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Tektronix 314 Manual

Tektronix 314
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HOW
TO
MEASURE
PHASE
Since
a
complete
cycle
of
a
sinusoidal
waveform
represents
360°,
the
oscilloscope
graticule
can
be
calibrated
in
degrees/
div
by
using
the
TIME/DIV
switch
and
its
VARIABLE
control.
Adjust
the
span
of
a
reference
waveform
so
that
1
cycle
covers
a
given
number
of
div.
Figure
15
illustrates
how
the
graticule
can
be
calibrated
for
45°
/div.
The
phase
difference
of
the
signal
from
the
reference
equals
the
dis
placement
from
the
calibrated
point
on
the
graticule.
When
making
phase
measurements,
maintain
a
constant
amplitude
point
on
the
input
trigger
signal
so
that
the
two
input
signals
are
compared
indirectly
to
this
reference
and
directly
to
each
other.
The
trigger
signal
must
have
suffi
cient
amplitude
to
insure
stable
triggering
and
must
be
frequency
related
to
the
waveforms
on
which
the
phase
measurements
are
being
made;
however,
the
phase
of
the
triggering
signal
is
not
critical.
It
is
essential
that
after
triggering
c
o
nditions
have
been
established,
there
is
no
change
during
any
phase
measurement.
The
display
amplitude
should
be
large
for
maximum
ac
curacy.
Accuracy
of
measurement
also
depends
on
keep
ing
the
waveform
centered
about
the
graticule
horizontal
centerline.
HOW
TO
MAKE
DUAL-TRACE
PHASE
MEASUREMENTS
Phase
comparison
between
two
signals
of
the
same
frequency
can
be
made
(up
to
the
frequency
limits
of
the
vertical
system)
using
the
dual-trace
feature
of
the
314
as
follows:
a.
Press
ALT
or
CHOP
buttons
in,
depending
on
the
fre
quency
of
the
signal
being
measured.
b.
Set
the
VOLTS/DIV
switches
and
VARIABLE
controls
of
both
channels
to
display
4
or
5
div
of
vertical
display.
c.
Connect
the
reference
signal
to
CH
1
input
and
press
INT
and
AC
buttons
in.
d.
Connect
the
signal
to
be
compared
to
CH
2.
If
the
signals
are
of
opposite
polarity,
press
CH
2
INVERT
button
in
(take
the
polarity
inversion
into
consideration
when
cal
culating
total
phase
difference).
e.
Set
LEVEL
control
for
a
stable
display
and
set
TIME/DIV
switch
to
display
about
1
cycle
of
the
signal.
Position
the
display
to
graticule
center.
f.
Turn
TIME/DIV
VARIABLE
control
until
1
cycle
of
the
reference
signal
(CH
1)
occupies
exactly
8
horizontal
div.
18
314
Operators

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Tektronix 314 Specifications

General IconGeneral
BrandTektronix
Model314
CategoryTest Equipment
LanguageEnglish

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