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2308-900-01 Rev. A / July 2008
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Section Topics
4-3
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 4: Long Integration Measurements
Figure 4-1
Steady state for waveforms based on low pulse times
Integration time
The integration time period can be set automatically or manually by the user. The integration time
can be as long as 60 seconds. For 60 Hz power line frequency, the minimum integration time
setting is 850 msec. For 50 Hz power line frequency, the minimum integration setting is 840 msec.
Use AUTO TIME when you want to perform a long integration measurement of each pulse. When
the AUTO TIME operation is performed, the instrument measures the time between two rising
pulse edges and sets an appropriate integration time that will encompass the high and low periods
of the pulse. This integration time applies for all subsequent long integration measurements until
another AUTO TIME is performed or the time is changed manually.
If you want the integration period to encompass two or more pulses, you will have to set the
integration time manually. However, you must make sure that the integration time covers only the
portion of the pulse you want to measure. For example, if you want a long integration of two
pulses, you must make sure that the set integration time does not extend into the third pulse.
Trigger edge
A pulse edge can be used to trigger the start of the measurement. Either a rising or a falling pulse
edge can start the measurement. A pulse has to be detected before a rising or falling pulse edge
can trigger a long integration measurement. All pulses that are less than the specified trigger level
are ignored (
Trigger level
). Pulse edges are ignored while a long integration is in process.
A third option is available if you do not want measurements controlled by pulse edges. With
NEITHER selected, measurements start as soon as the long integration function is selected. This
option does not need a valid trigger level to generate a reading. It will perform a measurement and
produce a reading of the current even if a pulse is not present. Therefore, with NEITHER selected,
the NO PULSE message will not appear on the display.
Trigger level
Before a rising or falling pulse edge can trigger the start of a long integration, the pulse must first
be detected. Trigger level specifies the minimum pulse level that will cause detection. For
example, if the trigger level is set for 2 A, pulses that are
≥
2 A will be detected. Current pulses
<2 A are ignored.
t
low
> 200ms
t
low
< 200ms
Steady
state
Steady
state
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