How t GVDA GD128PLUS 9999 Counts Rechargeable Smart Multimeter with Bracket
1.Self-calibration
Press and hold the HOLD button to power on, wait for the full display to be completed, release it, and then short-press the HOLD button three times to enter the calibration mode. At this time, the LCD displays CAL (the first calibration will flash), and then displays the completion %. When the calibration is completed, PAS and Beep will be displayed. A beep indicates that the self-calibration is completed and 100mV calibration is entered.
Note: When performing self-calibration, the test leads must be left floating and cannot be connected to any signal.
2.100mV DC voltage calibration (must be calibrated, can be selected by pressing the SEL key)
In self-calibration mode, press the SEL key to exit self-calibration and enter 100mV calibration. The LCD displays the mV value (the first calibration will flash). At this time, an external input is 100mV. Press the HOLD button once. The LCD will display PAS and a Beep sound will appear in about 2 seconds, indicating 100mV. Calibration is completed and the voltage measurement is displayed.
3.100K resistance calibration (select calibration as needed, press SEL key to select):
Press the SEL key again, and the LCD will display the resistance value (the first calibration will flash). At this time, the external input is 100K. Press the HOLD button once. The LCD will display PAS and Beep for about 1 second, indicating that the 100K calibration is completed, and the resistance measurement value will be displayed.
4. Ambient temperature calibration (must be calibrated, can be selected by pressing SEL):
Press the SEL key again, the LCD will display 25.0℃ (the first calibration will flash), adjust according to the current indoor temperature through the SEL key, short press to decrease by 0.5℃, long press and continuously press to increase by 0.5℃, after the adjustment is completed, press the HOLD button once, 1 In about seconds, the LCD displays PAS and beeps, indicating that the ambient temperature calibration is completed, and the ambient temperature measurement value is displayed.
Note: During calibration, the test leads must be left floating and cannot be connected to any signal.
5.100mA current calibration (must be calibrated):
In self-calibration mode, insert the test leads into the mA current jack, and the LCD will display the current value (it will flash for the first calibration). At this time, input DC 100mA externally. Press the HOLD button once. The LCD will display PAS and a Beep sound will appear in about 1 second, indicating that the current calibration is completed. , and displays the current measurement value.
6.1A current calibration (must be calibrated):
In the self-calibration mode, insert the test leads into the A current jack, and the LCD will display the current value (the first calibration will flash). At this time, input DC 1A externally, press the HOLD button once, and the LCD will display PAS and a Beep sound for about 1 second, indicating that the current calibration is completed. , and displays the current measurement value.
7. After the calibration is completed, press and hold the Power button to turn off the device.
Calibration error code:
Er1: Calibration data writing error, usually an external hardware problem;
Er2: Calibration data is written incorrectly, the capacitance value of the VPP pin is incorrect or there is a binding or welding problem;
Er3: The number of calibrations has been exhausted, each calibration point can be calibrated up to 16 times;
ErC: Signal error, generally check the input signal strength and polarity.
