AWA6223S Sound Level Calibrator. Instruction Manual HANGZHOU AIHUA INSTRUMENTS CO., LTD

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1 AWA6223S Sound Level Calibrator 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 calibrator keeps generating sound for 1 minute, after 1 minute it will automatically stop sounding. Press the ON / OFF button, it can be opened again. 3. When calibrating the sound level meter and the calibrator output sound pressure level is 74dB, make sure that outside ambient noise below 50dB. 4. When user hands the calibrator for a long time, it may affect the internal temperature sensor of instrument, resulting in a difference between the measuring temperature and the ambient temperature. 5. When wind speed measurement function is not in use, please turn off it for power saving. 6. When the instrument is not in use for a long time, press the On / Off" button to close it. In order to ensure the life of battery, please charge the calibrator once per 3 months. When the calibrator is undervoltage, the display will appear "X" at the battery, and the sound cannot be sustained, please charge the instrument. 7. If the instrument isn't out of power but cannot turn on, please short-circuit the No. 5 and 9 feet of RS-232 interface which at the bottom of sound calibrator, resetting the instrument.

3 CONTENTS 1. INTRODUCTION SPECIFICATIONS STRUCTURE KEYS FUNCTION RS-232 INTERFACE DEFINITION OPERATION METHODS SELECTION OF ADAPTOR TURN ON/ TURN OFF BACKLIGHT SWITCH THE DIFFERENT SOUND PRESSURE LEVEL EQUIVALENCE FREE FIELD SOUND PRESSURE LEVEL CLOCK SETTING OUTPUT RECORD RECORDER OPERATION METHODS RECORDING MODE RECORD INTERVAL SETTING START AND STOP RECORDING RECALL AND OUTPUT THE RECORDING DATA... 11

4 5.5 OUTPUT THE RECORDING DATA OPERATION AND MAINTENANCE OPERATING ENVIRONMENT CHARGING PERIODIC CHECKING APPENDIX A: OTHER MODE APPENDIX B: PACKING LIST... 18

5 1. Introduction The AWA6223 sound calibrator is a multifunction acoustic calibrator, mainly used for calibrating pressure sensitivity of test microphone and acoustic measurement instruments. It has automatic compensation of temperature and pressure. Comply with IEC The AWA6223S sound calibrator can generate 104dB, 94 db, 84 db and 74dB at 1 khz. The instrument can also be used as meteorological measurement recorder. It built-in high-precision temperature, humidity, barometric pressure sensor, can measure the ambient temperature, relative humidity, atmospheric pressure. The speed sensor is optional. This calibrator can save the 1280 groups of test records, and it can transfer data to PC or through printer (optional) Print out. 2. Specifications 2.1 Fulfills Standard: IEC Normal Sound Pressure Level(ref Pa) AWA6223S: 104dB, 94dB, 84dB, 74dB±0.3dB 2.3 Out Frequency: AWA6223S: 1000Hz±1% 2.4 Distortion: 1% 2.5 Stabilization time: 5s 2.6 Short-term stability: better than 0.1 db 2.7 Sound calibrator equivalent volume: 26cm3 1

6 2.8 Applicable microphone: complies with IEC ( no need adaptor)½ (use ½ adaptor)¼ (use ¼ adaptor) 1/8 (use 1/8 adaptor) 2.9 Referencing Environment: Air Temperature: 23 Atmospheric: kPa Humidity:50% 2.10 Working temperature Temperature:-10 ~ 50 Competitive Humidity: 10% ~ 90% 2.11 Environmental effect Temperature: <0.3dB Atmospheric: <0.3dB Relative Humidity: <0.3dB 2.12 Relative Humidity Measurement: Atmospheric: 65kPa ~ 108kPa Measuring Range: 5% ~ 90% Min seale mark: 0.1%, Error ±5% 2.13 Temperature Measurement: Measuring Range: -10 ~ 50 Min seale mark: 0.1%, Error ± Atmospheric Measurement: Measuring Range: 60kPa ~ 108kPa Min seale mark: 0.01kPa, Error ±0.5kPa 2.15 Out Interface: RS-232C 2.16 Working current: the current is less than 5mA when standby, when make sounding, it is less than 60mA 2.17 Dimensions: 155mm 50mm 40 mm 2.18 Weight: 236 g 2.19 Battery: TS-DV001-S005E rechargeable battery, 1Ah 2

7 3. Structure 3.1 Keys function Fig. 1 Power on/power off Setting Press for 3s~5s to power on /power off, press again is to let the calibrator to make sounding Press one time, the calibrator just enter the setting status, then press it again and again will move the cursor Output/In dex plus When under Calibrating status, this key is used to output data through RS-232 interface When under Setting status, this key is used to increase parameter values 3

Backlight/ Index minus When under Calibrating status, this key is used to open and close the backlight When under Setting status, this key is used to decrease parameter values

8 Backlight/ Index minus When under Calibrating status, this key is used to open and close the backlight When under Setting status, this key is used to decrease parameter values 3.2 RS-232 interface definition 1.+5V, can charge the calibrator 2.RXD 3.TXD 4. Wind speed sensor signal 1 5.GND 6.NC 7. Wind speed sensor signal 2 8. Reserve 9.Reset Fig. 2 4

9 4.Operation methods 4.1 Selection of adaptor Model AWA6223 Sound Calibrator can be used to calibrate φ23.77mm(1 ), φ12.7mm(1/2 )and φ6.5 mm(1/4 )measuring capacitor microphones. When calibrating 1 inch microphones, take out the 1/2 inch adaptor, put the measuring capacitor microphones into the coupling cavity of the sound calibrator directly. It can also be used to calibrate 1/2 inch measuring capacitor microphones. At this time, the 1/2 inch adaptor shall be put into the coupling cavity of the sound calibrator first. Then put the measuring microphones into the 1/2 inch adaptor. When calibrating 1/2 inch microphones, put the 1/4 inch adaptor into 1/2 inch adaptor directly, put the measuring microphones into the coupling cavity of the sound calibrator. 4.2 Turn on/ Turn off Press key for a while and the calibrator is switched on. The display will show the model of calibrator then display as following: 5

Fig.3 Calibrating status Press key again, the calibrator is sounding and Cali. will be showed in the lower-right corner of display. Calibrator will keep sounding for 60s then stop. So as the Cali.

10 Fig.3 Calibrating status Press key again, the calibrator is sounding and Cali. will be showed in the lower-right corner of display. Calibrator will keep sounding for 60s then stop. So as the Cali. will disappear. When the power consumption drops to above 5mA, the calibrator will enter standby status. In this status, the calibrator can be used continuously for 7 days. Press key for 3s will turn off the calibrator. 6

11 4.3 Backlight When in the operating interface, press the " " button, the backlight open; press again, the backlight close. 4.4 Switch the different sound pressure level AWA6223S can generate 104dB, 94dB, 84dB and 74dB at 1 khz. The default item is 94 db, press key, move the cursor to, then press or to switch the different sound pressure level. 4.5 Equivalence free field sound pressure level Normally, we use free fields microphones more often, e.g. microphones used for sound level meter and various environment noise measuring instruments. When using Model AWA6223 7

12 Sound Calibrator for calibration, should be correct the nominal sound pressure level to equivalence free field sound pressure level. The correct value is difference between pressure response and free field response of microphone. At the frequency 1000Hz, it is -0.4dB for 1 inch microphone and -0.2dB for 1/2 inch. i.e. to 1 inch free field response microphone and instrument using this microphone, the equivalence free field sound pressure level is 93.6dB. While to 1/2 inch free fields response microphones and instrument using this microphone, the equivalence free field sound pressure level is 93.8dB. Note: Due to different microphone structures, equivalence free field sound pressure levels of various model microphones are also different. Details will be provided by the microphone manufacturer. 4.6 Clock setting Press the " " button, move the cursor to data and time where you need to modify, click " " or " " key, after finishing set, press the " " button again, the cursor disappears, date and clock has been set up correctly. 8

13 4.7 Output Record Every time close the calibration, the instrument will automatically save the calibration record. When in Calibration function interface, click " " key, save in the internal record results and sent them out through the serial port, the baud rate of the serial port is 9600, 8, n, 1. The output data is ASCII code and the format is as following: DATE TIME kpa TC %RH m/s :20: :20: :20: :19: yy-mm-dd Wind speed hh:mm:ss Atmospheric Relative Humidity Temperature: 9

14 The record can be printed out when calibrator connected through the RS 232 transfer cable to PC or connect with AH40 mini-printer directly. 5.Recorder operation methods When using the recorder function, the calibration won t make sounding. 5.1 Recording Mode In shutdown interface, press and together, the display will show no record, then the calibrator is entering the recording mode. 5.2 Record interval setting Enter the record mode, press the " " key, there appears a cursor at "no, then press the " " or " " to set the record time interval. The optional recording interval: "1sec, 10sec, 1min, 10min, 1hr, 8hr, 1day. Here "1sec" recording interval means 10

15 each measuring group with an interval 1s; 10min means each measuring group with an interval 10min. The recorder starts from 1 minute later since exiting the setting status. 5.3 Start and stop recording When record interval setting is finished, press continuously till the cursor disappears, at the same time there will show LOGGING then you will find the cursor at the lower right corner. Now it is doing recording. If you want to stop recording, Press. 5.4 Recall and output the recording data When the calibrator is in the calibrating or recording mode, use RS-232 transfer cable to connect with PC. 11

16 5.5 Output the recording data On computer screen, click Start -> Accessories -> Communications -> HyperTerminal, it will show as following: Input AWA6223, click OK. 12

17 Choose COM1 and click Ok. (According to need to choose serial port) 13

18 Choose the setting see above, click OK. Then press on the calibrator, it will get all the recording data in computer. 14

19 Click Transfer or Capture Text under main menu. 15

20 6.Operation and maintenance 6.1 operating environment Temperature range: -10 ~ 50 Relative humidity: <90% Atmospheric pressure: 65kPa ~ 108kPa 6.2 Charging Built-in battery: 3.7V lithium battery Battery capacity: 1000mAh Rechargeable times: 500 times Please charge the calibrator through 5V extension power adapt or (configured with the calibrator). When the CHARGE (green) l ight on the instrument panel of is lit up, means it is in chargi ng; when FULL (red) light is lit up that means fully charged; w hen those lamp light together, means there s something wrong of charging. 6.3 Periodic checking 16

21 The sound calibrator shall be sent to the metering department for calibration periodically (e.g. once one year) to ensure its accuracy. When calibration, if it is found that the sound pressure level is not 94dB, it can be regulated. Screw off back-lens, and adjust the internal potentiometer with small screw driver to make it produce 94dB sound pressure level. (Note: measured by pressure field response laboratory standard microphone and relevant measuring amplifier). It is unnecessary to regulate SML. Generally, the customer is not allowed to regulate due to lack of corresponding instruments. When test 84 db and 74 Db sound pressure level, make sure the external environmental noise should be less than 40dB. Appendix A: Other mode DEBUG mode In shutdown interface, press and together, the display will show DEBUG, then the calibrator is entering the DEBUG mode. The mode can adjust the internal parameters of instrument. Th is mode is mainly used by manufacturer. 17

22 Appendix B: Packing list Standard configuration No. Items Quantity 1 Sound calibrator 1 2 ½ inch adaptor 1 3 5V power adaptor 1 4 Operating manual 1 5 Test report 1 6 Calibration certification 1 Optional function and accessories No. Items Quantity 1 ¼ inch adaptor 1 2 AH40 mini-printer 1 3 RS232 transfer cable 1 4 AH40 mini-printer cable 1 5 Wind speed function 1 18

TITLE PAGE I. Safety Information II. General Description III. Specifications IV. Controls V. Calibration Procedures VI. Measurement Preparation

C O N T E N T S TITLE PAGE I. Safety Information. 1 II. General Description.. 1 III. Specifications.. 2-3 IV. Controls... 4-5 V. Calibration Procedures........ 6 VI. Measurement Preparation....7 VII. Operating