate in TWA, Dose and LAVG calculations. Criterion1 : the criterion value of Dosimeter 1, which can be set from 70 to 90dB. Regulated by the relevant law of the criterion value of 8 hours should be input th page of Setup1 Move the cursor on P:5 and press the up key when on page 5 under 2.Setup1 interface, the instrument will turn over to page 6 and display as following:: Fig.15 Setup TWA Setup frequency weighting and time weighting which will be used when calculate TWA for 2 dosimeter modules. Note: the optional frequency weighting is determined by the frequency weighting setup of the 2 channels Setup2 submenu Move the cursor on 4.Setup2 and press Enter key when on the main menu, the instrument will enter page 1 under 4.Setup2 interface and display as following: 20 HANGZHOU AIHUA INSTRUMENTS CO., LTD

27 Fig.16 Page 1 of 2.Setup2 submenu 2.Setup2 is for setup of starting mode, logging mode, recording mode, hardware, power supply, clock and automatically-pause. Move the cursor on P:1, then press Up or Down key and enter page 2. It displays as follows: Fig. 17 Page 2 of 2.Setup2 submenu Move the cursor on P:2, then press Up or Down key and enter page 3. It displays as follows: Fig.18 Page 3 of 2.Setup2 submenu Starting setup When on page 1 under setup 2 interface, move the cursor to the first row, press Enter key and enter starting setup interface. It displays as follows: Fig.19 Timed-start Source : trigger source, including Clock, Button, Interval and Limit. Applications of each trigger source are listed in the Chart 7: HANGZHOU AIHUA INSTRUMENTS CO., LTD 21

28 Chart 7 Applications of the trigger sources No Source Remarks 1 Clock Start when reach the specified time 2 Button Start by pressing the Button 3 Interval Start when each time measurement has the equivalent intervals 4 Limit Start when the currently selected weighted instantaneous value for statistics exceeds the specified limit value Clock method When choose Clock, Date and Time are displayed on second row on the screen. You can preset a certain time, and when the preset time is reached, the instrument will automatically start measuring. You can move the cursor on Year, Month, Day, Hour, Minute and Second either, and use Up or Down key to adjust the time. When a parameter reaches its end, it displays ** which means the parameter does not participate in comparison. So the instrument can be triggered once an hour, once a day, or once a month Button method When choose Button, it displays as follows: 22 Fig.20 Button-pressing start Run Delay : delay time for starting measurement can be set after pressing the Enter key. If 0s is chosen, the measurement begins at once. 0 ~ 9s can be chosen. Note: Though some certain trigger mode is chosen, you can still start measurement by pressing the Enter key while on 1.Meas submenu Interval method HANGZHOU AIHUA INSTRUMENTS CO., LTD

29 When choose Equivalent interval, the instrument displays as follows: Fig.21 Interval method Delta_T : interval time for each starting measurement, which can be set between 1min, 5min, 10min, 20min, 30min and 1hour. 1min means the instrument starts after 1 minute from every time measurement finished. 5min means starts after 5 minute from every time measurement finished. Note: when the preset measurement time Ts exceeds the interval time, the actual measurement time follows Ts, the actual activation interval is prolonged Limit method When choose Limit, the instrument displays as follows: Fig.22 Limit method Value : the preset limit value. If the value is exceeded, the instrument will start measurement. The value can be set between 40 ~ 140. Delay : the continuous limit-surpassing time. The instrument starts measurement when the time-weighted average index SPL for analysis of channel 0 surpasses the limit. The measurement will continue when the accumulated limit-surpassing time exceeds the Delay value, otherwise it stops. The value can be set from 0 to 999s Logging setup When on page 1 under Setup 2 interface, move the cursor to the second HANGZHOU AIHUA INSTRUMENTS CO., LTD 23

30 row, press Enter key and enter logging setup interface. It is shown as following: Fig.23 Logging setup Log : Yes or N / A Sample : can choose from 1Min, 2Min 5Min, 10Min, and 20Min. Context : simultaneously measure all parameters from Leq,T, Peak, Lmax, plus one from LAVG and Lmin, for both two channels. LAVG and Lmin can be picked by cursor selecting. Chart 8 Logging content No. Context Logging content 1 N/A Not log 2 Leq,T Log the equivalent SPL for time T 3. LAVG Log the average value of SPL 4. LPeak Log the peak value of SPL 5. Lmax Log the max value of SPL 6 Lmin Log the min value of SPL Sample : Sample interval. You can set the parameter from 0.01s to 6s when Linst is chosen. If Leq,t is chosen, you can set the parameter from 0.1s to 60.0s. Channel : 0, 1 and 0&1 optional. 0 means logging the SPL of channel 0; 1 means logging the SPL of channel 1; 0&1 means logging the SPL of channel 0 and 1 simultaneously.(for classic version only) Recording setup (Basic version does not have record function) Move the cursor to the third row when on page 1 under setup 2 interface and press Enter key, you can enter recording setup interface. It displays as follows: 24 HANGZHOU AIHUA INSTRUMENTS CO., LTD

31 Fig.24 Recording setup Type : Recording type. N/A, 32kHz,16bit, 16kHz,16bit, 8kHz,8bit optional. Chart 9 Recording type No. Type Applications 1 N/A No recording 2 32kHz,16bit High sample frequency, high accuracy. big capacity files for further analysis. 3 16kHz,16bit Medium sample frequency, medium capacity files for further analysis. 4 8kHz,8bit Low sample frequency, low capacity files only for monitoring Channel : recording channel. 0, 1 and 0&1 are optional. 0 means recording the waves of channel 0; 1 means recording the waves of channel 1; 0&1 means recording the wave of both channel 0 and 1. Trigger : trigger way of recording. You can choose between Synchrony and numerical values. Synchrony means recording keeps pace with integral measurement, i.e. recording the waves while measurement starts, recording accomplished while measurement finished. Numerical values means the instrument starts recording the waves when the average index SPL for analysis of relevant channel surpasses it. The value can be set among 1 ~ 120. Record setup1 : page 1 under recording setup interface. Press Up or Down key to enter the next page while the cursor stays here. It displays as follows: HANGZHOU AIHUA INSTRUMENTS CO., LTD 25

32 Fig.25 Page 2 under Recording setup Record time : Time for limit-surpassing recording activation. 10s, 20s, 30s, 40s, 50s, 60s, 70s, 80s and 90s are optional. If Synchrony is chosen on last page, =Ts is displayed and setup can not be made. CH0 0dB, CH1 18dB : Volume of channel 0 or channel 1 while recording. You can adjust the parameter every 6dB from 0 to 48 db. If the measuring signals are small, you might choose the higher volume to let the amplitude of recorded waves bigger. If the measuring signals are large, you might choose the lower volume in case the amplitude of the recorded waves are limited. Use Up or Down key to adjust the volume of each channel to let the displayed topmost volume bar stay above 1/2 of the dial and also not occupy the whole dial Hardware settings Move the cursor to the first row on page 2 under Setup 2 interface. Press Enter key to go to following interface: Fig.26 Hardware setup MIC. Input : setup of microphone input connection. The instrument can connect two microphone Left and Right at the same time. There are 2 measurement channels inside it and the way how the microphone connected to the channel depends on the setup. Display : screen saver. You can choose from Always, 10s, 20s, 30s, 40s, 50s, 60s, 70s, 80s and 90s. Always means the display screen is always on, while 10s ~ 90s means the screen shut off automatically within the specified time if there is no operation on the instrument. Locked : operation lock. While Yes is chosen, after screen turns off automatically, only press both the Up and Down keys together to turn on the screen again. 26 HANGZHOU AIHUA INSTRUMENTS CO., LTD

33 Chart 10 microphone connection mode No. Option Connection mode 1 0 channel 0 Left MIC. channel channel0 Right MIC. channel Left MIC. Right MIC. channel 0 channel Power supply setup Move the cursor to the second row on page 2 under setup 2 interface. Press Enter key and enter Auto-on /Auto-off setup. It displays as follows: Fig.27 Power supply setup The operations under the 2 interfaces are the same. HANGZHOU AIHUA INSTRUMENTS CO., LTD 27

34 Auto-on/Auto-off Fig.28 Auto-on/Auto-off Note: When enter Auto-off interface, Auto-off is displayed on the bottom row. Mode : working mode of Auto-on or Auto-off which can be chosen between N/A and Clock. When N/A is chosen, the instrument will not switch on or off at the fixed time. When Clock is chosen, the instrument will switch on or off when the internal clock reaches at the fixed time. Date : the fixed date for Auto-on/Auto-off. Time : the fixed time for Auto-on/Auto-off. You can move the cursor on Year, Month, Day, Hour, Minute and Second either, and use Up or Down key to adjust the time. When a parameter reaches its end, it displays ** which means the parameter does not participate in comparison when auto-on or auto-off. So the instrument can switch on or off once an hour, once a day, once a month It is suggested that the Auto-on or Auto-off function is used together with Timed Activation function (see ) to make automatic measurement. Note: when Auto-on is set, the instrument powers off when power supply is shut off and the operating current is less than 5mA Power off When you choose Auto-on and back to Power supply interface, Power off is displayed on the screen. See as follows: Fig.29 Power-off 28 HANGZHOU AIHUA INSTRUMENTS CO., LTD

35 Move the cursor to the third row, press Enter key and the instrument shut off. When it reaches the set Auto-on time, the instrument switches on automatically and enters into the measurement interface directly. Note: If Auto-on is set, you must press the Enter key for more than 2 seconds to switch on the instrument Calendar clock adjustment Move the cursor to the third row on page 2 under setup 2 interface. Press Enter key and enter calendar clock adjustment setup interface. It displays as follows: Fig.30 Calendar clock adjustment You can move the cursor on Year, Month, Day, Hour, Minute and Second either, and use Up or Down key to adjust the time. After the adjustment, press Enter or Exit and back to page 2 under setup 2 interface Pause/ Rerun setup Press Enter key on page 3 under setup 2 interface and enter pause/rerun setup interface. It displays as follows: Fig.31 Pause/Rerun setup Note: when enter Rerun setup, Rerun Clock is displayed on the bottom row. Mode : working mode of Pause/Rerun. You can choose between N/A or Clock. When N/A is chosen, the instrument will not pause or rerun at the set time; when Clock is chosen, the instrument will power on or power off HANGZHOU AIHUA INSTRUMENTS CO., LTD 29

36 while the internal clock reaches at the specified time. Date : the specified date for power on / power off. Time : the specified time for power on / power off. You can move the cursor on Year, Month, Day, Hour, Minute and Second either, and use Up or Down key to adjust the time. When a parameter reaches its end, it displays ** which means the parameter does not participate in comparison when turn on or turn off. So the instrument can Pause or Rerun once an hour, once a day, once a month It is suggested that the automatically power on and off can be used at the same time so that ASV5910 can automatically measure Data submenu Move the cursor on 3.Data on the main menu and enter submenu of data management. It displays as follows: Fig.32 Submenu of data management 1.Recall data : to recall the data stored in the instrument 2.Clear all data 3.U-Disk mode Data recall Move the cursor on the first row under data management interface, and press Enter key. It displays as follows: First row: the header; Fig.33 Data recall 30 HANGZHOU AIHUA INSTRUMENTS CO., LTD

37 Last row: working status of the instrument, from left to right is: battery voltage, data recall total groups of the data; Middle: the serial number and name of each group of data. The > on the far left is the cursor. Note: If the measurement name is WAVE FILE, it means the file is recording results of waves and cannot recall data. The instrument displays serial number with measurement date or measurement time by pressing Up or Down key. Press Cursor key and the cursor can be moved to the next row. When the cursor is moved to the bottom of the screen, the screen will automatically turn the pages; when reach the bottom of the file list, the screen will return to page1. You can press Enter key and view the data that the cursor is pointing at. See the followings: Fig.34 Display the measurement result Press Up or Down key and you can view the previous page or the next page; press Left or Right key and you can view the second column; press Enter key and it displays as follows: 1.Del.this file : Press Enter key when the cursor stays here, the instrument will delete the data group which is being viewed. HANGZHOU AIHUA INSTRUMENTS CO., LTD 31

38 2.Display log : Press Enter key when the cursor stays here, the instantaneous SPL will be displayed. If the instantaneous SPL is not logged while integral measuring, 2.Display log will not be displayed and the instantaneous SPL layout is shown as follows: Fig.35 Measurement result display Press Right key under this interface and the data of next column will be displayed; press Up or Down key the data of next page will be displayed Clear all If you press Enter key when the cursor stays on the second row on data management submenu, the instrument will warn as follows: Fig.36 Data delete If you want to delete all the data in the instrument, press Enter key; otherwise, press other key to return Turn to U disk mode Press Enter key while the cursor stays on the second row on data management submenu, the instrument will turn the stored data into FAT32 format to let the data be read correctly when the instrument is connected to PC as a U disk. When the instrument works as a U disk, the filename inside is composed of 3 parts: the former 4 characters of the measurement name, 4 serial numbers and the filename extension. The filename extension includes 3 kinds:.asv for integral analysis data, LOG for logged data, WAV for 32 HANGZHOU AIHUA INSTRUMENTS CO., LTD

39 recording data. ASV and LOG files can be opened by Notepad or Excel program while WAV files can be opened by windows media player. 6.6 Information submenu Move the cursor on 5.Info. on the main menu and press Enter key, instrument information interface is entered. See as follows: Fig.37 Instrument information Serial no : The instrument serial number is Version: S_1.0/H_1.0 :The software version of the instrument is 1.0, the hardware version is 1.0. Build: Jun : The software of the instrument was written on Jun 27, File numbers: 12 : 12 data groups are kept in the instrument. Free Blocks: 8103 : 8103 Blocks are available for 8103 groups of data to keep Made: : The instrument was produced on Aug 1, Press Up or Down key under this interface, the clock display interface is entered. See as follows: Fig.38 Hours and minutes display of the clock Current time is displayed under the interface. If you press Cursor key, Up or Down key, it will change the display time. HANGZHOU AIHUA INSTRUMENTS CO., LTD 33

40 Fig.39 Months and days display of the clock If you press Enter key when calendar clock is on display, the instrument will automatically shut off and be in the standby mode, with the power consumption being about 4mA. Press Enter key again and the instrument turns on display again. 6.7 Calibration submenu Move the cursor on 6.Cali. on the main menu and press Enter key, the submenu of Calibration is entered. See as follows: Fig.40 Calibration submenu First row: Acoustic calibration. You can use acoustic calibrator to calibrate the sensitivity of the instrument. Second row: Calibration setup. You can set the SPL of the acoustic calibrator, or the sensitivity of the microphone. Third row: Calibration history of the instrument Acoustic calibration Move the cursor on the first row and press Enter key, then you enter the calibration interface. It displays as follows: Fig.41 Acoustic calibration of microphone 0 34 HANGZHOU AIHUA INSTRUMENTS CO., LTD

41 Lp= db 94.0 : The latter 94.0 is the SPL of the calibrator, i.e. the SPL for the instrument to be calibrated. The data after Lp= is the SPL which is measured by the instrument during the calibration. Lx= db : The latter is the sensitivity level of microphone 0. The data after Lx= is the newly calibrated sensitivity level of the microphone. When sound level calibrator is covered on the microphone, turn on the power supply. Press Enter key to initiate the calibration process. A number is displayed on the lower right corner of the screen, which changes to 9 from 0 and then stops, Press Enter key and the new microphone sensitivity level is saved. If you want to calibrate microphone 1, press Up or Down key and the following message appears: Fig.42 Acoustic calibration of microphone 1 Then follow the above steps to make the calibration Calibration setup Move the cursor on the second row when on the calibration submenu, press Enter key and enter calibration setup interface. The following message appears: Fig.43 Calibration setup MIC.No:0 : means the current displayed information belongs to microphone 0. You can switch it to microphone 1 by pressing Up or Down key while the cursor stays here. Serial : Serial number of the microphone set by the producer. It cannot HANGZHOU AIHUA INSTRUMENTS CO., LTD 35

42 be modified. MIC.Sen. : Sensitivity level of the microphone. You can adjust the sensitivity level of the microphone by pressing Up or Down key while the cursor stays here. Cali.SPL : Sound pressure level of the calibrator. If your calibration SPL is not 94.0dB, press Up or Down key to make it reach the output SPL of the calibrator. Press Enter key after the adjustment, the instrument will save the operation and display OK on the lower right corner of the screen Calibration history list Move the cursor on the second row while on calibration submenu, and press Enter key, you can enter the calibration history list. The following message appears: Fig.44 Calibration history list One row for one calibration record. One calibration record includes record time and the sensitivity level of the microphone. You can view the calibration history of microphone 1 by pressing the Cursor key. Up or Down key will help you turn the pages. Press Enter key and the instrument will ask you whether to delete the calibration history. If press Enter key again, all of the calibration history will be erased. 36 HANGZHOU AIHUA INSTRUMENTS CO., LTD

43 7.Measurement of personal sound exposure The measurement of sound exposure of a worker in work place includes the following 7 steps: 1 Fully charge the attached battery; 2 Calibrate the instrument with a acoustic calibrator and inspect whether the instrument works properly; 3 Set the relevant parameters according to the place that will be measured; 4 Fix the instrument securely on worker s body; 5 Upload the measurement data in the instrument to a PC; 6 Analyze the measurement data by PC. 7.1 Charge the battery There is a lithium-ion rechargeable battery of 3.7 volt inside ASV5910. When the battery voltage is lower than 3.5V, the instrument will indicate undervoltage and should be charged in time. When the battery voltage is lower than 3.4V or continuously undervoltage for 90s, the instrument will shut itself off. If it is integral measuring when shutting off, the integral measurement will be saved first. You can charge the instrument via the Mini USB port of the instrument. There are 2 charge indicator lights beside the Mini USB port. Connect the 5V power supply to the Mini USB port, or connect the instrument to the PC USB port with a USB cable. If the red light bright, it means the instrument is being charged. When the battery is fully charged, the green light bright and the red one is off. The charging lasts about 3 hours. If both lights bright, it means the battery damaged or there are some problems in the charging circuit. To insure the batter is sufficiently charged each time before use. Should it be charged every month if it is not in use for long time, for keeping the battery service time. HANGZHOU AIHUA INSTRUMENTS CO., LTD 37

44 7.2 Calibration Calibration for one condenser microphone Calibrate the instrument each time before use. Put a 1/4 adaptor into the calibrator model AWA6221 and let calibrator covered on the microphone turn on the power supply. Enter the measurement interface (see Figure2 or Figure3). The value of LFP is being read by the instrument, the deviation of which should be within ±0.5dB of the calibrator SPL output. If the tolerance is surpassed, the instrument should be calibrated. See the following example: If the authorized calibrator SPL is 93.9dB, the LFP value read by the instrument should be between 93.4dB and 94.4dB. If the range is surpassed, press Exit key to return to the main menu; then press Left or Right key to move the cursor on 6.Cali and press Enter key to enter Calibration submenu (see Figure35). Move the cursor to the first row and press Enter key, you will enter the acoustic calibration interface (see Figure36). Let calibrator covered on the microphone turn on the power supply. Press Enter key to initiate the calibration process. A number is displayed on the lower right corner of the screen, which changes to 9 from 0 and then stops, Press Enter key and the new microphone sensitivity level is saved Calibration for two condenser microphone If the instrument is equipped with double microphones for 2 channels, the 2 microphones should be calibrated. The calibration progress is the same as in When microphone 0 is calibrated, press Up or Down key to turn to the calibration interface of microphone 1 and perform the calibration of microphone Setup of the instrument Invoke parameter combinations kept in the instrument The instrument keeps 32 parameter combinations by the producer to meet measurement standards of different countries and different measure purposes. You need only to choose the proper parameter combinations according to the measuring standards and working hours in the measured workplace. 38 HANGZHOU AIHUA INSTRUMENTS CO., LTD

45 You can also write your user-defined parameter combinations by a PC (see 7.3.2). Chart 4 the content of parameter combinations No. Content of parameter Operating position combinations 1 The name of work mode Row 1 on page 1, setup 1 2 Preset measuring time Row 2 on page 1, setup 1 3 Filename number Row 3 on page 1, setup 1 4 Microphone type Row 1 on page 2, setup 1 5 Statistic SPL Row 2 on page 2, setup 1 6 Choose measurement group name Row 3 on page 2, setup 1 automatically 7 Frequency weighting of 2 channels Row 2 on page 3, setup statistic analysis modules, time Row 3 on page 3, setup 1 weighting 9 Exchange rate of noise dosimeter 0 Row 1 on page 4, setup 1 10 Threshold value of noise dosimeter Row 2 on page 4, setup Criteria value of noise dosimeter 0 Row 3 on page 4, setup 1 12 Exchange rate of noise dosimeter 1 Row 1 on page 5, setup 1 13 Threshold value of noise dosimeter Row 2 on page 5, setup Criteria value of noise dosimeter 0 Row 3 on page 5, setup 1 15 Frequency and time weighting of Row 2 on page 6, setup 1 dosimeter 0 16 Frequency and time weighting of Row 3 on page 6, setup 1 dosimeter 1 17 Start mode Activation setup on setup 2 submenu 18 Delay start time Activation setup on setup 2 submenu 19 Activation time under Timed-activation mode Timed-activation under activation setup interface on setup 2 submenu 20 Limit value under limit-surpassing activation mode limit-surpassing activation under activation setup interface on setup 2 submenu 21 limit-surpassing time limit-surpassing activation under activation setup interface on setup 2 submenu HANGZHOU AIHUA INSTRUMENTS CO., LTD 39

46 22 Interval time under equivalent interval activation mode equivalent interval activation under activation setup interface on setup 2 submenu 23 Logging content Logging setup interface on setup 2 submenu 24 Logging interval Logging setup interface on setup 2 submenu 25 Logging channel Logging setup interface on setup 2 submenu 26 Microphone Hardware setup interface on setup 2 submenu 27 Delay time display Hardware setup interface on setup 2 submenu 28 Lock function Hardware setup interface on setup 2 submenu 29 Auto-on function Power supply setup interface on setup 2 submenu 30 Auto-off function Power supply setup interface on setup 2 submenu 31 Auto-on time Power supply setup interface on setup 2 submenu 32 Auto-off time Power supply setup interface on setup 2 submenu 33 Recording mode Page 1 under recording setup interface on setup 2 submenu 34 Recording channel Page 1 under recording setup interface on setup 2 submenu 35 Recording activation Page 1 under recording setup interface on setup 2 submenu 36 Recording time Page 1 under recording setup interface on setup 2 submenu 37 Volumn of channel 0 Page 2 under recording setup interface on setup 2 submenu 38 Volumn of channel 1 Page 2 under recording setup interface on setup 2 submenu 39 Pause/rerun mode Pause/rerun setup interface on setup 2 submenu 40 Pause time Pause setup interface on setup 2 submenu 41 Rerun time Rerun setup interface on setup 2 submenu 42 List display interface 1.Meas submenu 40 HANGZHOU AIHUA INSTRUMENTS CO., LTD

47 43 channel number of the lower 3 List display interface on 1.Meas rows under List display interface submenu 44 Index of the lower 3 rows under List display interface List display interface on 1.Meas submenu 45 Index under Big display interface Big display interface on 1.Meas submenu To measure the personal sound exposure value, the measuring time and frequency weighting of 2 channels must be precisely preset. If the value of TWA is to be measured, the exchange rate and threshold value also should be set correctly Personalized setup If your requirements is beyond the parameter combinations, choose a similar parameter combination and enter setup 1 or setup 2 submenu to adjust it. Timed-start, Pause/Rerun, Auto-on/Auto-off setups, etc. will make personal sound exposure more convenient. Logging the instant value and short-time equivalent value helps to analyze how the noise varies with time. Recording helps the subjective assessment of the noise. For example, monitoring a factory which opens at 8:00, has a break from 12:00 to 14:00, closes at 18:00 and makes one week s continuously sampling. The setup of the instrument is as follows: Start mode: timed-start; start time: **-**-** 8:00:00 ; measuring time: 8h00m00s; Pause/Rerun is on, the preset time for pause is **-**-** 12:00:00 ; the preset time for rerun is **-**-** 14:00:00 ; Auto-on/Auto-off is on, preset Auto-on time at **-**-** 7:50:00, Auto-off time at **-**-** 18:10:00. After the setup, only need to fix the instrument on the sampled worker before 8:00 AM every day and remove it after 18:00 PM. The user-defined setup makes the measurement more easy and convenient. HANGZHOU AIHUA INSTRUMENTS CO., LTD 41

48 7.4 Fix of the instrument There are several fix ways on the sampled person. See the followings: 1. fixed on the safety helmet 2. fixed on the shoulder 42 HANGZHOU AIHUA INSTRUMENTS CO., LTD

49 3. Fixed it on belt, with microphone clipped on collar. 7.5 Data collection All the measuring results except the recording files, which are stored in Flash RAM in the instrument, can be reviewed by recalling results in the instrument. The instrument will let the measurement data keep in it into U disk mode. If new measurement data are logged, you can also change them into U disk mode under 3.U-Disk mode on data management menu. Then connect the instrument with a PC via a USB cable and the instrument works a U disk. Now you can copy the files in the instrument. 7.6 Processing data There are 3 kinds of files in the instrument: 1.Files of integral and statistical analysis data with.asv file extension: Can be opened by Notepad or Excel. 2. Files of logged data with.log file extension: Can be opened by Notepad or Excel. 3.Files of Recorded data with.wav file extension: Can be opened by windows media player. The 3 kinds of files can also be opened by the personal noise dosimeter software with the data turned into EXCEL format. See operations in the instruction of personal noise dosimeter management software. If further analysis of the stored data is needed, Noise View software will be helpful. HANGZHOU AIHUA INSTRUMENTS CO., LTD 43

50 8.1/3 OCT Analyzer (for add version only) If the instrument contains 1/3 OCT Analyzer module, it is capable of real-time 1/3 OCT analyzing, integral measuring and analysis result saving. The following functions and operations are only available for the instrument with 1/3 OCT Analyzer module. Standards met: IEC61260 Class 2 Filter: real-time 1/3 OCT parallel Centre frequency of the filter: 20Hz, 25Hz, 31.5Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 1kHz, 1.25kHz, 1.6kHz, 2.0kHz, 2.5kHz, 3.15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz. Measurement index: instant SPL at all center frequencies, Lmax,1s, Leq,t, Leq, Lmax, Lmin. 8.1 Turn 1/3 OCT Analyzer on and choose the channel Enter Setup 1, move the cursor on Page and turn to page 7 by pressing the Up or Down key. See as follows: Fig.45 1/3 OCT setup The cursor shifts between Switch, Channel, P:. When the cursor stays on Switch, the following On or Off can be shifted by pressing the Up and Down keys. When it is On, it means the 1/3 OCT analysis is initiated, simultaneous with integral measuring and statistic analyzing. When the cursor stays on Channel, you can choose the channel for 1/3 OCT analysis by pressing the Up and Down keys. The relevant frequency weight is displayed behind. If you want to choose other frequency weighting, see operations in HANGZHOU AIHUA INSTRUMENTS CO., LTD

51 8.2 1/3 OCT analysis Open the 1/3 OCT Analyzer on page 7 under setup 1 interface; Return to the main menu and enter measurement submenu, the instrument begins 1/3 OCT analyzing. Move the cursor on Big or List and pressing Up or Down key, you will enter 1/3 OCT analysis interface. See as following: Center Frequency SPL Fig.46 1/3 OCT analysis interface Frequency spectrogram is displayed under this interface. The instrument will automatically display the peak frequency and the relevant frequency band SPL. You can also view the SPL at a certain center frequency by the vernier. Under this interface, the cursor can be moved between 1/3, Linst and 10kHz. When the cursor is on 10kHz, the vernier location will be changed by Up or Down key. When it turns into Max@, the vernier vanishes while the peak frequency and the relevant frequency band SPL are displayed. Press Enter key to start the following measurements: integral measurement, statistical analysis and data logging. If you press Enter key again, both the integral measurement and statistical analysis are paused. If you want to return to the main menu, press Exit. 8.3 Log how the 1/3 OCT analysis vary with time Choose the proper logging content and channel under logging setup interface in 2.Setup1, then enter measurement submenu and press Enter key to begin the integral measuring. The instrument will log time-weighted SPL and 1/3 OCT analysis simultaneously. HANGZHOU AIHUA INSTRUMENTS CO., LTD 45

52 Appendix A The Comparison Chart of frequency response for free field microphone and diffusion field microphone settled in free field with degree of HANGZHOU AIHUA INSTRUMENTS CO., LTD

53 Appendix B Nominal free field response for instrument settle in the approximation reference conditions with reference direction HANGZHOU AIHUA INSTRUMENTS CO., LTD 47

54 Appendix C Battery replacement method When the battery is damaged, or cannot last for 8 hours working after full charging, the battery should be replaced. Replacement method is shown as follows. 1. Unscrew 4 screws on the battery cover with a small screwdriver, as shown below: 2. Remove the rear cover and got out the battery. 48 HANGZHOU AIHUA INSTRUMENTS CO., LTD

55 3. Fit with a new battery, and check whether the equipment can be normally booted or not. Charging the battery, and observing the display of the battery icon to make sure it is increasing. 4. Close the battery cover. Then tighten up 4 screws on the battery cover. Note: When not in use, preferably, at least fully charge and discharge the battery once per month. HANGZHOU AIHUA INSTRUMENTS CO., LTD 49