Model 2281S-20-6 DC Power Supply and Battery Simulator Reference Manual
Section 3: Functions and features
077114601 / March 2019
3-69
Capacitance measurement
The 2281S can measure capacitance (C) only when it is using the battery test function.
The instrument charges the capacitor in constant current mode and monitors the voltage ramp rate to
determine the ratio of delta voltage ( V) to delta time ( t).
The instrument calculates the capacitance using the following formula:
Figure 105: Model 2281 capacitance equation
Measuring capacitance in the battery test function
You can measure capacitance from the front panel or using SCPI commands.
To measure capacitance from the front panel:
1. Connect the capacitor to the instrument.
2. Select the battery test function on the startup screen.
3. Press the
MENU
key.
4. Under
Measure
, select
A-H/C
.
5. Set the target voltage next to
V-Full
.
6. Set the capacitor charging current next to
Source I-Limit.
7. Set the low voltage point used for the voltage ramp rate calculation next to
V1 (Low Voltage)
8. Set the high voltage point used for the voltage ramp rate calculation next to
V2 (High Voltage)
V1 (Low Voltage) must be lower than V2 (High Voltage), which must be lower than V-Full
9. Return to the battery test home screen by pressing
HOME
on the front panel.
10. Go to soft key area 2 and select
Measure C
. The capacitance measurement is made and saved
to internal memory.
