Series 3700A System Switch/Multimeter Reference Manual
Appendix B: Verification and adjustment
3700AS-901-01 Rev. D/June 2018
B-21
Environmental conditions
Conduct the adjustment 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%, 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
)), 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.
Adjustment considerations
When performing adjustment procedures:
•
Make sure that the equipment is properly warmed up and connected to the appropriate input
jacks.
•
Make sure the calibrator is in OPERATE mode before you complete each adjustment step.
•
Always let the source signal settle before adjusting each point.
•
If an error occurs during an adjustment, the Series 3700A will generate an appropriate error
message. See
(on page 12-9) for more information.
The input/output terminals of the digital multimeter (DMM) and switch cards are rated for
connection to circuits rated Installation Category I only, with transients rated less than 1500V
peak. Do not connect the DMM or switch card terminals to CAT II, CAT III, or CAT IV circuits.
Connections of the DMM or switch card terminals to circuits higher than CAT I can cause
damage to the equipment or expose the operator to hazardous voltages.
