GW Instek GDM-8245 - Page 57

Calibration
57
Caution
The following service procedure involves the use of high
voltages. Ensure proper precautions and correct safety
measures are adhered to.
Verification
procedure
1. Enter CL50 Calibration mode.
2. Set the DMM mode to AC mV. Press Shift + ACV.
3. Input 200mV/50Hz to the DMM.
4. Check the DMM display. If the voltage is within
specification range, go to the next calibration range.
Range: 200mV±4 digits
5. Press Auto/Man to re-calibrate the range. Press
Auto/Man again to save when the calibration has
settled.
6. Enter AC+DC mode. Press the AC+DC key.
7. Check the DMM display. If the voltage is within
specification, go to the next calibration range.
Range: 200mV±4 digits
8. Press Auto/Man to re-calibrate the range. Press
Auto/Man again to save when the calibration has
settled.
9. Enter ACV 5V range. Press the ACV key.
10. Input 2V/ 50Hz.
11. Check the DMM display. If the voltage is within
specification, go to the next calibration range.
Range: 2V±4 digits
12. Press Auto/Man to re-calibrate the range. Press
Auto/Man again to save when the calibration has
settled.
13. Repeat steps 9 to 12 for the following inputs and
ranges.
Range
Input
Specification
50V
20V/50Hz
20V±4 digits
500V
200V@50Hz
200V±4 digits