Model 6487 Reference Manual Performance Verification 15-3
Warm-up period
Allow the Model 6487 to warm up for at least one hour before conducting the verification
procedures. If the instrument has been subjected to temperature extremes (those outside
the ranges stated above), allow additional time for the instrument’s internal temperature to
stabilize. Typically, allow one extra hour to stabilize a unit that is 18°F (10°C) outside the
specified temperature range.
Allow the test equipment to warm up for the minimum time specified by the manufacturer.
Line power
The Model 6487 requires a line voltage of 100 to 120V or 220 to 240V at a line frequency
of 50 to 60Hz. Verification tests must be performed within this range. Be sure the line volt-
age setting agrees with the expected line voltage (Section 17).
Recommended test equipment
Table 15-1 summarizes recommended verification equipment. You can use alternate
equipment, but keep in mind that test equipment accuracy will add to the uncertainty of
each measurement. Generally, the test equipment should have accuracy or uncertainty at
least four times better than corresponding Model 6487 specifications. Note, however, that
the recommended calibrator listed in Table 15-1 does not meet this requirement for 20μA
output. See Table 16-2 and Table 16-3 in Section 16 for details on uncertainty ratios.
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