2308-900-01 Rev. A / July 2008
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Section Topics
3-3
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 3: Pulse Current Measurements
selected on the battery channel. For the charger channel, pulse current is only available on the
5 A current range.
Trigger delay
The high, low, or average integration times can either be manually or automatically set. When a
pulse is detected, there is a 10
μ
sec code execution delay (internal trigger delay - see
Figure 3-2
) before the integration time begins. An additional user trigger delay can be set to allow
the leading edge pulse overshoot to settle. Regardless of the user trigger delay setting, the internal
trigger delay is always present.
Figure 3-2
Trigger delay for high pulse current measurement
The integration time will not start until the trigger delay period expires after detecting the pulse. For
accurate readings, make sure that the trigger delay (user and internal) plus the integration time
does not exceed the time for the overall pulse measurement. Refer to
Figure 3-2
for an illustration
containing the trigger delay relationships for a high pulse current measurement.
Integration times
The three integration time periods for pulse measurements can be set automatically or manually
by the user. When the pulse auto time operation is performed, the instrument measures the high
and low periods of the detected pulse and sets appropriate integration times. The pulse average
time is set to the sum of the measured high and low times. The three integration times apply for all
subsequent pulse measurements until another pulse auto time is performed or the times are
changed manually. The pulse auto time feature can detect pulses in the 80
μ
sec to 833 msec
range. Auto time (when used) accounts for the internal trigger delay (10
μ
sec).
You can manually set the pulse high time, pulse low time, and pulse average time. However, you
must make sure the integration time covers the portion of the pulse of interest. For example, if the
pulse is high for 600
μ
sec, the high integration time must be
≤
600
μ
sec. If not, you will integrate a
low portion of the pulse, and the high pulse measurement will be compromised. Be sure to factor in
High
Low
Average
High
= integration time specified for high measurement time +
Trigger Delay
Low
= integration time specified for low measurement time +
Trigger Delay
Average
= integration time specified for average measurement time +
Trigger Delay
Trigger Delay
= Internal trigger delay (10
m
s) + User trigger delay
Internal Trigger
Delay (10
m
s)
User Trigger Delay
Trigger Delay
Integration Time
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