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JX-W9
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Safety Precautions
(Electrical shock hazard testing)
electrical shock.
® Alternate check method
Plug the AC
line cord directly into the AC outlet.
Use an AC
voltmeter
having
1,000 ohms
per volt
or more sensitivity in the following
manner.
Con-
nect a 1500 2 10W resistor paralleled by a 0.15 uF
AC-type
capacitor
between
an exposed
metal
part
and a known good earth ground.
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed
metal
part having a
return
path
to the chassis, and
measure
the AC
voltage across the resistor. Now, reverse the plug in
the AC outlet and repeat each measurement.
Any
voltage measured must not exceed 0.75 V AC(r.m.s.).
This corresponds to 0.5 mA AC (r.m.s.).
AC VOLTMETER
ae
(Having 1000 ohms/volt,
Place
this probe
15000 10W
on each exposed
metal part.
Good Earth Ground
(No. 70053} 3
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