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pair of input
ca
bles wh
os
e area is subjected to a
magnetic hum field. In prac
ti
ce, both cables should
lie together along their length, and
awa
y
fr
om the
po
we
r
.t
ransformer. Tying the input and output
grounds togeth
er
may also form a ground loop.
A third pr
ec
aution (with input and output grounds
together, as in testing or m
et
ering) is f
ee
d
ba
ck
oscillation, from load c
ur
rent flowing in the loop.
In indus
tr
ia
l u
se
, even the
AC
power line may
pr
o-
vide this feedb
ac
k path. Proper groundin
g,
and
isolation of input
s,
of common-A
C-
line
de
vic
es
is
go
od
practice. Refer to Section 4.2, par. 5 for t
es
t-
ing precautions.
2.6
CONNECTING
POWER
The amplifier
is
furnished with a three-wire
AC
plug as standard equipment. Adapters are readily
available co
mm
ercially for adapting this to a two-
wire
sys
tem
if
n
ec
e
ss
ary.
240
VOLT
CONVERSION
The 0-60
powe
r supply may
be
connected for any of
five voltages. Converting from one to another can
be
simply accomplished with a
so
ldering ir
on
and a pair
of wire cutters. Follow the table sho
wn
with the
schematic.
1) Remove the top cover
of
the 0-60 (held
on
by 8
scr
ews)
.
2) With the unit right side up, and the front panel to-
ward
you
, locate the terminal strip
on
the front in
the near right-hand corner.
3) Make the appropriate change in
jum
pers for the
desired operating voltage.
4) Replace the 2 amp line fuse wi
th
a 1 amp type
3AG
fuse, for all connections 200V and above.
5) Change the line cord tag to r
ead
the correct
voltage.
When
testing the amplifier, the line voltage must
be
the peak equivalent to a sinusoid of the indicated line
voltage when
at
full load. Line regulation problems
can introduce serious
er
rors
in
the measurements
on
an
amplifier.
Only a competent technician should attempt alter-
ation of the line volt
age
connections.
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