C: Status model Model 2450 Interactive SourceMeter® Instrument
C-24 2450-901-01 Rev. B/September 2013
SRQ when a measurement completes
This example shows you how to generate an SRQ when a measurement completes. This is most
useful when you have a measurement that will take a long time to complete and you wish to free up
the controlling computer to do other things while it is waiting. This can happen if you have configured
the measurement with a long delay value, a large aperture, or have enabled filtering.
This code configures the SMU for a long reading, and then configures the trigger model to generate
notify events before and after the measurement. The status model is then configured to generate an
SRQ based on the "Measurement Done" notify event. The output is turned on and the trigger model is
used to take the measurement. When the measurement completes, the instrument generates an
SRQ and returns the data.
Using SCPI commands:
*RST
TRAC:CLE
SOUR:VOLT:RANG 1
SOUR:VOLT 1
SOUR:VOLT:ILIM 10e-3
SENS:CURR:RANG 10e-3
SENS:NPLC 10
TRIG:BLOC:LOG:EVEN 1, INFO1, "Measurement Started."
TRIG:BLOC:MEAS 2, "defbuffer1"
TRIG:BLOC:LOG:EVEN 3, INFO2, "Measurement Done."
STAT:CLE
STAT:OPER:MAP 0, 2735, 2734
STAT:OPER:ENAB 1
*SRE 128
OUTP ON
INIT
*WAI
OUTP OFF
TRAC:DATA? 1, 1, "defbuffer1", READ
Using TSP commands:
reset()
-- Clear the reading buffer
defbuffer1.clear()
-- Configure the source and take a measurement
smu.source.range = 1
smu.source.level = 1
smu.source.ilimit.level = 10e-3
smu.measure.range = 10e-3
-- Setup the NPLC for a really long measurement
smu.measure.nplc = 10
-- Use the trigger model to create events before and after
-- the measurement to generate SRQ when measurement is done.
trigger.model.setblock(1, trigger.BLOCK_LOG_EVENT, trigger.LOG_INFO1, "Measurement
Started.")
trigger.model.setblock(2, trigger.BLOCK_MEASURE, defbuffer1)
trigger.model.setblock(3, trigger.BLOCK_LOG_EVENT, trigger.LOG_INFO2, "Measurement
Done.")
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