Model 6487 Reference Manual Calibration 16-3
Calibration considerations
When performing the calibration procedures:
• Make sure that the test equipment is properly warmed up and connected to the cor-
rect Model 6487 terminal(s).
• Always allow the source signal to settle before calibrating each point.
• Do not connect test equipment to the Model 6487 through a scanner or other
switching equipment.
• If an error occurs during calibration, the Model 6487 will generate an appropriate
error message.
t^okfkd The maximum safe voltage between the voltage source or ammeter and
chassis ground (common mode voltage) is 505V DC. Exceeding this
voltage can create a shock hazard.
`^rqflk Maximum continuous input voltage is 505V DC. Exceeding this value
may cause instrument damage.
Calibration cycle
Perform verification at least once a year to ensure the unit meets or exceeds its specifica-
tions (see Section 15). Calibrate if necessary.
Recommended calibration equipment
Table 16-1 lists the recommended equipment for the calibration procedures. You can use
alternate equipment, but keep in mind that test equipment uncertainty will affect calibra-
tion accuracy. Calibration equipment should have accuracy specifications at least four
times better than corresponding Model 6487 specifications. Note, however, that the recom-
mended calibrator listed in Table 16-1 does not meet this requirement for 20μA output.
Table 16-2 lists uncertainty ratios for current calibration equipment, while Table 16-3 lists
uncertainty ratios for voltage source calibration equipment.
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