4 Features and Functions
142 Keysight 34970A/34972A User’s Guide
Voltage Measurement Configuration
To connect voltage sources to the module’s screw terminals, see page 39.
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 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.
– 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
100 mV 1V 10V 100V 300V Autorange
Input Resistance Setting
Input Resistance
100 mV, 1V, 10 V ranges
Input Resistance
100 V, 300 V ranges
Input R Auto OFF
Input R Auto ON
10 MΩ
> 10 GΩ
10 MΩ
10 MΩ
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