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16
Survey
of
adjusting elements
fl
Adjustment
Adjllsting
Fig.
Measuring de vice
Chapter
IX
element
Frequency respon
se
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
voltage,
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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