Keithley 2302, Instruction Manual

Page: 96 / 348

3-34 Pulse Current Measurements
Continuous pulse train
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 Figure 3-9 in
a continuous pulse train. The step duration is 600
μ
sec with a step period of 2 seconds.
DISP:CHAN 1 ‘ Set active channel - battery.
SENS:CURR:RANG 5 ‘ Select 5A current range.
SENS:PCUR:STEP ON ‘ Enable step.
SENS:FUNC ’PCUR’ ‘ Select PCUR function.
SENS:PCUR:STEP:UP 4 ‘ Specify 4 up steps.
SENS:PCUR:STEP:DOWN 0 ‘ Specify 0 down steps.
SENS:PCUR:STEP:RANGE .75 ‘ Specify 1 amp range.
SENS:PCUR:STEP:TIME 100e-6 ‘ Specify 100 microseconds for step
‘ integration time.
SENS:PCUR:STEP:DEL 50e-6 ‘ Specific 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).
SENS:PCUR:STEP:TOUT 3e-3 ‘ Specify 3 milliseconds for step
‘ timeout except for first step. Recall
‘ timeout needs to be long enough to bypass
‘ the 600mA, 300mA, and 100mA steps, but not
‘ so short it misses the 450mA step (600
μ
sec x
‘ 3 = 1.8 msec). Using 3msec accounts for the
‘ first step spare time as well.
SENS:PCUR:STEP:TOUT:INIT 3 ‘ Specify 3 seconds for first step timeout.
‘ Recall for continuous pulse measurement,
‘ need to have an initial step timeout long
‘ enough to bypass the pulse period.
SENS:PCUR:STEP:TLEV1 750e-3 ‘ Step 1 tlev value.
SENS:PCUR:STEP:TLEV2 400e-3 ‘ Step 2 tlev value.
SENS:PCUR:STEP:TLEV3 500e-3 ‘ Step 3 tlev value.
SENS:PCUR:STEP:TLEV4 625e-3 ‘ Step 4 tlev value.
READ:ARR? ‘ Trigger and return the 4 step measurements.
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