Tektronix 2236 - TRIGGER CONTROLS

Preparation
For
Use
-
2236
Operators
VAR HOLOOFF
B -
Horizontal
deflection
is
provided
by
the B
Sweep generator at a sweep speed determined by
the B
SEC
/ DIV
switch
setting
.
The
start of the
B
Sweep is
delayed
from the
start
of
the A
Sweep by
a
time
determined by
the
settings of
both the A
SEC / DIV
switch and the B
DELAY
TIME
POSI
TION
control .
Gated
frequency
,
period ,
width
,
and
totalize
measurements are
made on the B
Trigger
signal .
Reno
2998
L 비
NOAM
MAX
28
B TRIGGER
INT
LEVELD
SOURCE
ONL
34
SLOPE
IN
25
OUT
33
A TRIGGER
SGL
SWP PPAUTO ,
NOAM
TV
LINE
RESET
LIVFIELD
READY
TRIG'D
LEVEL
26
22
POSITION
Control
Horizontally
positions both
the A
Sweep and the B
Sweep
displays and
horizontally
po
sitions X - axis
in the X - Y
mode .
SLOPE
28
IN :
OUT :
30
A & B
INT
CH1
A
SOURCE
INT
A EXT
COUPLING
AC
u
VERT
MODE
27
LINE
DC
23 A
/ B
SWP
SEP
Control
-
Vertically
positions the
B
Sweep trace with respect to the A Sweep trace when
ALT
HORIZONTAL
MODE
is
selected
.
CH 2 { X1
OC
32
-10
EXT
INPUT
31
1
IM2
22pF
100mV / DIV
400V
pk
29
4205-06
Fig . 2-6 . Trigger controls , connector , and indicator .
24 B DELAY TIME POSITION Control — Selects the
amount of delay time between the start of the A
Sweep and the start of the B Sweep . In A TIME
mode
,
the B
DELAY
TIME
POSITION
control
oper
ates in conjunction with the A TIME POSITION con
trol . The
B
DELAY
TIME
POSITION
control
moves
both
intensified
zones (
reference and
comparisons
)
,
while the A
TIME
POSITION
control
moves
only
one
intensified zone ( time - measurement point ) . Time dif
ference
between
the
start of the
two
intensified
zones
is displayed on the readout . In DLY TIME mode , only
one intensified zone is displayed which is controlled by
the B DELAY TIME POSITION control . The time dif
ference
between
the start
of the A
Sweep and the
start of
the
intensified
zone is
displayed on the
readout
.
ال
displaying and photographing either nonrepetitive
signals or signals that cause unstable conventional
displays ( e.g. , signals that vary in amplitude ,
shape , or time ) . It also allows the gated totalize
function to acquire signals over just one gate inter
val
for
events
counting
.
u
TRIGGER
Refer to
Figure 2-6 for
location
of item
25
through
34
.
P - P
AUTO
-
TV
LINE -
Permits
triggering on
wave
forms having repetition rates of at least 20 Hz and
television lines . Sweep free - runs in the absence of
an adequate trigger signal or when the repetition
rate is below 20 Hz . The range of the A TRIGGER
LEVEL
control is
restricted to
the
peak
- to -
peak
range of the trigger signal .
u
25 A TRIGGER Mode Switches - Three section switch
that
determines the
trigger
mode
for the A
Sweep
.
NORM
-
Sweep
is
initiated
when
an
adequate trig
ger signal is applied . In the absence of a trigger
signal , no baseline trace will be present .
SGL
SWP RESET -
Press in the
spring
-
return but
ton momentarily to arm the A Sweep circuit or a
single - sweep display
or to reset
the CTM when
in
TOTALIZE mode . In
CH 1 V
mode ,
pressing the
SGL SWP RESET button will enter or cancel rela
tive reference mode .
TV FIELD -- Press in both P - P AUTO and NORM
buttons
.
Permits triggering on
television field sig .
nals . A
TRIGGER
LEVEL
control range and auto
baseline are the
same as in P - P
AUTO .
In single -
sweep
display mode , the
trigger
system
operates the same as
NORM
,
except
only
one
sweep is displayed for each trigger signal . Another
sweep cannot be
displayed until the SGL
SWP RE
SET
button
is
momentarily
pressed in
again to
re
set the A Sweep circuit . This mode is useful for
26
TRIG'D
-
READY
Indicator
- LED
illuminates
when
ei
ther P - P
AUTO
or
NORM
Trigger
Mode is
selected
,
when the A
Sweep has
been
triggered
(
TRIG'D
)
.
When
SGL
SWP
RESET
button
is
momentarily
C
2-6