Verification test requirements
Be sure that you perform these verification tests:
• Under the proper environmental conditions.
• After the specified warmup period.
• Using the correct line voltage.
• Using the proper test equipment.
• Using the specified output signal and reading limits.
Environmental conditions
Conduct the verification procedures in a location that has:
• An ambient temperature of 18 °C to 28 °C (65 °F to 82 °F)
• A relative humidity of less than 80 percent, unless otherwise noted
Warmup period
At the factory, instruments are calibrated without any switch cards installed and all slots are covered
with blank slot covers. The slot covers come installed on the instrument when it is shipped.
If it is more convenient to adjust the instrument with switch cards installed, make sure all channels
are open and any empty slots are covered with blank slot covers.
Allow the System Switch/Multimeter to warm up for at least two hours before performing adjustment.
If the instrument has been subjected to temperature extremes (those outside the ranges stated in
Environmental conditions (on page B-2, on page B-21)), allow extra time for the instrument’s internal
temperature to stabilize. Typically, you need to allow one extra hour to stabilize an instrument 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 Series 3700A requires a line voltage of 100 V to 240 V (±10%), and a line frequency of 50 Hz or
60 Hz.
The instrument automatically senses the line frequency at power-up.
Recommended test equipment
The following table summarizes recommended verification equipment. You can use alternate
equipment if that equipment has specifications equal to or greater than those listed in the table. Note,
however, that test equipment uncertainty will add to the uncertainty of each measurement. Generally,
test equipment uncertainty should be at least four times better (more accurate) than corresponding
Series 3700A specifications.
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