Tektronix 543B Instruction Manual page 11

Operating
Instructions
—
Type
543B/RM543B
Single-Sweep Operation
Ifi
oppiicotions
where the disployed signal
is
oof repefi-
rrve or vories
in
amplitude, shape, or time,
a phofogroph
of
a conventionol repetitive display
may
produce o jumbled
presen'otion,
To ovoid
this,
use the single-sweep feature to
photograph
this
type of dispioy.
To
use
single
sweep,
first
moko
sure the trigger circuit will
trigger
on the event
you
wish *0 display.
Do
this in
the convontiorvoi manrter.
Then,
press
the
SINGLE
SWEEP
switch
to
RESET
ond
rcleose.
When
this
is
completed, the next trigger pulse will
octuote
the
sweep end
the
Type 543B
will
dispioy the
event
on
0 single trace.
The
READY
lomp, neor the
SINGLE
SWEEP
switch,
first
lights
when
the
sweep
is
reody
to
occept a
trigger
and
then goes out
after triggering
has token place.
To ready
the circuit
for
another single dispioy, press
the
SINGLE
SWEEP
switch to
RESET
and
release.
In
single-
sweep
operotion,
make
sure the
TRIGGER
MODE
switch
is
not
set
to
AUTO.
NONTRIGGERED SWEEP
Ordinarily, the
displayed signal
is
olso
used
to
trigger
•he
oscilloscope
sweep.
In
some
sifueftons,
it
may
be
de-
sirable
to reverse
this
situation.
The sweep-related output
pulses,
available
from
the front
panel of the
Type
543B,
con
be used as a
triggering signal
for
on external device.
The
output
signol
of
the oxfernol device
con then
produce o
stable display
while
the
oscilloscope
sweep
free runs.
To demonstrate one
method
of performing
this
operation,
oroceed
as follows:
Set the
controls
and
switches as follows;
TRIGGER SLOPE
-hEXT
TRIGGERING
MODE AC
STABILITY
Fully
clockwise
TIME/CM
1
msec
Connect
o lead
from the
SAWTOOTH OUT
connector
to the vertical input.
The
dispioy
should
consist of
a
sloping
line.
The oscilloscope display
is
the
sawtooth pulse fhof
is
available during
eoch sweep.
In
o practical application,
the pulse
would
not
be applied
to
the
vertical
input but
instead to
some
external device to
be
tested.
The
pulse
would
then serve
os the trigger
pulse or input signol from
•he external
device, and the
output of the device
would
provide
stable display
on
the oscilloscope, as
though
the
oscilloscope
were
triggered
in
the norma! manner.
The
-^GATE
OUT
connector output
signol of the
Type
5435 con be used os a vorioble repetition-rote pulse
gen-
erator.
To
use the
Type
543B
in this
monner, proceed as
follows:
Set the controls
and
switches as follows:
TRIGGER SLOPE -hEXT
TRIGGERING
MODE AC
STABILITY
Fully
clockwise
TlME'CM As desired
Monitor the
signal
availoble
of the -f-GATE
OUT
con-
nector
on another oscilloscope
and
estoblish
the desired
pulse repeti'ion rate
by
setting
the
TIME/CM and VARIABLE
controls.
Light
Filter
The
light filter
provided with the
Type 543B minimizes
undesirable reflections
when
viewing
the display under high
ombient
light
conditions.
The
filter
moy
be
left
on
when
taking
woveform photographs
unless
o high
writing
rote
is
required.
If
the light
filter
is
removed,
the ert
protector plate should
be instolled to
prevent scratches to
the
ert
face plate.
EXTERNAL
HORIZONTAL DEFLECTION
For special
applications,
horizontal deflection
can be
produced with
an externoMy
derived
signal. Thus,
the
oscilloscope
system
can be used to plot
one
function against
another
(e.g.
Lissojous
figures).
However,
the
system
Is
not
intended
for
precise
phase-angle measurements.
To
use
an external signal for
horizontal deflection,
con-
nect the signal to
the
EXTERNAL HORIZ
IN connector. Set
the
HORIZONTAL DISPLAY
switch
to
EXT and
the
EXTERNAL
HORIZONTAL VOLTS/CM
control
to 0.1,
1
or 10.
The
signol
is
dc coupled
to
the deflection
amplifier.
The time-base generator
still
controls the
unblanking
of the
erf
dispioy
when
the
HORIZONTAL
DISPLAY
switch
Is
set
to
EXT.
To onbtonk the
ert ot
a normal setting of the
INTENSITY
control,
it
will
be
necessary
to
hove
the
SINGLE
SWEEP
switch
set to
NORMAL SWEEP
and
the
time-base
triggering controls
sot for
a free-running
sweep.
If it is
undesirable
to
have
the
time-base generator running, then
the
INTENSITY
control will
have
to
be
turned
up
until
the
beom
is
visible.
DUAL-TRACE
CHOPPED BLANKING
A
dual-trace
piug-in unit
provides two separate traces
on
the
erf
and thus permits
two
functions to
be
displayed
simultoneously.
Detoiled instructions for
operating the
dual-
tfoce plug-in unit
in
conjunction with the
Type 543B Oscillo-
scope are conroined
in
the piug-in unit instruction
manual.
When
the
dual-trace plug-in unit
Is
operated
in
the
chopped mode
to
obtain a dual-trace presentation, switch-
ing
transients
will
bo displayed
on
the
ert.
These switching
fronsienfs
can be reduced by placing the
CRT
CATHODE
SELECTOR
switch on the rear of
the instrument
in
the
CHOPPED BLANKING
position.
INTENSITY
MODULATION
The Type 5438
crt
display
can be
intensity
modulated by
an exfernol signal to display additional information. This
is
done by
disconnecting
the grouriding
bar from
the
EX-
TERNAL CRT
CATHODE
connector
at the rear of the instru-
ment and cortnocling the external signal to this
terminal.
The
CRT
CATHODE
SELECTOR
switch
must be
In
the EX-
TERNAL CRT
CATHODE
position.
Very accurate time
moosurements can be
made
by
intensity
modulating the
beom
with time
markers
ond measuring
directly
from the time
markers
on
the
crt.
A
positive signal
of
approximately 20
volts
is
required to cut off the
beam
from normal
intensify.
The low-frequency
cutoff
point for
s
2-5