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18
C.
AT "A DEL'D BY B"
When the X-deflection is at "X-UNIT" and switch
SK7 on unit time-base B is at "A DEL'D BY B", the
relevant interconnections are as shown in Fig. 15.
Unblanking is provided only by Time-base "A".
The horizontal amplifier is driven from Time base A.
UN T ~
TRIGGER
CIRCUIT
p." DEL'D o
SK 7
BY "B'i~
I
i
TIME BASE B
DELAY
CIRCUIT
I
~
I
SK7
d,
The output from the delay circuit is fed to the lock-
out multivibrator of Time base A via the reset circuit.
The portion of the display that was intensified in the
previous position of SK7 is now expanded horizontal-
ly to occupy the entire screen width (Fig. 16).
Bux
1
2
X-AMPL.
_
Y-
TRIGGER
UNIT ~
CIRCUIT
Starts~A"
o SK6
31
~
Sets'G,"ready o
1
26
~ STAB. CONTROL
TIME BASE A
Fig. 1 S. Mode selector switch SK7 at "A delayed by B"
RESET
CIRCUIT
PEM 2875
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