Dc Input Resistance - HP 34401A User Manual

Chapter 3 Features and Functions
Measurement Configuration

DC Input Resistance

Normally, the multimeter's input resistance is fixed at 10 M for all
dc voltage ranges to minimize noise pickup. To reduce the effects of
measurement loading errors, you can set the input resistance to greater
than 10 G for the 100 mVdc, 1 Vdc, and 10 Vdc ranges.
Applies to dc voltage measurements and is disabled for all other functions.
Fixed Resistance ON (default)
Fixed Resistance OFF
The input resistance setting is stored in volatile memory; the
multimeter selects 10 M (for all dc voltage ranges) when power
has been off or after a remote interface reset.
Front-Panel Operation: Select from the menu the 10 M mode (fixed
resistance for all dc voltage ranges) or the >10 G mode. The default
is 10 M .
3: INPUT R (MEAS MENU)
Remote Interface Operation: You can enable or disable the automatic
input resistance mode. With
is fixed at 10 M for all ranges. With
is set to >10 G for the three lowest dc voltage ranges. The CONFigure
and MEASure? commands automatically turn
INPut:IMPedance:AUTO {OFF|ON}
Input Resistance
100mV, 1V, 10V ranges
10 M
> 10 G
(default), the input resistance
AUTO OFF
, the input resistance
AUTO ON
AUTO OFF
Input Resistance
100V, 1000V ranges
3
10 M
10 M
.
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