Keithley 2302 Instruction Manual page 141

Example 4. Measure current on both channels using channel 2
Model 2306-VS configuration using channel 2 for current measurements on both channels:
*RST
:VOLT 3
:CURR 1.75
:SENS:FUNC 'CURR'
:TRIG:EXT:BOTH NONE
:TRIG:EXT:STEP:READ AUTO
:TRIG:EXT:STEP:VOLT OFF
:TRIG:EXT:STEP:POIN 5
:SOUR2:VOLT 2
:SOUR2:CURR 1.25
:SENS2:FUNC 'CURR'
:TRIG2:EXT:BOTH AUTO
:TRIG2:EXT:STEP:READ AUTO
:TRIG2:EXT:STEP:VOLT OFF
:TRIG2:EXT:STEP:POIN 5
Loop1:
:BOTHTRIGEXT TWOON
monitor for the trigger out pulse on channel 2
Loop 2:
generate 5 trigger in pulses on channel 2 and detect trigger out pulses -
make sure a new trigger in pulse occurs after each trigger out pulse. Trigger
in pulses are ignored until the trigger out pulses. Trigger ins detected on
falling edge and trigger outs pulse low for about 10us.
:FETCH:ARR?
:FETCH2:ARR?
:TRIG2:EXT:ENAB:INIT
go to Loop 2
:BOTHTRIGEXT TWOOFF
go back to Loop 1 after making changes
NOTE
If you are unable to monitor for trigger out pulses, either:
(1) monitor the buffer full bit in the status model (Section 8), or
(2) allow sufficient time between trigger in pulses to allow the unit to complete each
step (see the specifications in Appendix A for time guidelines).
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External Triggering (Model 2306-VS Only)
' reset the 2306-VS
' set the voltage
' set the current limit
' select the current functionality
' select none for both on channel 1
' take measurements
' disable voltage stepping
' take 5 measurements
' set the voltage
' set the current limit
' select the current functionality
' select auto measurements for both on chan. 2
' take auto measurements
' disable voltage stepping
' take 5 measurements
' enable both functionality on channel 2
' read channel 1 measurements
' read channel 2 measurements
' init for a new set of measurements on each
' channel
' turn off both functionality when down or for
' changes
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