3Operating and Programming

Relay Cycle Count

Usage:

L4421A 40- Channel Armature Multiplexer

L4433A Dual/Quad 4x8 Reed Matrix

L4437A General Purpose Switch

L4445A Microwave Switch/Attenuator

The number of relay cycles can be determined to help you predict relay end- of- life. The instrument counts the cycles on each relay and stores the total count in non- volatile memory.

In addition to the channel relays, you can also query the count on the Analog Bus relays and bank relays.

You can reset the cycle count on any of the channel relays, Analog Bus relays, or bank relays but the instrument must be unsecured. See Chapter 11 for information on unsecuring the instrument.

The following command is used to read the cycle count on the specified instrument channel(s):

DIAG:RELAY:CYCLES? (@<ch_list>)

The following command is used to reset the cycle count on the specified instrument channel(s):

DIAG:RELAY:CYCLES:CLEAR (@<ch_list>)

Calibration Overview

Usage:

L4451A 4- Channel Isolated D/A Converter

L4452A Multifunction Module

The L4400 series instruments requiring calibration are the L4451A and the L4452A. Calibration procedures for these instruments are contained in Chapter 11.

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L4400 User’s Guide

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Agilent Technologies L4400 manual Relay Cycle Count, Calibration Overview