16-2 Calibration Model 6485 Instruction Manual
Introduction
Use the procedures in this section to calibrate the Model 6485 from the front panel. (See
Appendix H for information on remote calibration.) These procedures require accurate test
equipment to source precise DC voltages, currents, and resistances.
WARNING The information in this section is intended only for qualified service
personnel. Do not attempt these procedures unless you are qualified to
do so. Some of these procedures may expose you to hazardous voltages.
Environmental conditions
Temperature and relative humidity
Conduct the calibration procedures at an ambient temperature of 22˚ to 24˚C with relative
humidity of less than 70% unless otherwise noted.
Warm-up period
Allow the Model 6485 to warm up for at least one hour before performing calibration.
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 10˚C outside the specified temper-
ature 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. The instrument must be calibrated while operating from a line voltage within this
range. Be sure the line voltage setting agrees with the expected line voltage (Section 17).
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