16
Survey
of
adjusting
elements
fl
Adjustment
Adjllsting
Fig.
Measuring
de
vice
Chapter
IX
element
Frequency response
curve
RI8
e22
el
)
6 Oscilloscope +
PM 5120
or
PM
5121
B2
Distortion Distortion meter
e
Amplitude R26
6
LF
valve voltneter
D
Oscilloscope
Mark/space ratio
of
the R20
6
OsciIloscope
E
square wave voltage
(see Fig. 4)
Checking
and
adjusting
•
The
tolerances stated
beloware
factory tolerances which apply when
the
apparatus
is
re-adjusted. They may differ from the
data
given in
Chapter
II.
All checks
and
adjustments should be carried
out
at
a 16-V supply
volt
ag
e,
uniess otherwise stated .
A.
BATTERY CURRENT
- Set
SKl
to position "
ON
".
-
Measure
the
current
consumption.
At
a supply voltage
of
18
V the
current
consumption
should be:
24
mA
± 3
mA
in position
'1
25
mA
± 3
mA
in position "-'
B.
FREQUENCY
RESPONSE
CURVE
1.
Mecbanical check
- Set the frequency dial to position 15.
- Set SK3
to
position
"-'.
- Set
SK2
to position x 100.
- Connect
an
oscilloscope to sockets
BUI
- BU2.
- Check
that
the frequency
is
1500
Hz
±
10Hz.
If
the tolerance
is
greater, remove the cap from the frequency dia l
and
loosen
the
nut.
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