Model 2750 Multimeter/Switch System Service Manual Performance Verification 1-3
Verification test requirements
Be sure that you perform the verification tests:
• Under the proper environmental conditions.
• After the specified warmup period.
• Using the correct line voltage.
• Using the proper calibration equipment.
• Using the specified reading limits.
Environmental conditions
Conduct your performance verification 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 80% unless otherwise noted.
Warmup period
Allow the Model 2750 to warm up for at least two hours before conducting the verifica-
tion
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 10°C (18°F) outside the specified
temperature range.
Also, allow the test equipment to warm up for the minimum time specified by the manu-
facturer.
Line power
The Model 2750 requires a line voltage of 100V/120V/220V/240V, ±10% and a line fre-
quency of 45Hz to 66Hz or 360Hz to 440Hz. Note that the line frequency is automatically
sensed at powerup, but the line voltage must be manually set to either 100V/120V or
220V/240V as described in Section 3.
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