Model 2657A High Power System SourceMeter® Instrument Reference Manual Appendix B: Calibration
2657A-901-01 Rev. B/December 2012 B-9
5. Repeat the procedure for negative calibrator currents with the same magnitudes as those listed.
6. Verify current accuracy for high-speed ADC current measurements as follows:
a. Select the correct source range.
b. Set the Model 2657A output current such that the digital multimeter reading is the value indicated in the
"Source current" column of the table below. It may not be possible to set the current source to get
exactly the required reading on the digital multimeter. Use the closest possible setting and modify the
reading limits accordingly.
c. Press the LOAD key then select FACTORY.
d. Select FpVerifyFastAdcI and then press the ENTER key.
e. Press the RUN key.
f. Verify that the Model 2657A fast ADC current reading is within the limits given in the table.
g. Press any key to stop the verification script.
h. Repeat the procedure for negative source currents with the same magnitudes as those listed in the
following table.
High-speed ADC current measurement accuracy limits
Source and measure range* Source current** Current reading limits (1 year, 18 °C to 28 °C)
1 mA 0.5 mA 0.499350 mA to 0.500650 mA
0.9 mA 0.899150 mA to 0.900850 mA
* Measure range coupled to source range when simultaneously sourcing and measuring current.
** As measured by precision digital multimeter. Use closest possible value, and modify reading limits
accordingly if necessary. See Measurement limit calculations
(on page B-4).
Voltage source accuracy
Follow the steps below to verify that the Model 2657A output voltage accuracy is within specified
limits. To perform this test, you will set the output voltage to each full-range value and measure the
voltages with a precision digital multimeter.
The information in this topic is intended only for qualified service personnel. Some of the
procedures may expose you to hazardous voltages that could result in personal injury or death. Do
not attempt to perform these procedures unless you are qualified to do so.
WARNING
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