Wire versus 1-wire mode – Agilent Technologies Switch/Measure User Manual

Page 39

Features and Functions

34980A User’s Guide

2-Wire Versus 1-Wire Mode

You can configure the 34923A, 34925A, and 34933A modules for 2- wire
(differential) or 1- wire (single ended) measurements. If you change the
module configuration, you must cycle power on the 34980A to activate the
new setting.

• To determine whether the module is in the 2- wire or 1- wire

configuration, check the module description shown on the front panel
when the module is selected, or send the

SYSTem:CTYPe?

SYSTem:CDEScription?

command. For example, the

SYSTem:CTYPe?

response for the 34923A will be either “34923A” (differential mode) or
“34923A- 1W” (single- ended mode).

• If you are using terminal blocks with these modules, be sure to use the

corresponding 2- wire or 1- wire terminal block.

• The module configuration is stored in non- volatile memory on the

module and does not change when you remove the module from the
mainframe, after a Factory Reset (

*RST

command), or after an

Instrument Preset (

SYSTem:PRESet

command).

Front Panel Operation:

Module (Configure) > MODE NEXT POWER-ON

After selecting the 2- wire (“WIRE2”) or 1- wire (“WIRE1”), you must cycle
power on the 34980A to activate the new setting.

Remote Interface Operation:

The following command selects the 1- wire

configuration on the module in slot 3. The new configuration will not take
effect until you cycle power on the 34980A.

SYST:MOD:WIRE:MODE WIRE1,3