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16
Survey
of
adjusting and controi elements
Adjustment
A djusting
Fig.
M easuring de vice
Chapter IX
element
Frequency response
RI8
Oscilloscope
+
curve
e22
6
B2
)
PM 5120
or PM
5121
el
Distortion
R4
6
Distortion meter
e
Amplitude
R26
6
LF valve voltmeter
D
Oscilloscope
Mark/space ratio of the
R20
6
Oscilloscope
E
square wave voltage
(see Fig. 4)
Checking and adjusting
The tolerances
stated
beloware taetory toleranees 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 SK1 to position "ON".
At an 18-V d.c. supply voltage the currem consumption should be
25 mA
-t
3 mA.
B. FREQUENCY RESPONSE CURVE
1.
Mechanical check
- Adjust the hair-line of the dial to
15.
Set SK3 to position "",-," and SK2 to position"
X
100".
- Connect
a
oscilloscope to BU1-BU2.
- Check that the frequency amounts to 1500
c/
s
±
10
e/ s.
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