Tektronix 492 Operator's Handbook

19
RESOLUTION
BANDWIDTH . This is
also a
continuous detented
control that selects
resolution
bandwidth .
Bandwidth is
indicated
by
crt readout . Range of selection is 1 kHz to 1 MHz
in decade steps . An additional resolution band
width of 100 Hz , when Option 3 is installed , is
provided . Changing the resolution bandwidth
with this
control deactivates AUTO
RESOLUTION .
20
2-8
VERTICAL
DISPLAY .
These
four
pushbuttons
select the
display
mode . The
crt
readout
indicates
scale
factor
.
10
dB
/
DIV
-
When
activated ,
the
dynamic
range
of the
display
is a
calibrated 80 dB with
each
major graticule representing 10 dB .
dB /
DIV -
Increases
resolution so
that
each
major
graticule
division
represents
2 dB .
LIN -
Selects
a
linear
display
between
zero
volts
( bottom graticule line ) and the reference level
( top graticule line ) scaled in volts / division . See
REFERENCE
LEVEL .
21
22
PULSE STRETCHER - Increases the fall time of
pulse signals so very narrow pulses in a line
spectrum display can be seen . The effect is most
apparent for
discrete
signals
analyzed
at
resolution
bandwidths that
are
narrow
compared
to the span ; PULSE STRETCHER may be
necessary for digital storage of such signals ,
especially if they are averaged .
VIDEO FILTER
. One of two
(
NARROW and
WIDE ) filters can be activated to reduce the video
bandwidth and
reduce
and
reduce
high
frequency
components for display noise averaging . The
NARROW
filter is
approximately 1 /
300th
of
the
selected resolution bandwidth ; the WIDE filter is
about
1 /
30th the
bandwidth .
Activating
either
filter cancels or deactivates the other filter . Press
the pushbutton to switch the filters off .
DIGITAL
STORAGE
( Option 2 ) .
Five
pushbuttons and one
control operate the
digital
storage functions . With none of the pushbuttons
activated
, the
492
display is not
stored .
VIEW A ,
VIEW B - When
either or
both of these
pushbuttons are selected , the pushbutton
illuminates and the
contents
of
memory
A
and / or
492 Operator's Handbook

Tektronix 492 Specifications

General

Brand	Tektronix
Model	492
Category	Measuring Instruments
Language	English