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2308-900-01 Rev. A / July 2008
Section 3: Pulse Current Measurements
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
The step method can be used on a variety of pulse forms. See
Figure 3-6
for pulse forms that can
be measured either as one-shot pulse or as a continuous pulse train. For other pulse forms that
can be measured as one-shot only pulses, see
Figure 3-7
. For pulse trains that have steps that
rise and fall between steps, use the one-shot method to measure the step values (see
Pulse
sequences - rising and falling
). If the continuous method is used on these pulse trains, the first
step may trigger on any step that would be appropriate for that trigger level. For example, a first
step trigger level of 200 milliamps may trigger on any step with an expected value greater that 200
milliamps.
Figure 3-9
shows that with a first step TLEV of 200 milliamps that any one of the six
steps may actually trigger as a first step reading. Hence, the array of step readings may have
overflow readings and/or expected step values out of sequence. In addition, this would vary
between triggered step measurements.
Figure 3-6
Sample pulse forms for step method
Figure 3-7
Sample one-shot only pulses for step method
Trigger level settings
The trigger level may be set to a unique value for each active step. Use the TLEV
x
command to
set appropriate trigger levels for each active step in the waveform. Make sure that the maximum
setting for the selected current range is not exceeded (see
Range with pulse current step
).
Figure 3-8
has 5 rising edge steps and 4 falling edge steps. Set the trigger levels for each step
measurement according to the expected pulses. Based on the wave form, the nine trigger levels
could be set as follows:
For a programming example of this sample, see
Sample step method
.
Table 3-6
Trigger Level Setting for
Figure 3-8
Rising
Falling
TLEV1
100 mA
TLEV6
900 mA
TLEV2
300 mA
TLEV7
600 mA
TLEV3
500 mA
TLEV8
400 mA
TLEV4
700 mA
TLEV9
300 mA
TLEV5
900 mA
4 Up
3 Down
0 Up
4 Down
5 Up
0 Down
0 Up
5 Down
5 Up
0 Down
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