Tektronix 543B Instruction Manual page 7

SECTION
2
OPERATING INSTRUCTIONS
FUNCTION OF CONTROLS
AND CONNECTORS
*
GOrSiNG
Selects the omplitude point
on the
trigger-
.iVsl
ing
signol
where
sweep-triggering
occurs.
5"-3'UTY
Adjusts the oscilloscope for
a
stoble
dis-
played waveform.
The STABILITY
control
can bo
set
to the
PRESET
position
end
left
there. This
position provides
for
con-
venient triggering
since
only
the
TRIGGER-
ING
LEVEL
control
needs
to
be odjusled
to
obtain
a
stable disploy.
GGERING AUTO;
Permits
normoi
triggering
on smiple
vOGE
waveforms
with repetition rates
higher
than
about 50
cps.
With no
trigger signoi,
or
with 0 lower
repetition rote,
the trigger
circuit
free
runs at
approximotely
AO
cps
and
triggers
the time bose
of
this
rote,
pro-
providing a reference
trace.
AC
LF R£J;
Atfenuofes
trigger-signal
fre-
quencies
below about 17
kc,
allowing
the
trigger circuit to
respond
only
to
higher
frequencies.
AC;
Blocks the
dc component
of the
trig-
gering
signal or^d
allows
triggering
to toke
place only on
the
chonglng
portion of the
signal.
With
frequencies
below
obout
30
cps,
use the
DC
position.
For
best
triggering
of
high
frequencies,
use
an ac coupling position of die
TRIG-
GERING
MODE
switch.
DC:
Permits triggering
on both
high-
and
low-frequency
{to dc) signals.
TRIGGER SLOPE
Determines whether
the time
bose
is
trig-
gered
on the rregotive-
(—
|
or
positive-
[+1 going
slope of the
slgrtal.
LINE: Uses o line-frequency
slgrto!
os
o
trigger.
INT; Uses
o
portion of the signol opplied
to
the vorticol
deflection plates of the
erf
as a
trigger
signal.
EXT: Provides externol triggering
on
o
signal
applied
to the
TRIGGER INPUT
connector.
TiME/CM
Selects the
fime-bosc
sweep
rote.
TIME/CM
Provides on uncolifarotod
sweep
rote od-
VARIABLE
justment.
The
sweep
rote
con
be
slowed
to at least
O.AX any
setting
of the TIME/
CM
switch.
An UNCALiBRATED
lamp
lights
when
the
VARIABLE
control
is
not
In
the
CALIBRATED
po$tt<cn.
HORIZONTAL
DISPLAY
NORMAL
{XI) and
SWEEP MAGNIFIED
positions
expand the display horizontally
by the
amount
indicoted.
Sweep-rate
oc-
curacy
is
±:5%
in
the
magnified posi-
tions.
EXT
position
allows
on
external
signol
to
drive the horizontal deflection system.
The
horizontal deflection
fodor
is
set
by
the
EXTERNAL
HORIZONTAL VOLTS/CM
switch
ond
variable.
MAGNIFIER
Lamps
The
MAGNIFIER
ON
lamp
lights
when-
ever the
HORIZONTAL
DISPLAY
switch
is
in
ony
of
the
SWEEP MAGNIFIED
posi-
tions.
The MAGNIFIER
UNCALIBRATED
lomp
is
connected
to light
whenver
the
sweep
rote
exceeds
the
maximum
coli-
broted
rate
of
0,02 jisec/cm.
This
lamp
will not light
os long as the
setting
of
the
TIME/CM
switch,
divided by
the
mag-
nification
factor
is
not
faster
thon 0,02
usee.
EXTERNAL
HORIZONTAL
VOLTS/CM
VARIABLE
Selects the horizontol deflection factor
when
the
HORIZONTAL
DISPLAY
switch
is
set to
EXT.
The
VARIABLE
control
must
be
fully
clockwise
when
using the
cali-
brated
horizontal deflection factors.
SINGLE
SWEEP
Permits single
sweep
operation
at all
settings
of the
HORIZONTAL DISPLAY
switch except
EXT.
READY Lamp
Lights
when
time-base
circuit
is
ready
for
triggwing
after
being
reset.
HORIZONTAL
POSITION and
VERNIER
Positions
the display
along the horizontol
axis of the
erf.
A.MPLITUDE
CALIBRATOR
Determines
the
peok-to-peok voltage
avail-
able
of the
CAL
OUT
connector.
POWER
ON
Toggle
switch for turning the
instrument
power
on
and
off.
INTENSITY
Controls
brightness of the display.
FOCUS
Used
in
conjunction with the
INTENSITY
and
ASTIGMATISM
controls
for
obtaining
a well-defined disploy.
ASTIGMATISM
Used
in
conjunction with the
INTENSITY
and
FOCUS
controls
for
obtoining o well-
defined
disploy.
TRACE
ROTATION
Permits horizontal
alignment
of the trace
with respect
to
the horizontal
lines
of
the graticule.
The
TRACE
ROTATION
con-
trol is
0 screwdriver adjustment
concentric
with thp
ASTIOMATISM
ci^ntrol
®i
2-1