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8
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1
Input
channel A
Input
channel B
Time-base
sweeps
I
2
3
L
Output
Vertical
amplifier
Fig. 4. Typical waveforms
II
II
Iff
1Y
2
3
L
5
TY
then that from the other. In this way, the spot will fol-
low apart of each signal in turn as shown in Fig. 4 and
as it will not be the same part each sweep, the persis-
tance of vision (and sometimes that of the CRT) will
create the illusion of two complete waveforms on the
screen, as shown in Fig. 5. To prevent hazing as the
spot moves from one trace to the other, blanking pulses,
derived from the blocking oscillator, are fed to the
CRT via 9 BU-Y.
III
IY
I
II
III
3
L
5
6
Fig. S. Display
~~
3
L
5
6
7
_~
I
II
~-
5
6
7
0
I
_~
PEM 2898
In the EXT. CHOPPED position, operation is the
same as for CHOPPED, except that now the blocking
oscillator will not be free-running but has to be trig-
gered, via BU2, by an external signal.
In the ALTERNATE position, the blocking oscillator
is triggered during the fly-back of the time-base. Thus
the spot traces out first one signal and then the other.
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