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H
52005-301D
box,
afte
r withdrawing
the
screws at the
corners of the
mask.
(One
screw at
the r ear
ean
be
left
in position,
but slackened,
and
the
plastic plate
swung- clear
.)
(2)
Turn the range switch SC to
1.
5 V.
Apply
to
the
attcnuator
inlet a
1 k!Lr.
sine
wave;
adjust
this input
to 1.5
V
r.m.s.,
mea
sured
on
a
n
external
standardized
hig-h
impedance
voltmeter;
and set
RV1 so that
the meter
on
the
attenuator
indicates
1.
5
V
exactly.
(3)
Apply a 500
kHz sine wave
to the
attenuator; adjust
the
input to 1. 5
V
r.
m.
s.,
measured on the
external
standardized
mete
r;
a
nd
set
C1 so that
the meter
on the attcnua-
tor indicates
1.
5 V.
(4)
Turn the switch to
5
V and repeat
the above
with an
input of
5 V
r.
m. s., measut·ed
on
the
external standardized meter;
but adjust
RV4
a
nd
C4, at
1kHz and 550 kllz respecti vely,
for
an indication
on the attenuator of
5
V
exactly
.
(5)
Turn the switch to 15
V
and
repea
t
the
above with an
input of
15
V r. m. s.,
meas ured
on the
external standardized meter; but
a djust
R
V3
and
C3,
at
1 kHz and 550
kHz
respec-
tively, for
an
indication
on the attenuator of
15 V
exactly.
(6)
Turn the switch to
25
V
and
r
epea
t
the a
bove with
an
input of
25
V
r
.
m
.
s.,
measure
d
on
the
external
standardized
meter;
but
adjust
R
V2
and C2, at
1
kHz
and 550
kH
z res
pec-
tively,
for an indication on the
attenuator of
25
V
exactly.
Chap.
5
Page G
Nov
.
79
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