Tektronix 492 Operator's Handbook

7
8
9
READY . When
SINGLE SWEEP is
selected
,
this
indicator lights while the sweep circuit is armed
and ready for a trigger signal . The indicator stays
lit
until
the
sweep
ends
.
MANUAL
SCAN
. When the
TIME / DIV
selector is
in the MNL position , this control will manually
scan
the
spectrum
.
TIME / DIV . Selects sweep rates from 5 s / div to
20 μs / div in 5-2-1 sequence . This switch also
selects AUTO , EXT , and MNL modes .
AUTO (
automatic
) -In this
position
the
sweep
rate is selected by the microcomputer to maintain
a calibrated display for any FREQ SPAN / DIV ,
RESOLUTION , and VIDEO FILTER combination .
EXT
( external
input ) -This
position
connects the
rear
panel EXT
IN HORIZ / TRIG
connector
to the
horizontal sweep circuit . A voltage ramp of to
+10 volts will sweep 10 divisions of the horizontal
(
x )
axis .
MNL ( manual ) -In this position the horizontal
axis can be swept with the MANUAL SCAN
control .
10
11
12
13
FREQUENCY .
Tunes the
center
frequency
.
Tune
rate is proportional to the selected FREQ
SPAN / DIV . Any given signal moves across the
display at a constant rate for all spans . In MAX
span
, the tuning
range
depends on the band
; for
example
,
in
Band
2 (
1.7-5.5 GHz ) the
frequency
dot will not tune to the extreme left edge of the
graticule , or in Band 6 ( 15-21 GHz ) the dot will
tune only to the right of center .
FREQUENCY RANGE ( band ) . These two push
buttons
shift
the
center
frequency
range up or
down . Frequency range of the band is displayed
on the crt readout .
AF . A
convenience for
measuring
frequency
difference
between
signals
( see
Operational
Procedure ) . When selected , the frequency
readout
goes
to
zero
. It
will
then
read out the
deviation from this
reference as the
FREQUENCY
is tuned .
CAL . When
activated
, the
frequency
readout
can
be
calibrated to center
frequency
by
adjusting
the
FREQUENCY control for the
correct reading .
When calibrated , deactivate the CAL mode .
492
Operator's
Handbook
2-5

Tektronix 492 Specifications

General

Brand	Tektronix
Model	492
Category	Measuring Instruments
Language	English