Calibration Procedures 4
Keysight 34970A/34972A Service Guide 93
6 Use the knob, and to set the number in the display to the sum of the
calibrator output and the measured offset (from step 3) and press . For
example, if the calibrator output is 10.001 volts and the measured offset is 10
µV, enter +10.001010 volts. When the adjustment finishes, verify that new
readings fall within ± 20 µV of the calibrator output plus the offset.
7 Reverse the cable connections to the calibrator to create a -10 VDC voltage
standard. You must physically reverse the cables. DO NOT switch the output
polarity of the calibrator.
8 Perform a –10V DC gain calibration. Press
to enter the calibration
menu. Press
again to begin the adjustment procedure. Be sure to allow
time for thermal offsets to stabilize (usually about 1 minute).
9 Use the knob, and to set the number in the display to the difference of
the calibrator output and the measured offset (from step 3) and press .
Using the previous example values, enter 10 µV minus 10.001 volts or
–10.000990 volts.
10 When the adjustment finishes, verify that new readings fall within ± 30 µV of
the calibrator output minus the offset.
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