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Model 2790 SourceMeter
Setting count update interval
Relay closure counts are updated in temporary RAM every time a channel is closed, regard-
less of how it was closed: by a SCPI command, front panel control, or during a scan. These
counts are permanently written to the EEPROM on the card only at a user-settable 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 1 and 1440 minutes (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
Front panel tests
There are two front panel tests: one to test the functionality of the front panel keys and one
to test the display.
KEY test
The KEY test allows you to check the functionality of each front panel key. Perform the
following steps to run the KEY test:
1.
2.
3.
4.
®
Switch System Reference Manual
Press SHIFT and then TEST to access the self-test options.
Use the up or down RANGE key to display "TEST: KEY".
Press ENTER to start the test. When a key is pressed, the label name for that key is
displayed to indicate that it is functioning properly. When the key is released, the
message "NO KEY PRESS" is displayed.
Pressing EXIT tests the EXIT key. However, the second consecutive press of EXIT
aborts the test and returns the instrument to normal operation.
18-11
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