APT 310XAC, Operation Manual, Page: 10 / 146

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running nominally after the inrush current.
Switching Power Source - A power source that uses switching technology
(integrated circuits and components) in order to generate the output waveform.
Total Harmonic Distortion (THD) - A percentage that is used to identify the
degree of the noise/unclean signal in a power source’ s output waveform.
Transient - a momentary change (spike or dip) in a voltage or current waveform
that can affect the performance of the DUT.
Verification - comparison of measured results against a specification, usually the
manufacturer's published performance figures for the product (e.g. Error = -
0.04V, Spec = ±0.03V , result: "FAIL" ).
Voltage - The amount of force that is needed to move current from point to point.
Measured in volts.
1.3 Safety Precautions
This product and its related documentation must be reviewed for familiarization
with safety markings and instructions before operation.
To prevent accidental injury or death, these safety procedures must be strictly
observed when handling and using the test instrument.
1.4 Service and Maintenance
User Service
To prevent electric shock do not remove the instrument cover. There are no user
serviceable parts inside. Routine maintenance or cleaning of internal parts is not
necessary. Any external cleaning should be done with a clean dry or slightly
damp cloth. Avoid the use of cleaning agents or chemicals to prevent any foreign
liquid from entering the cabinet through ventilation holes or damaging controls
and switches, also some chemicals may damage plastic parts or lettering. Any
replacement cables and high voltage components should be acquired directly
from APT or its distributors.
Service Interval
The instrument must be returned at least once a year to an APT authorized
service center for calibration and inspection of safety related components. APT
will not be held liable for injuries suffered if the instrument is not properly
maintained and safety checked annually.