KDL
-32/37
/40
/46/55EX500 Se
ri
es
(AEP/U
K)
8
SA
FE
TY CHE
CK-OUT
Leakage Test
The AC le
ak
age from a
ny exposed me
tal part to
earth ground and from a
ll exposed me
tal parts to
any exposed met
al part having a r
etur
n
to cha
ssis, must not exce
ed
0.5 mA (500 m
icroa
mper
es).
Leakage cur
rent can be measured
by any one of t
h
ree me
thods.
1. A comme
rcial le
akage
tester, such as
the Si
m
ps
on 229 or RCA WT-540A. Follow the
ma
nufa
cture
rs’
instructions to use the
se instructions.
2. A battery-
operat
ed AC milli
am
pme
ter. The Da
ta Precision 245 digita
l multi
me
ter i
s suitable
fo
r this job.
3. Measuring the volt
age drop across a resistor
by means of a
VOM or battery-opera
te
d AC
volt
m
et
er. The “l
im
it
”
indica
tion is 0.75 V, so
analog me
te
rs must have a
n ac
curat
e l
ow
voltage scal
e.
The Si
m
pson’s 250 and Sanwa SH-63TRD are e
xa
m
pl
es of passive VO
Ms that are suitable.
Nearly a
ll batt
ery-opera
ted di
gital
multimeters that have
a 2 VAC range are suitabl
e (see
Figure A).
H
o
w
to Find a
Good E
a
rth Ground
A cold-wate
r pipe is a guarant
eed ea
rth ground; th
e cover-pla
te ret
aining screw on m
o
st AC outlet
boxes is also at e
arth ground.
If the re
ta
ini
ng screw is to be used as your earth ground, verify that i
t is at
ground by me
asuring t
h
e
resistance betwe
en it and a cold-wa
ter pipe with
an ohmme
te
r. The re
adi
ng should be zero ohm
s.
If a cold-wa
ter pipe is not ac
cessible, conne
ct a 60-
to 100-watt trouble-
li
ght (not a ne
on la
mp)
betwe
en the hot side of t
h
e rec
ept
ac
le and the re
taining screw. Try both slots, if nec
essary, to
loca
te the hot side on the line; the l
a
mp should li
ght at nor
ma
l
b
rilli
anc
e i
f the screw is at ground
potenti
al (se
e Figure B).