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Tektronix T921 - Page 135

Tektronix T921
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TRIGGER
PICKOFF
A
sample
of the
vertical
voltage
signal
from
the
emitters
of
U4134Aand
U4134D
is
applied
to
04176
and
04174
where
it
is
converted
to
a
current
signal
.
This
current
signal
is
applied
to
the
trigger
input
amplifier
(see
diagram
5)
via
trigger
source
switching
circuitry
(see
diagram
4)
.
When
the
SOURCE
switch
is
V
.
2
set
to
INT,
approximately
-4
volts
from
the
trigger
input
amplifier
appears
at
the
04176
collector
circuit,
reverse
biasing
CR4367
.
When
the
source
switch
is
set
to
LINE,
EXT,
EXT
-
10,
or
X-Y,
the
internal
trigger
signal
is
disconnected from
the
trigger
input
amplifier,
permitting
CR4367
to
conduct
and
set
the
collector
of
04176
at
about
-3
volts
.
This maintains
conduction
of
04176,
providing
a
constant
load
to
prevent
distortion
of
the
main
vertical
signal
.

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