Tektronix 492 Operator's Handbook

Front
Panel
(
Fig
.
2-1
)
1
2
3
4
5
INTENSITY . Controls brightness of the crt trace
and crt
readout
. ( Focus is
automatically
adjusted
electronically . )
READOUT . Switches crt readout on or off . All
spectrum
analyzer
parameters
are read
out
except Time / Div . Brightness is proportional to
the trace brightness and the ratio can be
readjusted by service personnel .
GRAT
ILLUM .
Switches
graticule light on or off .
BASELINE CLIP . When activated , the baseline of
the
display
is
clipped
or
subdued to
increase the
contrast between the display and the baseline .
TRIGGERING . One of four triggering modes can
be
selected by
pushbuttons that
illuminate
when
activated . A SINGLE SWEEP pushbutton plus a
READY indicator provide single sweep operation .
FREE RUN - When activated , the sweep is free
running
without
regard to trigger
signals . When
selected , all
other triggering
modes are
canceled .
6
INT -
When activated , the
sweep
is
triggered by
any
signal at the
left edge of
the
display with an
amplitude of 1.0 division or more . Other trigger
modes are canceled .
LINE - When
activated
, a
sample
of
the ac power
line voltage is used to trigger the sweep . All other
modes are
canceled
when selected .
EXT - When selected , the sweep is triggered by
signals between 0.5 volt peak ( minimum ) to
50 volts peak ( maximum ) that are applied
through the
back panel EXT
IN
HORIZ /
TRIG
connector . When
EXT is
selected , the other
modes are canceled .
SINGLE
SWEEP
. When
selected
, one
sweep is
initiated after the sweep circuit has been
triggered
.
Pushing
this button
does not
cancel
the trigger modes . The button must be pressed to
rearm the sweep circuit after the sweep has run .
When
single sweep
mode
is first
selected , the
present
sweep is
aborted and the
sweep circuit is
not armed . To cancel single sweep , press one of
the trigger mode pushbuttons .
492
Operator's
Handbook
2-3

Tektronix 492 Specifications

General

Brand	Tektronix
Model	492
Category	Measuring Instruments
Language	English