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98 L4400 User’s Guide
3 Operating 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.