Keithley 2302 Instruction Manual page 95

One-shot pulse
NOTE
For the Model 2306-PJ to function correctly, the current range must be selected
before selecting the trigger level range.
The following command sequence measures pulses similar to the one shown in
with a one-shot pulse measurement. The step duration is 600μsec with 4msec between steps.
DISP:CHAN 1
SENS:PCUR:STEP ON
SENS:FUNC 'PCUR'
SENS:PCUR:STEP:UP 6
SENS:PCUR:STEP:DOWN 0
SENS:CURR:RANG 5
SENS:PCUR:STEP:RANGE .75
SENS:PCUR:STEP:TIME 100e-6
SENS:PCUR:STEP:DEL 50e-6
SENS:PCUR:STEP:TOUT 8e-3
SENS:PCUR:STEP:TOUT:INIT 60
' Using the same step trigger level for all steps is contained in the
' following sample.
' trigger level (as shown) and also with unique trigger levels for each
' step.
SENS:PCUR:STEP:TLEV1 200e-3
SENS:PCUR:STEP:TLEV2 200e-3
SENS:PCUR:STEP:TLEV3 200e-3
SENS:PCUR:STEP:TLEV4 200e-3
SENS:PCUR:STEP:TLEV5 200e-3
SENS:PCUR:STEP:TLEV6 200e-3
READ:ARR?
' After sending this command, wait a few seconds before generating a one
' shot pulse sequence.
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' Set active channel - battery.
' Enable step.
' Select PCUR function.
' Specify 6 up steps.
' Specify 0 down steps (remember the default
' is 1). See "Pulse sequences – rising and
' falling" on page 3-26 for more information.
' Select 5A current range.
' Specify 1 amp range.
' Specify 100 microseconds for step integra-
' tion time.
' Specify 50 microseconds for step delay.
' Recall 400 microseconds needed for complet-
' ing previous step measurement and being
' ready for next. With 600 microseconds of
' step duration, we have 50 microseconds to
' spare:
' 600 (step duration) - 400 (step processing
' time) - 100 (step integration time) -
' 50(step delay) = 50 (spare time).
' Specify 8 milliseconds for step timeout ex-
' cept first one.
' Specify 60 seconds for first step timeout.
' Recall for one shot pulse measurement, need
' to have a long initial step timeout since
' want to trigger the 2306 for pulse step mea-
' surement and wait between 3 to 5 seconds be
' fore generating the one shot pulse to guar-
' antee the Model 2306 is waiting for
' detection of first step.
Table 3-5
contains a sample with the one
' Step 1 TLEV value.
' Step 2 TLEV value.
' Step 3 TLEV value.
' Step 4 TLEV value.
' Step 5 TLEV value.
' Step 6 TLEV value.
' Trigger and return the 6 step measurements
Pulse Current Measurements
Figure 3-8
3-33