Voltage Measurement Configuration - Agilent Technologies 34972A User Manual

Chapter 4 Features and Functions

Voltage Measurement Configuration

Voltage Measurement Configuration

To connect voltage sources to the module's screw terminals, see page 28.
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.
100 mV 1V
DC Input Resistance
Normally, the instrument'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 only.
Input Resistance
Setting
Input R Auto OFF
Input R Auto ON
• The instrument selects 10 M (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 M
(fixed resistance for all DC voltage ranges) or >10 G. The default is
10 M
INPUT R >10 G
130
10V 100V 300V
Input Resistance
100 mV, 1V, 10 V ranges
10 M
> 10 G
Autorange
Input Resistance
100 V, 300 V ranges
10 M
10 M