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Model 2750 Multimeter/Switch System Service Manual Routine Maintenance 3-9

Routine Maintenance

Resetting relay closure count

NOTE The Model 2750 must be in the manufacturing calibration mode to reset the clo-

sure count. To do so, press and hold the OPEN key while turning on the power,

then send the :CAL:PROT:CODE “code” to unlock calibration (default code:

KI002750). After resetting relay counts, send :CAL:PROT:LOCK to lock out

calibration.

To reset the relay closure count of specific channels to 0, send this command via remote:

:ROUTe:CLOSe:RCOunt (@clist)

Again clist is the summary of channels to be reset. For example, the following command

resets channels 2 and 7 of a module in slot 1 to 0:

:ROUT:CLOS:RCO (@102,107)

The following command resets the count of slot 1 module channels 1 through 10:

:ROUT:CLOS:RCO (@101:110)

Setting count update interval

Relay closure counts are updated in temporary RAM every time a channel is closed

regardless of how it was closed: by an SCPI command, front panel control, or during a

scan. These counts are permanently written to the EEPROM on the card only at a user-set-

table time interval (which has a factory default of 15 minutes), or whenever the counts are

queried. Valid intervals (set in integer number of minutes) are between 10 and 1440 min-

utes (24 hrs). 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.

The lower the interval, the less chance there is of losing relay counts due to power failures.

However, writing to the EEPROM more often may reduce scanning throughput. The

higher the interval, the less scanning throughput is reduced, but more relay counts may be

lost in the event of a power failure.

To set the count update interval, send this command:

:ROUTe:CLOSe:COUNt:INTerval <interval>

For example, to set the interval to 30 minutes, send this command:

:ROUT:CLOS:COUN:INT 30

Keithley 2750 Service Manual

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