Tektronix 465M User Manual

AIR
FORCE
T033AM3-496-1
NAVE
LEX
0969-LP-1
70-0010
Operation
Instructions
MEASURED
POINT
VERTICAL
DEFLECTION
V
REFERENCE
LINE
EXAMPLE:
EXAMPLE;
VERTICAL
„
VOLTS/DIV
-
AMPLITUDE
DEFLECTION
^
SETTING
3
X .5 1.5
VOLTS
DIVISIONS
VOLTS/
DIVISION
PEAK-TO-PEAK
VERTICAL
DEFLECTION
FROM
REFERENCE
y
VOLTS/DIV
„
INSTANTANEOUS
LINE
TO
MEASURED
^
SETTING AMPLITUDE
POINT
5 „
10
DIVISIONS
MILLIVOLTS/
DIVISION
50
MILLIVOLTS
Figure.
4-21. Example
of peak to
peak voltage
measurement.
Figure
4-22. Example
of
instantaneous
voltage
measurement.
b.
Instantaneous
Amplitude
Measurement
(Figure
4-22).
Measure
the
amplitude
of
any
point on a
waveform
with
re-
spect to
ground as
follows:
(1)
Set
AC-GND-DCto
DC.
(2)
Apply
signal
to
be
measured to
either
vertical
in-
put
connector.
Set
VERT
MODE
to
channel
being
used.
(3)
Obtain a
stable
display.
(4)
Set
AC-GND-DC
to
GND.
Position
trace
to
a
reference line.
(5)
Set
AC-GND-DC
to
DC.
If
waveform
appears
above
reference
line,
voltage
is
positive.
If
waveform
ap-
pears
below
reference
line,
voltage is
negative.
(6)
Measure
vertical
difference (in
divisions)
between
reference line
and desired
point on
waveform
and
multiply
by
VOLTS/DIV setting.
c. Dual Trace Phase
Difference Measurement
(Figure
4-23).
Phase
comparisons
between two signals of the
same
frequency can
be made using the
dual trace feature. This
method can be
used up to the
frequency limit of the verti-
cal system and
is usually more accurate and easier to
use
then
the X-Y
method. To make the comparison, use the
following
procedure:
(1)
Set both
AC-GND-DC
to
AC.
(2)
Set
VERT
MODE to
CHOP or
ALT.
(CHOP is
more
suitable
for
low
frequency
signals;
ALT is
more suit-
able for
high
frequency
signals.)
Position
both
traces to
center
horizontal
graticule
line.
(3)
Set A
SOURCE
toCH 1.
(4)
Connect
reference
signal to
CH 1
input
connector
and
comparison
signal
to
CH
2 input
connector
using
coaxial
cables or
probes
which have
equal
time delay.
(5)
If signals are
of
opposite
polarity, push
INVERT
button to
invert
CH 2
display. (Signals
may
be of
opposite
polarity
due to
180°
phase difference;
if so,
take this
into
account in
final
calculation.)
(6)
Set CH 1
and
CH
2
VOLTS/DIV
and their as-
sociated
VAR
controls so
displays are
equal
and about
five
divisions
in amplitude.
(7)
Set
TIME/DIV
to
a sweep
rate which displays
about one
cycle of reference
waveform.
(8)
Set VAR
TIME/DIV until one
cycle of reference
signal (CH
1)
occupies exactly
8
divisions between first
and ninth
graticule lines.
4-42

Tektronix 465M Specifications

General

Brand	Tektronix
Model	465M
Category	Test Equipment
Language	English