2308-900-01 Rev. A / July 2008
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3-29
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 3: Pulse Current Measurements
‘ cept first one.
SENS:PCUR:STEP:TOUT:INIT 60
‘ 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 2308 for pulse step mea-
‘ surement and wait between 3 to 5 seconds be
‘ fore generating the one shot pulse to guar-
‘ antee the Model 2308 is waiting for
‘ detection of first step.
Using the same step trigger level for all steps is contained in the following sample.
Table 3-7
contains a sample with the one trigger level (as shown) and also with unique trigger levels for each
step.
SENS:PCUR:STEP:TLEV1 200e-3
‘ Step 1 TLEV value.
SENS:PCUR:STEP:TLEV2 200e-3
‘ Step 2 TLEV value.
SENS:PCUR:STEP:TLEV3 200e-3
‘ Step 3 TLEV value.
SENS:PCUR:STEP:TLEV4 200e-3
‘ Step 4 TLEV value.
SENS:PCUR:STEP:TLEV5 200e-3
‘ Step 5 TLEV value.
SENS:PCUR:STEP:TLEV6 200e-3
‘ Step 6 TLEV value.
READ:ARR?
‘ Trigger and return the 6 step measurements
After sending this command, wait a few seconds before generating a one shot pulse sequence.
Continuous pulse train
The following command sequence measures pulses similar to the one shown in
Figure 3-10
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 5 A 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: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 600 mA, 300 mA, and 100 mA steps, but not
‘ so short it misses the 450 mA step (600
μ
sec x
‘ 3 = 1.8 msec). Using 3
μ
sec 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.
NOTE
To function correctly, the current range must be selected before setting the
trigger level step setting.
Summary of Contents for 2308
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