Feature: Instruction NC, constant current battery discharge instrument It can display battery voltage, discharge current, time, battery capacity, power, total power, resistance Auto remember the last set of discharge voltage and the discharge current Backlight can be used software controlled switch There are constant load resistance test function Specification: Supply voltage: 5V micro usb Supply current: About 70ma, off the backlight <1ma Battery discharge voltage: 0-15v, 1mv step The initial battery voltage: 0-15V Discharge current: 0.1A - 3A, Step 0.01A. But also effect by the 20W discharge power limit. Accuracy: Voltage does not exceed 10mv, current does not exceed 5ma. (Battery resistance uses of the DC method, so accuracy is not high.)
Battery cut-off voltage reference set: Select the type of battery Applicable battery nominal voltage Ni-Cd hydrogen 1.2-1.5V 1.0V Lithium phosphate 3.0-3.3V 2.5V Lithium battery 3.6-3.8V 3.0V Mobile power 4.8-5.2V 4.0V Lead-acid battery 12-14V 10.5V Termination voltage Ue Wiring: Micro usb connection power supply:
1. Four-wire connection: from the battery positive and negative, respectively, leads to two lines. Two lines lead out from the battery positive, connect A+ V+. Two lines lead out from the battery negative, connect V- A-. A+ A- should use thick line, the discharge current is passed through from here. V+ V- can uses thin line. Both sides of the board has marked. 2. Two-wire connection: On the main control board, short connect the V- A- and V+ A+. Two lines lead out from the battery holder (positive and negative), respectively connect to A+ A-.
Note: Measure battery internal resistance please use four-wire connection. Four-wire and two-wire connection looks the same, considering the wire resistance, then is not the same, discharge power has exceed 8W, it needs home cooling fan.
How to use? (PIC 1: Main control board) Micro usb female connect 5v power supply. The upper left corner pin serial port to be connected to 5v power supply. 5v power supply need only connect micro usb, one of serial port pin. (PIC 2: Boot interface) 1. Set the cut-off voltage, the discharge current. After start-up, enter PIC2 boot interface. Buzzer will beep when boot. The second line on the LCD display setting cut-off voltage, the discharge current, the first line shows the battery voltage current. Line 2 blinking, means that you can press + or - to adjust. Press the Select key to move the cursor. After setting up, press the Start button to enter the discharge mode. (PIC3 discharge main interface)
2. After entering the discharge mode, see pic 3 discharge screen. The first line shows the discharge voltage, discharge current, the discharge current may change constantly as instructions for performing current feedback, the range of change is less than the current 5ma. The second line shows the discharge time, the battery capacity. Battery capacity unit is ah, show only a special symbol, arranged vertically AH. Press the + key to make the first line of the display setting switch voltage and current, actual voltage current. When the actual voltage is displayed, the penultimate line of the first character is R. When the display setting voltage and current, the first line of the penultimate character is S. Press the "-" button to change the second line of the display. You can display the discharge capacity x.xxxah, x.xxx Ω within the resistance. Show resistance within three seconds after discharge. It can also display the power, total power, the unit is w, wh 3. Press the Start button to return to the main menu, the time capacity will be cleared. Press the Select key also return to the main menu, but time capacity is not cleared, the timer is not timely, time-keeping. Return to the main menu, the discharge current will becomes 0 4. Battery end of discharge, or the battery voltage is less than the setting cut-off voltage will stop the discharge. The first line of the reciprocal of a smiley face character display. Time counting is stopped, the battery capacity does not change. LCD backlight starts flashing. At this time you can press the plus or minus button to make the backlight always on. You can press the start key to return (time, capacity is cleared), press select to return (time capacity is not clear). 5. If the battery voltage is less than the setting cut-off voltage, press the start button will display Bat <vol set!!!, press the start button to return to the main menu. If the battery voltage is higher than 15v, displays vol high!!, press Start to return to the main menu. In this case it must be reduced or disconnecting the battery, otherwise, always show vol high!!
(PIC4 Main menu) 6. Main Menu function selection: Boot screen long press the SELECT button to enter the main menu. Press the plus or minus key to select the function, select the function of the cursor blinks. Press the select button to enter the selected function. Press Start to return to the main menu between to enter the function. Main menu functions: 1. main menu 2. bat res 3. c source 4. load mah 5. bat choose 6. pat set Main menu screen showing the boot screen. (Figure 5 Resistance Measurement) 8. bat res: Fig5 is a resistance measurement interface. The first line of the far right of the display Z, this function can measure the internal resistance of the battery directly. Press the Select button to select the current size. Press Start to start measuring internal resistance. The first line shows the battery voltage and current. Measuring resistance except that a short pulse current to test resistance, accuracy is not high. It includes wiring resistance, contact resistance of the electrode. But the four-wire connection it is difficult to eliminate contact resistance.
(Figure 6: a constant current source) 9. c source. The figure 6 is a constant current source function. The first line shows the current and voltage. The second line shows the current setting of the constant current source. Press the select key, plus or minus key to set the current size. The difference with battery capacity test is that in this function, even if take away the battery, it will not exit, re-access the battery, the current will reaches the specified current, if the discharge of the battery capacity is not enough, it will not exit this function mode (FIG7 battery capacity memory recovery) 10. load mah In the power and memory capacity of the unit discharge process, will memory the discharge capacity. Each additional 100mah, recorded once. Enter the main menu load mah, will display the Figure 7 interface. Press Select to load the last time discharge memory capacity, and the second line will show "Mah is". Last discharge capacity will displayes for 3 seconds. The best note of this parameter. From the beginning of this capacity accumulated discharge capacity. Press the start button without loading, discharge capacity from 0.
(Figure 8 backlight selection) 11. Par set Function selection: The machine parameters selection. (Figure 9 Fan start power selection) 12. The parameters of the first item is back light Referring to Figure 8. Press the plus or minus key to display the second line ON, OFF, AUTO. ON and AUTO means backlight is always open. Off means the backlight is always off. Press the select key to set the selected memory, press the start button does not remember the new settings. Then proceed to the next setup interface 13. wat of fan: fan control. Set W vaule, if the power is greater than this value, the fan starts. Press plus and minus keys to change the W vaule. Press Select key to save, press tart button not to save. Then enter into the next setting interface Note: If the discharge power exceeds 8W or current exceeds 2A, please replace a large radiator or add fans. 14. beep setting: buzzer switch ON, AUTO both means open. Off means turn off. Press the Start button to enter the next setting screen 15. temperature: For the test use only, press the start button to enter the next setting screen
(Figure 10 current mode selection) 16. cur0.1? (Fig 10) The current machine has two modes: constant current discharge, the discharge current is reduced to 0.1x after constant. The second mode is after constant current discharge is completed, then reducing the discharge current is gradually reduced to 0.1x setting current (not less than 0.1a). Reach the cutoff voltage discharge until the end. This way is effectively to inferior battery, the battery can release more capacity. Selection Method: The interface of FIG. 12. Press plus or minus keys to move the cursor. If the cursor is in Y, means the selection 0.1x discharged, the battery icon becomes empty battery. If the cursor is in N, means the selection of constant current discharge, the battery icon becomes 3 grid power. Press the start button, do not save the settings, press the Select key to save the settings. FIG. 12
Calibration 1. Prepare a voltage adjustable power supply (0-15V). Calibration voltage and current needs a high precision multimeter, voltage stable adjustable voltage source. Disconnect the power discharge device, press the plus or minus key at the same time and does not let go, then power on, enter the calibration interface. Adjustable voltage source positive and negative connect to the battery terminals of the instrument. When calibration requires uses four-wire connection. (Figure 11 Voltage Calibration) 2. Step 1: Figure 11 voltage calibration interface: The adjustable voltage source to 0.924V, The first line shows the calibration voltage. Press the Select button to change the position of the cursor, press the plus or minus keys to change the value at the cursor position. So that the display actual voltage is consistency with adjustable voltage supply on the first row. The cursor on the first line to the right of the "Y" when press the start button is to save data, then enter the next process. Cursor is not "Y" when press the start button without saving the data and enter to the next step. 3. Step 2: 5v 1v calibration, adjustment is the same with the above. (Figure 12 current calibration, 0a and 0.05a)
4. Step 3: Figure 12 current calibration interface: The positive voltage supply and discharge device in series between the A + ammeter. The first line left shows the current 0.000a. At this time disconnect a+ terminal connection, so that the tester has no current input cursor, when the cursor at Y, press the start button to save. When the cursor is not in Y, press the start button without saving. 5. 0.05a Calibration: Put a+ and the positive of an adjustable power supply connected together, and string into the multimeter current, when the cursor on the numbers in front of "P", uses plus or minus keys to change the value of P, can be changed the current size. Then move the cursor to in front of "a", so that the vaule in front of "a" is the same with and multimeter and readings. Then you can then save or not save. 6. Then 0.1a, 0.3a, 1a, 3a calibration, calibration with 0.05a. 3a current needs continuous 20 seconds or more to recalibration, to reduce the influence of temperature drift. After completed, will automatically enter boot interface, it can be used now. Note: the first calibration please save every step. When not saving option is for convenient use later when you want to change one or two calibration point, the other is up to your choose, accelerate the speed of calibration. If you frequently use two or more current, high current calibration step Please keep large current 2 minutes or more and then uses multimeter calibrated to reduce drift. 1. Plug micro usb cable to the computer Software Operation 2. Buyers can also use their own usb to serial cable. Connect the usb to serial cable to the 4 pin holes on the discharge. Pin needs your own preparation, and the soldering or directly soldering the serial cable to four holes. FIG.1 5V, GND power supply, TXD, RXD line is online line. Picture two orange line is a two-wire connection, four-wire connection is not required to connected. Serial port 5V and micro usb 5V power supply only need to take one of them.
3. To find the serial number: Install the serial plate driver (pl2303 driver), according to the wiring diagram and connect the serial ports board and tester. Right-click the "Computer" or "My Computer" icon on your desktop, select "Device Manager" on right-click menu, find the port, search com number (need to with the word "Prolific"), the discharge device of computer software, select the com number. Inside the device manager with a yellow exclamation com number means the driver is not installed, please install the driver. 4. Open the discharge instrument PC software, (need only one PC program,) compressed package drawer.exe. It can run directly. If you can not run, you can run the "eload_u15.bat" on the package "eload_u15.rar". There are so many files inside just to established software environment.
The left corner is the serial port Open button. Select the appropriate com port, click next to "open the serial port"( 打开串口 ) port opens. Button becomes "Close the serial port"( 关闭串口 ). After open the serial port, if the battery is connected, the upper left corner of the red digital voltmeter will shows battery voltage. The software will automatically generate "data.ini" file. Store the opening serial port, voltage and current settings. 5. Discharging operation: In the top left of the set voltage, fill in the discharge current, cutoff voltage. The unit is volts, amps, can only have two decimals, voltage 0-15v, current 0.1-3a. Press the "discharge" button to start the discharge. "Discharge" button becomes a pause button. 6. Curve drawing: X axis is time, y axis is the voltage, during discharge will draw a point every 5 seconds. If more than one hours, x-axis coordinate interval becomes large, possibly every 30 seconds, 1 minute to draw a point. Curves color is red.
6. "discharge" button below the text box, display discharge time, equivalent resistance. The following text box of "Save Waveform" to display every second voltage and current, but also save waveform saved content. Pause button means discharge pause, but battery capacity, discharge time is also maintained. Stop means the discharge stop, and battery capacity, discharge time will be cleared. 7. After the end of the discharge, will pop up the dialog box of discharge is finish. For the next discharge, press the stop button once again. 8. You can fill the box on the left of the constant current button, constant current range is 0.1-3a. Click and entering the constant current mode. 9. You can fill current size on the left of the internal resistance button. Each click of the button, the instrument will generate a specified size pulse current, on this basis the internal calculate resistance of the battery 10. Save Waveform: Press the "Save Waveform"( 保存波形 ) button will save the discharge time, voltage and current into a txt file. Press "read waveform" ( 读取波形 ) can open previously saved waveform files, and plotted curve.