Keysight Truevolt Serie Mode D'emploi page 529

Calibration Adjustment Procedures
Gain and Flatness Calibration Adjustment Overview
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 calibration procedure.
Calibrations for each range and frequency should be performed in the order shown.
Flatness Calibration Considerations
The ADC and zero calibration adjustment procedure must have been recently performed before beginning
gain calibration. Flatness calibrations can be made using either the front or the rear input terminals. On
the 34461A/65A/70A, make sure the Front/Rear switch matches the terminals in use.
Never turn off the instrument during a gain or flatness calibration. This may cause calibration memory for the
present function to be lost.
Gain Calibration
The instrument calculates and stores gain corrections for each input value. The gain constant is com-
puted from the calibration value entered for the calibration command and from measurements made auto-
matically during the calibration procedure.
Most measurement functions and ranges have gain calibration procedures, and calibration for each func-
tion should be performed in the order shown.
530 Keysight Truevolt Series Operating and Service Guide