Keithley SourceMeter 2400, Service Manual, Page: 24 / 137

2400-902-01 (G - Feb 2006)
Model 2400 Service Manual 1-12
Performance Verification
4. Verify output current accuracy for each of the currents listed in Table 1-4. For each test
point:
• Select the correct source range.
• Set the Model 2400 output current to the correct value.
• Verify that the multimeter reading is within the limits given in the table.
5. Repeat the procedure for negative output currents with the same magnitudes as those
listed in Table 1-4.
6. Repeat the entire procedure using the rear panel INPUT/OUTPUT jacks. Be sure to
select the rear panel jacks with the front panel TERMINALS key.
Table 1-4
Output current accuracy limits
Model 2400
source range
Model 2400 output
current setting
Output current limits
(1 year, 18•C–28•C)
1µA
10µA
100µA
1mA
10mA
100mA
1A
1.00000µA
10.0000µA
100.000µA
1.00000mA
10.0000mA
100.000mA
1.00000A
0.99905 to 1.00095µA
9.9947 to 10.0053µA
99.949 to 100.051µA
0.99946 to 1.00054mA
9.9935 to 10.0065mA
99.914 to 100.086mA
0.99640 to 1.00360A
Current measurement accuracy
Follow the steps below to verify that Model 2400 current measurement accuracy is within
specified limits. The procedure involves applying accurate currents from the Model 2400
current source and then verifying that Model 2400 current measurements are within required
limits.
1. With the power off, connect the digital multimeter to the Model 2400 INPUT/OUTPUT
jacks as shown in Figure 1-2.
2. Select the multimeter DC current function.
3. Set the Model 2400 to both source and measure current by pressing the SOURCE I and
MEAS I keys, and make sure the source output is turned on.
4. Verify measure current accuracy for each of the currents listed in Table 1-5. For each
measurement:
• Select the correct source range.
• Set the Model 2400 source output to the correct value as measured by the digital
multimeter.
• Verify that the Model 2400 current reading is within the limits given in the table.