Keithley 2750 User Manual

Model 2750 Multimeter/Switch System User’s Manual Close/Open Switching Module Channels 2-31
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. Details follow the table.
NOTE The relay closure count can be reset to zero. For details, see Model 2750 Service
Manual, “Plug-in module relay closure count.”
Table 2-3
Relay closure count commands
Commands Description Default
ROUTe:CLOSe:COUNt? <clist> Query close count for specified
channels.
ROUTe:CLOSe:COUNt:INTerval <NRf> Set count update interval in minutes
(10 to 1440).
Note
ROUTe:CLOSe:COUNt:INTerval? Query relay count update interval.
Channel list parameter:
<clist> = (@SCH)
where: S = Mainframe slot number (1, 2, 3, 4 or 5)
CH = Switching module channel number (must be 2 digits)
Examples: (@101) = Slot 1, Channel 1
(@101, 203) = Slot 1, Channel 1 and Slot 2, Channel 3
(@101:110) = Slot 1, Channels 1 through 10
Note: Relay count interval set to 15 minutes at the factory. SYSTem:PREset and *RST have no effect on the
set interval.
2750-900-01.book Page 31 Wednesday, August 3, 2011 7:56 AM

Keithley 2750 Specifications

General

Brand	Keithley
Model	2750
Category	Switch
Language	English