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.
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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.
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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
). Calibrate if necessary.
Recommended calibration equipment
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
does not meet this requirement for 20
μ
A output.
lists uncertainty ratios for current calibration equipment, while
lists
uncertainty ratios for voltage source calibration equipment.
