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Checking ami tn/itiMlny,
39
E. FOCUSING AND ASTIGMATISM
- Display a circle of a diameter of 4 cm on the screen (apply
voltages with a phase difference of 90° to the X and Y i n p u l ) .
- Set R305 in such a way that the picture can be adjusted sli.-nply by
means of R2, both at high and low brightness.
- If necessary, select another value for R304.
F. Y AMPLIFIER
1. Zero setting
- Set SK3 to position "30 V/div.".
- Set SK4 to position "!\N".
Turn R3 clockwise.
- Adjust the time base line to the centre of the screen by nu-;m
N O
r ^4
- Adjust R57 in such a way that the line does not move, if |«, ,
s
|
Mrnec
[
(with shorted input).
2. Sensitivity
- Set SK3 to position ".01 V/div/'.
Turn R6 clockwise, R7 anti-clockwise and R513 clockwise.
- Set SKS to position "I\N\
- Adjust R3 in such a way that the time base generator just cuts out.
- Apply to BU2, a voltage of 80 mV
p
-
p
, frequency 2 kc/s.
- Adjust R513 in such a way that a triggered image appears.
- Adjust R80 in such a way that the picture height is 8 divisions.
3. Y shift
- Apply a sinusoidal voltage (frequency 2 kc/s) to BU2 of such ;i value
that the picture height is 3 divisions (the voltage must be symmetrical
with respect to earth).
- Increase the input voltage by a factor 8.
- Both with R4 fully anti-clockwise and fully clockwise it must IK- possible
to display the peaks of the sinewaves undistorted within the uniiimlp
•*
fs• ii i iv^mi^.
If necessary, replace valves Bl and B2 and repeat the adjustment from
item Fl onwards.
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