GW Instek GDM-8245 - Page 59

Calibration
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10. Check the DMM display. If the voltage is within the
specification range, go to the next adjustment range. If
not, adjust variable capacitor VC302 until the voltage is
within specification.
Range: 49V±10 digits
11. Press Up to set the DMM range to 500V.
12. Input 490V/1kHz.
13. Check the DMM display. If the voltage is within the
specification range, go to the next adjustment range. If
not, adjust variable capacitor VC303 until the voltage is
within specification.
Range: 490V±10 digits
14. Press Up to set the DMM range to 1kV.
15. Input 1kV/1kHz.
16. Check the DMM display. Range: 1kV±20 digits
Note
There is no adjustment procedure for the GDM-8245
for the 1kV range. If the voltage is not within
specification at 1kHz, a lower frequency (50Hz) can be
used to downward calibrate the DMM. After the
downward calibration, the 1kHz frequency can then be
tested again.
Calibrating the frequency response is complete.