34410A/11A/L4411A Service Guide 93
Calibration Procedures 3
Flatness Adjustments
The instrument stores new flatness correction constants each time this
procedure is followed. Flatness constants adjust the DMM for AC Volts
and AC current measurements across the usable input frequency band.
The flatness constant is computed from the calibration value entered for
the calibration command and from measurements made automatically
during the adjustment procedure.
Adjustments for each ranges and frequency should be performed ONLY in
the order shown.
Flatness Adjustment Considerations
• The ADC and zero adjustment procedure must have been recently
performed prior to beginning any gain adjustment procedures.
• Flatness adjustments can be made using either the front or the rear
input terminals. Make sure the Front/Rear selection switch matches the
terminals being used.
Valid Flatness Adjustment Input Values
Refer to the table on page page 83.
Never turn off the instrument during a Flatness Adjustment. This may cause calibration
memory for the present function to be lost.
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