Model 6220/6221 Reference Manual Calibration 17-3
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Calibration requirements
Be sure that you perform calibration:
• Under the proper environmental conditions.
• After the specified warm-up period.
• Using the correct line voltage.
• Using the proper test equipment.
• Using the specified reading limits.
Environmental conditions
Conduct the calibration procedures in a test environment that has:
• An ambient temperature of 18° to 28°C (65° to 82°F).
• A relative humidity of less than 70% unless otherwise noted.
Warm-up period
Allow the Model 622x to warm up for at least one hour before performing calibra-
tion.
If the instrument has been subjected to temperature extremes (those outside the
ranges stated above), allow additional time for the instrument’s internal tempera-
ture to stabilize. Allow one extra hour to stabilize a unit that is 10°C (18°F) outside
the specified temperature range.
Also, allow the test equipment to warm up for the minimum time specified by the
manufacturer.
Line power
The Model 622x requires a line voltage of 100V to 240V and a line frequency of
50Hz to 60Hz.
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