Gain and Flatness Calibration Adjustment Overview
The instrument stores new flatness correction constants each time this procedure is followed. Flatness con-
stants 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 computed
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.
Keysight True
volt
Series Operating and Service Guide
529
Calibration Adjustment Procedures
