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Return: The path by which current returns to a source.
RMS: The Root Mean Squared value of a voltage or current waveform. An RMS
waveform delivers the same amount of energy to a load as a DC waveform of the same
value. For a sinusoid, the RMS value is .707 x the peak value.
Total Current: The vector sum of the real current component and the reactive current
component produced by an applied voltage.
VA: A rating of instantaneous power found by multiplying an instrument's maximum
output current by its maximum output voltage.
Voltage: The force which causes current through an electrical conductor, given in
volts (V). Symbol = V
1.4. Safety
This product and its related documentation must be
reviewed for familiarization with safety markings and
instructions before operation.
This product is a Safety Class I instrument (provided with a
protective earth terminal).Before applying power verify that
the instrument is set to the correct line voltage (115 or 230)
and the correct fuse is installed.
This product carries an NRTL (Nationally Recognized
Testing Laboratory) and comes equipped with an audible
and visual failure indicator.
1.4.1. 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.
Avoid the use of cleaning agents or chemicals on the instrument,
some chemicals may damage plastic parts or lettering. Any
external cleaning should be done with a clean dry or slightly
damp cloth. Schematics, when provided, are for reference only.
Any replacement cables and high voltage components should be
acquired directly from Extech Electronics Co., Ltd..
4
747X Series produces
voltages and currents that
can cause harmful or fatal
electric shock. To prevent
accidental injury or death,
these safety procedures
must be strictly observed
when handling and using the
test instrument.
SAFETY
This instrument
meets UL
requirements for
audible and visual
failure indication.
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