External Triggering (Model 2306-VS Only) 6-19
Example 4. Measure current on both channels using channel 2
Model 2306-VS configuration using channel 2 for current measurements on both channels:
*RST ‘ reset the 2306-VS
:VOLT 3 ‘ set the voltage
:CURR 1.75 ‘ set the current limit
:SENS:FUNC 'CURR' ‘ select the current functionality
:TRIG:EXT:BOTH NONE ‘ select none for both on channel 1
:TRIG:EXT:STEP:READ AUTO ‘ take measurements
:TRIG:EXT:STEP:VOLT OFF ‘ disable voltage stepping
:TRIG:EXT:STEP:POIN 5 ‘ take 5 measurements
:SOUR2:VOLT 2 ‘ set the voltage
:SOUR2:CURR 1.25 ‘ set the current limit
:SENS2:FUNC 'CURR' ‘ select the current functionality
:TRIG2:EXT:BOTH AUTO ‘ select auto measurements for both on chan. 2
:TRIG2:EXT:STEP:READ AUTO ‘ take auto measurements
:TRIG2:EXT:STEP:VOLT OFF ‘ disable voltage stepping
:TRIG2:EXT:STEP:POIN 5 ‘ take 5 measurements
Loop1:
:BOTHTRIGEXT TWOON ‘ enable both functionality on channel 2
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? ‘ read channel 1 measurements
:FETCH2:ARR? ‘ read channel 2 measurements
:TRIG2:EXT:ENAB:INIT ‘ init for a new set of measurements on each
‘ channel
go to Loop 2
:BOTHTRIGEXT TWOOFF ‘ turn off both functionality when down or for
‘ changes
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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