4-6
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Section Topics
2308-900-01 Rev. A / July 2008
Section 4: Long Integration Measurements
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Measurement configuration
Current range
The instrument will not auto range with the long integration measurement function selected.
Changes to the auto range setting are not used during long integration measurements but are
retained for when long integration measurements are no longer taken. Long integration
measurements may be performed on any of the four ranges for battery channel (#1). Long
integration measurements are always performed on the 5 A range for the charger channel (#2).
Therefore, selecting long integration with the 5 mA range active will cause the supply to first switch
to the 5 A range on the charger channel.
Integration time
Use the following items of the LONG INTEGRAT #1/#2 menu item to set the integration time.
(LONG INTEGRAT #1 refers to the battery channel (#1) while LONG INTEGRAT #2 refers to the
charger channel).
INTEGRATION TIME
Manually set the long integration time. For 60Hz power line frequency, integration time can be set
from 850 msec to 60 sec (1 ms step value). For 50Hz power line frequency, integration time can be
set from 840 msec to 60 sec (1 ms step value).
AUTO TIME
Use to automatically set the integration time. 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 a single pulse.
AUTO TIME searches for two consecutive RISING edges (the setting of trigger edge does not
affect AUTO TIME). Therefore, with NEITHER edge set, the PTT (Pulse Trigger Timeout) bits in
the status model may get set (see
Section 7
on the status model for more information). Although
NOTE
Current range is selected from the CURRENT RANGE #1/#2 item of the menu.
Integration time, trigger edge, trigger level, and pulse timeout are set from the
LONG INTEGRAT #1/#2 item of the menu. Details on integration time, trigger
edge, trigger level, and pulse timeout are provided in the
Overview
.
Table 1-3
shows the menu structure. Rules to navigate the menu follow the
table.
NOTE
To get better trigger level resolution, make sure the current range is set
appropriately for the expected measurement on the battery channel (#1).
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
for details on current range and current limit. Current range is
selected from CURRENT RANGE #1/#2 item of the menu (CURRENT RANGE
#1 refers to the battery channel (#1) while CURRENT RANGE #2 refers to the
charger channel).
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