Tektronix 53C, Instruction Manual

Page: 7 / 20

Alternate
Turning the MODE switch to the ALTER­
NATE position returns both grids of the multi­
vibrator to a negative potential and it is then
bistable. At the end of each sweep cycle a nega­
tive-going trigger is generated and is coupled
to the multivibrator through the Trigger Coup­
ling Diode V3803. Each trigger causes the multi­
vibrator
to “flip” from one stable state to the
other. This alternately switches the amplifiers
on and off but now the switching rate is deter­
mined by the sweep repetition rate.
TYPE 53/54C — CIRCUIT DESCRIPTION — PAGE 2