Agilent Technologies L4400 manual L4421A 40-Channel Armature Multiplexer Hardware Description

4L4421A 40-Channel Armature Multiplexer

Example: Querying channels for open or close state The following command returns a 1 (true) or 0 (false) state of channel 036.

ROUTe:CLOSe (@1036)

ROUTe:CLOSe? (@1036) !Returns a 1

ROUTe:OPEN? (@1036) !Returns a 0

Example: Querying the Identity of the Instrument The following command

returns the identity of the L4421A:

SYSTem:CTYPe? 1

Querying and Clearing Cycle Count, and Resetting Modules

Example: Querying the cycle count for a relay The following command returns

the cycle count on channels 7 and 16.

DIAGnostic:RELay:CYCLes? (@1007,1016)

Example: Clearing the cycle count for a relay The following command resets the cycle count to zero on the channels 7 and 16 for a MUX module in slot 1.

DIAGnostic:RELay:CYCLes:CLEar (@1007,1016)

Example: Resetting module(s) to power-on state The following command

resets the L4421A to its power- on state.

SYSTem:CPON 1

L4421A 40-Channel Armature Multiplexer Hardware Description

The L4421A 40- Channel Armature Multiplexer is divided into two banks with

20latching armature switches (channels 1- 20 and 21- 40) in each. The instrument also offers four additional fused relays (channels 41- 44) for making AC and DC current measurements with no external shunts needed. These current channels feature “make- before- break” connections to ensure continuous current flow when switching from one current channel to another. The current fuses are replaceable. Refer to the L4400 Service Guide for specific information about these fuses.

This module also contains nine armature analog bus relays (channels 911- 914, 921- 924, and 931), four on each bank that can connect the bank relays to the system analog buses and one that connects the current relays to

104 L4400 User’s Guide