Basic Power Supply Operation 2-11
Output impedance
Keithley’s Model 2306 has a variable output impedance feature on the battery channel
(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 voltage drop equation). The output voltage will be reduced by the voltage drop.
V
drop
t() R
I
It()×=
Voltage drop equation
NOTE F
or a more detailed discussion of output impedance and the performance with
various types of loads, see the Applications Guide contained in Appendix E of this
manual.
Changing the battery channel’s output impedance
The Model 2306 output impedance can be checked or changed with the output on or off. The
output impedance is selectable from 0.00Ω to 1.00Ω in 10 milli-Ω steps (default is 0Ω).
Procedure
NOTE The following procedure assumes that the appropriate current range is already select-
ed along with current limit mode and voltage protection.
To set output impedance from the front panel:
1. Press the MENU key to access the main menu.
2. Using the
â–²
and
â–²
keys, toggle channel indicator until #1 is displayed. (Bandwidth is
channel #1 only feature.)
3. Select OUT IMPEDANCE #1 by scrolling through the primary menu items (use the
â–²
and
â–¼ keys to scroll). Scroll until OUT IMPEDANCE is displayed on the bottom line.
4. Press ENTER.
5. Use the
â–² and â–¼ keys to set the desired bandwidth setting (HIGH or LOW). Setting
changes can be canceled by pressing MENU.
6. Press ENTER to save and return to main menu.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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