4. Input 9V from the external DC power supply. The ADC value should be 14900±300,
then press the Next point softkey to calibrate the second point.
5. Supply 0V from the external DC power supply. The AD value should be 7900±300,
then press the Next point softkey to calibrate the third point.
6. Input -9Vdc from the external DC power supply. The AD value should be 1000±300,
then press the Next point softkey.
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