Gain Adjustments
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 automatically during the
adjustment procedure.
Most measurement functions and ranges have gain adjustment procedures, and adjustments for each function should
be performed in the order shown.
Gain Adjustment Considerations
The ADC and zero adjustment procedure must have been recently performed before beginning gain adjustment. Gain
adjustments can be made using either the front or rear input (34461A only) terminals. On the 34461A, make sure the
Front/Rear switch matches the terminals in use.
Never turn off the instrument during a gain or flatness adjustment. This may cause calibration memory
for the present function to be lost.
Valid Gain and Flatness Adjustment Input Values
Gain adjustment can be accomplished using the following input values.
Function Range Valid Amplitude Input Values
DC Volts 100 mV to 100 V 0.9 to 1.1 x Full Scale
1000 V 450 to 500 V
DC Current 100 µA to 1 A 0.9 to 1.1 x Full Scale
3 A 1.8 to 2.2 A
Ohms (2W and 4W) 100 Ω to 100 MΩ 0.9 to 1.1 x Full Scale
Frequency Any Input > 100 mV rms, 9.9 kHz to 110 kHz
AC Current (rms)
[1]
100 µA to 1 A 0.9 to 1.1 x Full Scale
3 A 1.8 to 2.2 A
AC Volts (rms)
[1]
100 mV to 100 V
[2]
0.9 to 1.1 x Full Scale
750 V 400 to 750 V
[1]
Valid frequencies are nominal frequencies ±1%.
[2]
100 VAC flatness adjustment performed at 50 V ±10%.
Agilent Truevolt Series DMM Operating and Service Guide 333
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