Output Waveform - Tektronix T PLUG-IN Instruction Manual

control is adjusted so that the grid voltage is
just high enough to prevent the circuit from
free-running. Adjusted in this manner, a saw-
tooth will be produced only when a negative-
going trigger from the Schmitt Trigger can
drive the stage into cut-off. For convenience,
a PRESET STABILITY control can be connected
into the circuit via switch SW7500. In the
PRESET position a fixed negative dc voltage
is obtained from R7520 and applied to the
grid of V7650B. This control, which is adjust-
able from the front panel of the Type T, can
be used in most triggering applications of the
instrument. Where triggering may be critical,
however, the variable STABILITY control should
be used.
Output Waveform |
The positive pulse appearing at the cathode
of V7650A is coupled through the GATE OUT
C.F. V7750B to the front-panel +GATE OUT
connector, and is also used to automatically
supply the unblanking pulse when used with the
Tektronix Type 536 Oscilloscope.
A banana plug, mounted at the rear of the
Type T Plug-In, connects to a banana jack
the Type T is used inthe HORIZONTAL channel.
For use in the VERTICAL channel of the Type
536, or for use in other plug-in type Tektronix
oscilloscopes, the +GATE OUT connector can
be connected to the oscilloscope EXT CRT
CATHODE, or INTENSITY MOD INPUT
connector, to provide crt unblanking. The
positive pulse at the +GATE OUT connector
Circuit Description - Type T
pulse is coincident with the starting time and
duration of the sawtooth time-base waveform.
The sawtooth time-base waveform at the
cathode of V8110A, in addition to driving the
horizontal amplifier of the oscilloscope, is also
coupled through the cathode follower V7940B
and to the SAWTOOTH OUT connector on the
front panel of the Type T Plug-In Unit. This
provides a 150-volt linear rise in voltage,
Starting at zero volts with respect to ground.
5X Magnifier
The sawtooth waveform appearing at the cath-
ode of the Runup C.F. V8110A has an amplitude
of approximately 150 volts, far in excess ofthat
The 5X MAGNIFIER switch, SW8420, changes
MAG, CENTERING control, R8480, determines
the position of the start of the time-base on the
crt screen,
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