Tektronix 7834 User Manual

(A) U4428A
X-COMPENSATION INHIBIT
(A
HORIZONTAL)
X-COMPENSATION INHIBIT L- . .
.»

- . ®
(B HORIZONTAL)
MAIN FRAME
CHANNEL
SWITCH SIGNAL (DISPLAY
B)
\
12
DELAY MODE CONTROL
(2) B
(Only) Mode
(3) Alt
or Chop Mode
ALT MODE (HORIZ)
A GATE
cD = HAS NO EFFECT IN THIS CASE
Figure 3-5 . (A) Logic diagram for A Sweep Lockout Stage ; (B) Table of
input/output combinations .
In the B
position of the HORIZONTAL MODE switch,
an Alternate
Pulse is produced at the end of each B
sweep
. (A time-base must be in independent, non-delayed
mode .)
When the HORIZONTAL
MODE switch is set to ALT or
CHOP (A time-base unit must be independent, non-
delayed mode), an Alternate Pulse is produced at the
end of each sweep . For
example, an Alternate Pulse is
produced at the end of the A sweep, then
at the end of
the B sweep, again at the end of the A
sweep, etc .
Although Alternate Pulses are produced
in the CHOP
horizontal mode, they are not used in this instrument
.
(4)
Delayed Sweep (A Delays B)
When
the
A
time-base unit is set for delayed operation,
the operation
of the Alternate Pulse Stage is changed so
an Alternate Pulse
is produced only at the end of the A
sweep, even when the HORIZONTAL MODE
switch is
set to B . This is necessary since
the
A
time-base estab-
Z-Axis
Logic
Q4462
A SWEEP
LOCKOUT
Theory
of Operation---7834
"rr-r LOCKOUT
TO A TIME BASE
/ UNIT .
SEE MAIN
INTERFACE
lishes
the amount of delay time for the B time-base unit
whenever it is displayed .
(5) Amplifier Unit in Horizontal
Compartment
When
an
amplifier
unit is installed in either of the hori-
zontal
plug-in
compartments, the Alternate Pulse can be
produced only from the remaining time-base unit . If
amplifier units are installed in both horizontal compart-
ments, an Alternate Pulse is not produced since there are
no time-base units to produce a holdoff pulse .
The
Z-Axis Logic stage produces an output current signal
at pin 8 of U4494 which sets
the intensity of the crt display
except for the readout display which is controlled by the
Readout System . The output current at pin 8 is determined
by the setting of the A or B INTENSITY controls, the con-
ditions of various logic gates, and by an external Z-Axis
signal .
The input current from the A and B INTENSITY
controls is switched so the output current matches the hori-
zontal
display . The Vertical Chopped Blanking, Horizontal
3- 1 3

Tektronix 7834 Specifications

General

Brand	Tektronix
Model	7834
Category	Test Equipment
Language	English