(T)
Meter Faces
Voltage and
dB
scales
are calibrated
as
shown in Figure
3.
1)
Model
181A
2)
Model
181B
Fig
3
2)
Mechanical
zero
adjustment
screw
Turn
power
switch
(9)
to
off.
Set
the
voltage
calibration to
0
by
adjusting
the
mechanical
zero
adjustment
screw
with
an
insulated
screwdriver.
(3)
Pilot
lamp
When
power switch
(9)
is
pushed up
to
turn
power
on, the
lamp
should
light.
0
“INPUT”
(metallic
terminal)
This is the
ground
terminal
when
measuring
voltage.
(D
INPUT
(plug,
U.H.F.
type)
This is
the
connector
for
applying
voltage
to be measured.
Type
M and
type
UHF
connectors
and
twin-type banana
plugs can be
used
because
0
and
0
are
19mm
apart.
Individual
banana
plugs
may
also
be used
with
0
and
®
separately.
0
RANGE
button
This
button is
used
for
selecting
full
scale
value.
At
each
stop
position,
the voltage
values of
the
full
scale
are indicated in
5
black,
and the
absolute
levels of
0
dB calibration are
shown in
dB.
©
“OUTPUT”
(black terminal)
When
this instrument
is
used as an amplifier, this
output
terminal
is ground.
©
“OUTPUT” (red terminal)
This is the “Hot” output
terminal when this instrument
is used
as an
amplifier.
When the
meter
indicates
full
scale at
each stop
position of the range
switch
©
,
1
Vrms
of
voltage
can be
obtained.
“1”
calibration in
the case
of
181
A
“5”
calibration
in the case of
181B
©
“POWER”
switch
Power
goes on if the switch is pushed up to
“ON”.
®
FUSE
Protects
instrument against
overload and short circuits.
Fuse is
removable by counter-clockwise rotation.
(Jj)
Power supply cord
Connects unit to
power
source.
@
Cord winder
Provides convenient
power cord
storage.
6. Preliminary
notes
6-1
The
line voltage
used
for
this instrument
should
be
±10%
of
the rated
value.
6-2
Mechanical
zero
adjustment of
the
indicator
If
the
pointer
of
the
scale
is not
at
0
when power
is
off,
set
to
0
by
adjusting the mechanical zero
adjustscrew
with an
insulated
screwdriver.
6
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