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2-12
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2308-900-01 Rev. A / July 2008
Section 2: Basic Power Supply Operation
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
To set output bandwidth from the front panel:
1. Press
the
MENU
key to access the main menu.
2. Press
▲
or
▼
keys to scroll to
OUT BANDWIDTH
.
3. Press
or
keys to select Channel
#1
or
#2
.
4. Press
ENTER
to select.
5. Press
the
▲
or
▼
keys to scroll to the desired bandwidth setting (
HIGH
or
LOW
).
6.
Press
ENTER
to save your settings and return to the main menu.
Output impedance
Keithley Instruments Model 2308 has a variable output impedance feature on the battery channel
(#1). This output impedance setting allows the performance of the battery channel to closely
model a real battery's performance with a dynamic load. When setting the output impedance to a
certain value (R
I
), the output voltage drop will be proportional to the output current (see the voltage
drop equation below). The output voltage will be reduced by the voltage drop.
Voltage drop equation:
Changing the battery channel’s output impedance
The Model 2308 output impedance can be checked or changed with the output on or off. The
output impedance is selectable from 0.00
Ω
to 1.00
Ω
in 10 m
Ω
steps (default is 0
Ω).
To set output impedance from the front panel:
1. Press
the
MENU
key to access the main menu.
2. Press
the
▲
or
▼
keys to scroll to
OUT IMPEDANCE
#1
(Channel #1 only feature).
3. Press
ENTER
to select.
NOTE
The following steps assume that the appropriate current range is already
selected along with current limit mode and voltage protection.
NOTE
Setting changes can be canceled by pressing the
MENU
key.
NOTE
For a more detailed discussion of output impedance and the performance with
various types of loads, see Applications Note 2191 on the Product Information
CD-ROM.
NOTE
The following steps assume that the appropriate current range is already
selected along with current limit mode and voltage protection.
▲
▲
Vdrop t
( )
RI I t
( )
×
=
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