2308-900-01 Rev. A / July 2008
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12-7
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 12: Performance Verification
Voltage readback accuracy
Follow the steps below to verify that the voltage readback accuracy is within specified limits. The
test involves setting the source voltage to specific values, as measured by a digital multimeter, and
then verifying that voltage readback readings are within required limits.
To verify that voltage readback accuracy is within specified limits:
1. With the power supply’s output off, connect the digital multimeter to the OUTPUT #1
SOURCE and SENSE terminals, as shown in
Figure 12-1
. Be sure to observe proper
polarity ( and SENSE + to INPUT HI; SOURCE - and SENSE - to INPUT LO).
2. Select the multimeter DC volts function, and enable auto-ranging.
3. Select
Channel
#1
by pressing the or keys to toggle between Channel
#1
and Channel
#2
. Make sure actual voltage readings are being displayed (use DISPLAY).
4. Turn on the output.
5. Verify voltage readback accuracy for each of the voltages listed in
Table 12-3
. For each test
point:
• Set the output voltage to the indicated value as measured by the digital multimeter. If it is
not possible to set the voltage source precisely to the specified value, use the closest
possible setting and modify reading limits accordingly.
• Set compliance current to 0.25 A (or 250 mA).
• Allow the reading to settle.
• Verify that the actual voltage reading is within the limits given in the table.
6. After changing connections to OUTPUT #2, repeat steps 1 through 4 for Channel #
2
(use
the or keys to toggle between Channel #1 and Channel #2).
NOTE
When verifying the battery channel (#1), make sure you connect the
and source - to the same pair of pins (either both in or both out) on the
connector. Do not mix them because the internal resistance present on the
inner pins will cause incorrect verification data to be returned.
Table 12-3
Voltage readback accuracy limits
*
Model 2308 output
Voltage setting
**
Voltage readback limits
(2 Years, 18°C-28°C)
5.00 V
4.995 to 5.005 V
10.00 V
9.992 to 10.008 V
14.00 V
13.990 to 14.010 V
*
Check the complete Model 2308 Specifications at
www.keithley.com
for updated voltage readback accuracy
limits before verification.
**
As measured by digital multimeter.
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