Keithley 2750 User Manual page 80

Model 2750 Multimeter/Switch System User's Manual
Test procedure:
NOTES The following test procedure assumes a Model 7700 switching module installed
1.
2.
3.
4.
5.
6.
in slot 1 of the mainframe.
The procedure assumes that the instrument is operating in the continuous mea-
surement (triggering) mode (see
Do not use the following procedure to perform thermocouple temperature
measurements with the INTernal or EXTernal reference junction selected. The
SIMulated reference junction will instead be used resulting in invalid readings.
The "ERR" annunciator will turn on to indicate that the integrity of the
temperature reading is questionable.
Open all channels. For most switching modules, channels remain closed after the
Model 2750 is turned off. Therefore, it is good, safe practice to open all channels at
the start and end of the test.
Front panel operation: Press OPEN > Display ALL > Press OPEN
Remote programming:
Close channels 23 and 25.
Front panel operation: Press CLOSE > Select MULTI > Key in 123 >
Remote programming:
Close channels 1 and 11 to connect DUT #1 to the DMM and bias supply.
Front panel operation: Press CLOSE > Select MULTI > Key in 101 >
Remote programming:
Measure DUT #1.
Front panel operation: Take reading from display
Remote programming:
Open channels 1 and 11.
Front panel operation: Press OPEN > Select MULTI > Key in 101 >
Remote programming:
Modify steps 3, 4, and 5 to test DUT #2. That is, close channels 2 and 12, measure
DUT #2, and then open channels 2 and 12.
Close/Open Switching Module Channels
"Defaults and user setups," page
ROUT:OPEN:ALL
Press ENTER
Press CLOSE > Select MULTI > Key in 125 >
Press ENTER
ROUT:MULT:CLOS (@123,125)
Press ENTER
Press CLOSE > Select MULTI > Key in 111 >
Press ENTER
ROUT:MULT:CLOS (@101,111)
DATA?
Press ENTER
Press OPEN > Select MULTI > Key in 111 >
Press ENTER
ROUT:MULT:OPEN (@101,111)
2-25
1-19).