2308-900-01 Rev. A / July 2008
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Section Topics
3-5
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 3: Pulse Current Measurements
The menu item AVER READINGS #1/#2 applies to average readings for DVM, I, and V, where the
AVERAGE READINGS under PULSE CURRENT #1/#2 applies to pulse current measurement.
Current range
The instrument will not auto range with the pulse current measurement function selected. Changes
to the auto range setting are not used during pulse current measurements but are retained for
when pulse current measurements are no longer taken. Pulse current measurements may be
performed on any of the current ranges for the battery channel (#1).
Pulse current measurements
are always performed on the 5 A range for charger channel (#2). Therefore, selecting pulse
current with the 5 mA range active on the charger channel (#2)
will cause the supply to first switch
to the 5 A range regardless of the current range setting (5 mA or AUTO).
Current range is linked to current limit. Therefore, as a general rule, the user selects the current
range before setting the current limit (see
Outputting voltage and current
). Current range is
selected from CURRENT RANGE #1/#2 item of the menu (CURRENT RANGE #1 refers to the
battery channel while CURRENT RANGE #2 refers to the charger channel).
Integration times
Use the following items of the PULSE CURRENT #1/#2 menu item to set integration times:
•
HIGH TIME
- Use to set the integration period (in
μ
sec) for high pulse-current
measurements. Make sure to account for the internal (10
μ
sec) and user trigger delay.
•
LOW TIME
- Use to set the integration period (in
μ
sec) for low pulse-current
measurements. Make sure to account for the internal (10
μ
sec) and user trigger delay.
•
AVERAGE TIME
- Use to set the integration period (in
μ
sec) for average
pulse-current measurements. Make sure to account for the internal (10
μ
sec) and user
trigger delay.
•
AUTO TIME
- Use to automatically set the integration times for high, low, and average pulse-
current measurements. These times are based on detecting the pulse and remain until
another auto time is performed or the times are manually changed. Auto time accounts for
the internal (10
μ
sec) delay but not the user trigger delay.
•
PULSE TIMEOUT
- Use to set the variable pulse current time-out feature for pulse current
measurements. The default value is 1.000 second (incremented in 1ms steps). See
Using
FAST, SEARch, and DETect
for detailed usage information on properly setting this
TimeOUT variable.
Average readings count
Use the AVERAGE READINGS item of the PULSE CURRENT #1/#2 menu item to set the
average readings count. This count specifies the number of measurements (integrations) to
average for each reading. For example, with measurement count set to 10, each displayed
NOTE
To get better trigger level resolution, make sure the current range (battery
channel only) is set appropriately for the expected measurement.
NOTE
Set PULSE CURRENT integration times in the range of 33.3
μ
sec to 833 ms
(833333
μ
sec) in 33.3333
μ
sec steps.
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