OPERATION
2.1
Installation of EW604
2.2 Power Supply
Voltage Selection
2.3 Wire Connections
2.4 Range
Selection
Electronic Wattmeter
CHAPTER 2
Inspect the EW604 and if any damage is evident, immediately
notify the carriers and your supplier.
Ensure that the instrument is set to the appropriate
voltage
supply
either
by
inspecting the tag (if fitted)
on
the power cable
or
by
removing the top cover of the instrument. See Chapter
4.1.
Before removing the covers, however, ensure that the mains
plug is disconnected.
The
voltage selection is accomplished
by
a slide switch
on
the
printed circuit board. Set the switch to '115' for operation
from
100 to 125V
and
to '230' for 200 to 250V, 50/60Hz
AC.
The colour code of the power supply cable is:
Brown
Blue
Green/Yellow
Live
Neutral
Ground
The ground wire is connected to the graphite screening of the
case but is
isolated from the front panel 'common' terminal.
The current
and
voltage ranges should
be
selected to suit
the
current voltage present
in
the circuit under test. This is
conveniently done
by
progessively increasing the sensitivity
by
means of the appropriate range switch until the corresponding
overload indicator lights, and then switching back one range.
This
should
be
done with both the current ranges and voltage
ranges.
The
table
in
fig
2.1
lists the full-scale power for the various
current and
voltage range combinations.
1 1
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