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Checking and adjusting
45
12. Crosstalk
- Set SK3 to position "0.1 V/div".
Turn R6 and R7 clockwise.
- Set SK4 to position ".03 V/div".
- Short-circuit BU4 with respect to earth.
- Apply a pulse-shaped voltage of 100 mV
p
-
p
to BU2, with a repetition
frequency of 200 kc/s. The X deflection must not exceed 0.2 division.
H. TIME BASE GENERATOR
1. Internal triggering
Turn R513 clockwise and R7 anti-clockwise.
- Set SK4 to position "ISN".
- Adjust R3 so that the time base generator has just cut out.
- Apply to BU2 a sinusoidal voltage of a frequency of 1 kc/s and an
amplitude such that the picture height is 0.5 division.
- Adjust R513 in such a way that a triggered picture appears on the
screen.
- Change the frequency of the input voltage successively from 5 c/s to
200 kc/s. With a correct adjustment of R3, the picture must be sta-
tionary at these frequencies, even if R7 is turned clockwise.
2. External triggering
To BU7 apply a voltage of 0.5 V
p
_
p
which derived from the same
voltage source as the voltage applied to BU2.
- With a correct adjustment of R3, the time base generator must start
smoothly and the picture must be stationary at frequencies of 5 c/s and
200 kc/s.
3. Linearity of the time base
- Set SK2 to position ".02 ms/div.".
- Apply a sinusoidal voltage to BU2, with a frequency of 50 kc/s and
with such an amplitude that the picture height amounts to 8 divisions.
- Display a number of periods on the screen and by means of R7 adjust
the second period from the left to a width of 2 divisions. The second
period from the right may be max. 0.5 divisions wider or narrower than
2 divisions.
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