Mode Selector Switch Sk7 At "A Delayed By B - Philips PM 3347 Manual

16
B. AT "B INTENSIFIED BY A"
When the X-deflection switch at the main frame is
at "X UNIT" and switch SK7 on the time-base B
unit is at "B INTENSIFIED BY A" the relevant
interconnections are shown in Fig. 13.
The output of time-base B drives the horizontal
amplifier and the delay circuit.
Note Remember that in this position, time-base A
is operating via the reset circuit of the lock-out mul-
tivibrator.
Y-
UNIT
TR IGGE R
CIRCUIT
> B/I
INTENS'D O
BY"A"
~~ O
OR
GATE
SK7
The output of the delay circuit is fed to the lock-out
multivibrator of Time-base A via the reset circuit.
Thus the Time-base A is brought into action i.e. it
generates a sweep and an unblanking pulse.
This unblanking pulse supplements that delivered by
Time-base "B" via an OR-gate. The relevant wave
forms are shown in Fig. 14.
BUX
TIME BASE.B
L
DELAY
CIRCUIT
10
X-AMPL
17
2
Y-
UNIT
Starts'A"
~O SK6
3
TRIGGER
CIRCUIT
JL
Sets"A"readyo
015 ~ STAB,CONTROL
2
TIME BASE.AI
Fig. 13. Mode selector switch SK7 at "B" intensified by "A"
RESET
CIRCUIT
PEM 2874