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2308-900-01 Rev. A / July 2008
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Section Topics
2-9
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 2: Basic Power Supply Operation
While in the current limit, the power supply is operating as a constant-current source. As long as
the limit condition exists, the power supply output current will remain constant. The output voltage
is probably less than the programmed value when sourcing current, and probably greater than the
programmed value when sinking current. The LIM message will not appear if the display mode is
set to DUAL V AND I.
TRIP mode
- If
TRIP
mode selected, the output will turn off when the current limit is reached. The
“TRIP” message will appear on the lower line of the display after the current reading indicator (A or
mA). The message will clear when the output is turned back on, unless it trips again because of a
current limit condition. The TRIP message will not appear if the display mode is set to DUAL V
AND I.
To select the CUR LIM MODE from the front panel:
1. Press
the
MENU
key to access the main menu.
2. Press the
▲
or
▼
keys to scroll to
CUR LIM MODE
.
3. Press
the
or
keys to select Channel
#1
or
#2
.
4. Press
ENTER
to select.
5. Press
the
▲
or
▼
keys to scroll to the desired current limit mode (
LIM
or
TRIP
).
6. Press
ENTER
to save your settings and return to the main menu.
Editing output voltage and current limit values
Current limit is a feature that protects the load from damage under overload conditions. The
current limit setting indicates the maximum amount of current allowed to flow through the system.
The setting applies to any of the current range settings.
The current limit setting for the 5 A and AUTO range selections are “remembered.” For the
following examples, assume the current limit setting on the 5 A range is 3 A. Selecting the 5 mA,
50 mA or 500 mA range on the battery channel, or 5 mA on the charger channel defaults the
current limit setting to 1A since that is the maximum allowable setting on those ranges. Switching
back to the 5 A range or enabling auto ranging reinstates the 3 A limit. If the current limit value on
the 5 amps range is
≤
1 A, the limit on the 500 mA, 50 mA, or 5 mA ranges will be the same when
switching from the 5 A range to that range.
NOTE
See
Table 1-3
for an illustration of the menu structure. Rules to navigate the
menu follow the table.
NOTE
Setting changes can be canceled by pressing the
MENU
key.
NOTE
Output voltage and current limit values are channel-specific. The number after
the number sign (#) indicates the channel affected by editing.
▲
▲
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