User`s guide

133

Chapter 4 Features and Functions

Current Measurement Configuration

To connect a current source to the module’s screw terminals, see page 28.

This section contains information to help you configure the instrument

for making current measurements on the 34901A multiplexer module.

This module has two fused channels for direct DC and AC current

measurements on the measurement ranges shown below.

Note: Current measurements are allowed only on channels 21 and 22 on

the 34901A module.

AC Low Frequency Filter

The instrument uses three different AC filters which enable you to either

optimize low frequency accuracy or achieve faster AC settling times. The

instrument selects the slow, medium, or fast filter based on the input

frequency that you specify for the selected channels.

Applies to AC current and AC voltage measurements only.

• The instrument selects the medium filter (20 Hz) when the 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 setting.

10 mA 100 mA 1 A Autorange

Input Frequency Default Settling Delay Minimum Settling Delay

3 Hz to 300 kHz (Slow)

20Hz to 300 KHz (Medium)

200 Hz to 300 kHz (Fast)

7 seconds / reading

1 second / reading

0.12 seconds / reading

1.5 seconds

0.2 seconds

0.02 seconds

34970A Refresh UG.book Page 133 Wednesday, February 17, 2010 12:34 PM