Keithley 2500, Руководство по обслуживанию

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Model 2500 Service Manual Calibration 2-3
Calibration considerations
When performing the calibration procedures:
• Make sure the test equipment is properly warmed up and connected to the Model
2500 input or output terminals as required.
• Allow signals to settle before calibrating each point.
• Do not connect test equipment to the Model 2500 through a scanner or other
switching equipment.
• If an error occurs during calibration, the Model 2500 will generate an appropriate
error message. See Appendix B for more information.
WARNING The maximum common-mode voltage (voltage between LO and
chassis ground) is 200V DC. Exceeding this value may cause a shock
hazard.
CAUTION Maximum signal on OUTPUT connectors is 100V @ 20mA DC.
Maximum signal on INPUT connectors is 20mA. Exceeding these
values may result in damage to the instrument.
Calibration cycle
Perform calibration at least once a year to ensure the unit meets or exceeds its
specifications.
Recommended calibration equipment
Table 2-1 lists the recommended equipment for the calibration procedures. You can use
alternate equipment as long as that equipment has specifications at least as good as those
listed in the table. For optimum calibration accuracy, test equipment specifications should
be at least four times better than corresponding Model 2500 specifications.