Voltage Measurement Configuration; Dc Input Resistance - Agilent Technologies 34980A User Manual

2
Features and Functions

Voltage Measurement Configuration

This section contains information to help you configure the instrument for
making voltage measurements. The instrument can measure dc and true
RMS ac- coupled voltages on the measurement ranges shown below.

DC Input Resistance

Normally, the instrument's input resistance is fixed at 10 M
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
Applies to dc voltage measurements only.
DC input resistance
Input Resistance Setting
Input Resistance: Auto OFF
Input Resistance: Auto ON
• The
• The instrument selects 10 M
Front Panel Operation: DMM or Channel (Configure) > INPUT RESISTANCE
Remote Interface Operation: You can enable or disable the automatic
input resistance mode on the specified channels or the internal DMM.
With AUTO OFF (default), the input resistance is fixed at 10 M
ranges. With AUTO ON, the input resistance is set to >10 G
lowest dc voltage ranges.
If you omit the optional <ch_list> parameter, the command applies to the
internal DMM.
36
100 mV 1 V
for the 100 mVdc, 1 Vdc, and 10 Vdc ranges.
and
CONFigure
(fixed at 10 M for all ranges).
ranges) after a Factory Reset (
( command) or Card Reset (
SYSTem:PRESet
does not change the input resistance setting.
[SENSe:]<function>:IMPedance:AUTO {OFF|ON} [,(@<ch_list>)]
10 V 100 V
Input Resistance for:
100 mV, 1 V, 10 V ranges
10 M
> 10 G
commands automatically select AUTO OFF
MEASure?
(fixed input resistance on all dc voltage
command). An Instrument Preset
*RST
300 V Autorange
for all
Input Resistance for:
100 V, 300 V ranges
10 M
10 M
command)
SYSTem:CPON
for the three
34980A User's Guide
for all