Agilent Technologies 34401A - Manual (Page 59)

DC Input Resistance
Normally, the multimeter’s input resistance is fixed at 10 M Ω 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
Ω for the 100 mVdc, 1 Vdc, and 10 Vdc ranges.
Applies to dc voltage measurements and is disabled for all other functions.
• The input resistance setting is stored in volatile memory; the
multimeter selects 10 M
Ω (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 Ω mode (fixed
resistance for all dc voltage ranges) or the >10 G Ω mode. The default
is 10 M Ω .
3: INPUT R (MEAS MENU)
• Remote Interface Operation: You can enable or disable the automatic
input resistance mode. With
AUTO OFF (default), the input resistance
is fixed at 10 M Ω for all ranges. With AUTO ON , the input resistance
is set to >10 G Ω for the three lowest dc voltage ranges. The CONFigure
and MEASure? commands automatically turn AUTO OFF .
INPut:IMPedance:AUTO {OFF|ON}
Input Resistance Input Resistance
100mV, 1V, 10V ranges 100V, 1000V ranges
Fixed Resistance ON (default) 10 M
Ω
10 M
Ω
Fixed Resistance OFF > 10 G
Ω
10 M
Ω
3
Chapter 3 Features and Functions
Measurement Configuration
53