Model 6485 Instruction Manual Performance Verification 15-3
Warm-up period
Allow the Model 6485 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 6485 requires a line voltage of 100/120V or 220/240V at a line frequency of 50
to 60Hz. Verification tests must be performed within this range. Be sure the line voltage
setting agrees with the expected line voltage (Section 17).
Recommended test equipment
Table 15-1 summarizes recommended verification equipment. You can use alternate equip-
ment, 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 6485 specifications. Note, however, that the
recommended calibrator listed in Table 15-1 does not meet this requirement for 20µA
output.
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