Voltage Measurement Configuration
To connect voltage sources to the module ’s screw terminals, see page 21.
This section contains information to help you configure the instrument
for making voltage measurements. The instrument c an measure dc and
true RMS ac-coupled voltages on the measurement ranges shown below.
100 mV 1 V 10 V 100 V 300 V Autorange

DC Input Resistance

Normally, the instrument’s input resistance is fixed at 10 MΩ 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 GΩ for the 100 mVdc, 1 Vdc, and 10 Vdc ranges.
Applies to dc voltage measurements only.
Input Resistance
Setting Input Resistance
100 mV, 1 V, 10 V ranges Input Resistance
100 V, 300 V ranges
Input R Auto OFF
Input R Auto ON 10 M
Ω
> 10 GΩ 10 MΩ
10 MΩ
•The instrument selects 10 MΩ (fixed input resistance on all
dc voltage ranges) when the measurement function is changed or
after a Factory Reset (*RST command). An Instrument Preset
(SYSTem:PRESet command) or Card Reset (SYSTem:CPON command)
does not change the input resistance setting.
•Front-Panel Operation: First, select the dc voltage function on the
active channel. Then, go to the Advanced menu and select 10 MΩ
(fixed resistance for all dc voltage ranges) or >10 GΩ. The default
is 10 MΩ.
INPUT R >10 G
4
Chapter 4 Features and Functions
Voltage Measurement Configuration
113