2308-900-01 Rev. A / July 2008
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Section Topics
12-9
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 12: Performance Verification
6. Repeat steps 1 through 4 for Channel
#2
(use the or keys to toggle between Channel
#1 and Channel #2).
Current readback accuracy
The test used to verify that current readback accuracy is within specified limits involves setting the
output current to specific values as measured with a resistor and precision digital multimeter.
5 A range readback accuracy
To verify that current readback accuracy is within specified limits:
1. With the power supply’s output off, connect the digital multimeter and characterized 1
Ω
resistor to the OUTPUT #1 SOURCE terminals, as shown in
Figure 12-2
. Be sure to
observe proper polarity ( to INPUT HI; SOURCE - to INPUT LO). Be sure to use
4-wire connections to the resistor terminals.
2. Select the multimeter DC volts measuring function, and enable auto-ranging.
3. Press
the
or keys to select Channel
#1
.
Select the 5 A readback range. Make sure
actual current readings are displayed.
4. Turn on the output.
5. Verify 5A range current readback accuracy for the currents listed in
Table 12-5
. For each
test point:
• By changing the output voltage, adjust the current to the correct value, as determined from
the multimeter voltage reading and characterized resistance value. When setting the
voltage, be sure to set the compliance current to 5 A.
• Note that it may not be possible to set the output current to the exact value. Set the current
to the closest possible value, and modify reading limits accordingly.
• Allow the reading to settle.
• Verify that the actual current reading is within the limits given in the table.
Table 12-4
Compliance current accuracy limits
*
Model 2308 compliance
current setting
Compliance current limits
(2 Years, 18°C-28°C)
1.000 A
0.993 to 1.007 A
2.000 A
1.992 to 2.008 A
3.000 A
2.990 to 3.010 A
4.000 A
3.989 to 4.011 A
4.500 A
4.488 to 4.512 A
*
Check the complete Model 2308 Specifications at
www.keithley.com
for updated compliance current accuracy
limits before verification.
NOTE
When verifying the battery channel (#1), make sure to connect the and
source - to the same pair of pins (both in or both out) on the connector. Do not
mix them due to the internal resistance present on the inner ones. Doing so will
generate incorrect verification data.
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