Relay Closure Count - Keithley 2750 User Manual

Model 2750 Multimeter/Switch System User's Manual

Relay closure count

The Model 2750 keeps an internal count of the number of times each module relay has
been closed. The total number of relay closures are stored in EEPROM on the card. This
count will help you determine if and when any relays require replacement (see module
contact life specifications).
Relay closures are counted only when a relay cycles from open to closed state. If you send
multiple close commands to the same channel without sending an open command, only
the first closure will be counted.
Relay closure count can only be read via remote operation. The commands are summa-
rized in
Table 2-3
Relay closure count commands
ROUTe:CLOSe:COUNt? <clist>
ROUTe:CLOSe:COUNt:INTerval <NRf> Set count update interval in minutes
ROUTe:CLOSe:COUNt:INTerval?
Channel list parameter:
<clist> = (@SCH)
where: S
Examples:
Note: Relay count interval set to 15 minutes at the factory. SYSTem:PREset and *RST have no effect on the
NOTE
Table 2-3. Details follow the table.
Commands
= Mainframe slot number (1, 2, 3, 4 or 5)
CH = Switching module channel number (must be 2 digits)
(@101) = Slot 1, Channel 1
(@101, 203) = Slot 1, Channel 1 and Slot 2, Channel 3
(@101:110) = Slot 1, Channels 1 through 10
set interval.
The relay closure count can be reset to zero. For details, see Model 2750 Service
Manual, "Plug-in module relay closure count."
Close/Open Switching Module Channels
Description
Query close count for specified
channels.
(10 to 1440).
Query relay count update interval.
2-31
Default
Note