3-4
Pulse Current Measurements
Figure 3-2
Trigger delay for high pulse current measurement
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 (15
μ
s) + User trigger delay
Internal Trigger
Delay (15
μ
s)
User Trigger Delay
Trigger Delay
Integration Time
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 measurement. Refer to
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
833msec range. Auto time (when used) accounts for the internal trigger delay (15
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
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