Tektronix T922 User Manual

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 .

Tektronix T922 Specifications

General

Brand	Tektronix
Model	T922
Category	Test Equipment
Language	English