Current Readback Accuracy; 5A Range Readback Accuracy - Keithley 2302 Instruction Manual

Current readback accuracy

Follow the steps below to verify that Model 2306 current readback accuracy is within
specified limits. The test involves setting the output current to specific values as measured with
a resistor and precision digital multimeter.

5A range readback accuracy

1.
2.
3.
4.
5.
1.
Table 13-5
5A range current readback accuracy limits
Nominal output
Voltage
1V
2V
3.000A
4V
4.5V
1
As determined from digital multimeter voltage reading and 1Ω resistor.
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With the power supply's output off, connect the digital multimeter and characterized 1Ω
resistor to the Model 2306 OUTPUT #1 SOURCE terminals, as shown in
Be sure to observe proper polarity (SOURCE + to INPUT HI; SOURCE - to INPUT
LO). Be sure to use 4-wire connections to the resistor terminals.
Select the multimeter DC volts measuring function, and enable auto-ranging.
Select Channel #1 by pressing the
Channel #2, and select the 5A readback range. Also make sure actual current readings
are displayed.
Turn on the Model 2306 output.
Verify 5A range current readback accuracy for the currents listed in
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 5A.
• 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 Model 2306 current reading is within the limits given in the table.
After changing connections to OUTPUT #2, repeat steps 1 through 5 for Channel #2 (use
the and keys to toggle between Channel #1 and Channel #2).
Model 2306
Output current
1.000A
2.000A
3.000A
4.000A
4.500A
Performance Verification
and keys to toggle between Channel #1 and
Current readback limits
1
(2 Years, 18°C-28°C)
0.9978–1.0022A
1.9958–2.0042A
2.9938–3.0062A
3.9918–4.0082A
4.4908–4.5092A
13-11
Figure 13-2.
Table 13-5. For each