Shenzhen TestPad Electronic Co., Ltd. http://www.test-pad.com
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Warning: The tester shall be calibrated by the qualified electronic engineering technicians or the
electronic engineers with rich experience in instrument calibration, otherwise improper calibration
may severely degrade the measurement accuracy of the tester or result in the malfunction of the
tester.
To ensure accurate measurement, it is necessary to calibrate the tester after the initial assembly or
a long-time use of it.
The following parameters of the tester can be calibrated:
1. Battery measurement It is related to the measurement accuracy of battery
voltage.
2. Charge current measurement It is related to the setting accuracy of charge current.
3. Discharge current measurement It is related to the measurement accuracy of discharge
current and battery capacity.
4. High-current grade measurement It is related to the measurement accuracy of battery
over-current protection current.
5. Impedance measurement multiplying factor It is related to the measurement accuracy of battery
impedance.
6. Impedance measurement offset When this parameter is used for impedance test, it
corrects the impedance error of the correction line.
Required components and materials:
1. A power source with an output current of higher than 3.5A is required for the calibration of
voltage and discharge current grade. For example, use a DC stabilized power source of higher
than 5V/4A. If such source is not available, use a fully charged Li-ion battery with a capacity
of higher than 2AH, for example, an ordinary 18650 columned Li-ion battery.
2. A discharge load is required for the calibration of discharge current. For example, use a DC
electronic load, and adjust it to the constant-current (1.5A) mode. If such load is not available,
use a high-power resistor of 3Ω/20W.
3. A high-precision resistor with a resistance of 100~200mΩ is required for the calibration of
impedance. Use a high-precision digital bridge to measure the impedance of the resistor (in
the 1KHz AC measurement mode).
4. A high-precision digital multimeter is required to be the reference instrument for the
calibration of current and voltage. It is recommended to use a Fluke 187 high-precision digital
multimeter or a digital multimeter with a higher precision. An ordinary digital multimeter,
though acceptable, will cause some deviation in the calibration.
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