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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 μs) + User trigger delay

Internal Trigger

Delay (15 μs)

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 Figure 3-2 for

an illustration containing the trigger delay relationship

s 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 80μsec to

833msec range. Auto time (when used) accounts for the internal trigger delay (15μsec).

You can manually set the pulse high time, pulse low time, and pulse average time. However,

you mu

st make sure the integration time covers the portion of the pulse of interest. For example,

if the pulse is high for 600μsec, the high integration time must be ≤600μsec. If not, you will

integrate a low portion of the pulse, and the high pulse measurement will be compromised. Be

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Keithley 2302 User Manual

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