Tektronix T922 User Manual

Operating Instructions-T921/T922/T922R
6 . Turn the variable (X1 - X10)
SEC/DIV control until
one cycle of the reference signal
(Channel 1) occupies
exactly
eight divisions between the first and
ninth
graticule lines
(see Fig . 2-14) . Each division of the
graticule represents 45°
of
the
cycle (360 0 - 8 divisions =
45°/ division) .
7 .
Measure the horizontal difference between
cor-
responding points
on the waveforms .
8 . Multiply the
measured distance (in divisions) by
45°/ division (sweep
rate) to obtain the exact amount of
phase difference .
Example :
Assume a horizontal
difference of 0 .6 divisions with a
sweep rate of 45° division
as shown in Fig
.
2-14 .
Substituting the given
values :
Phase

=
0
.6 division x

45°/division
Difference
Phase Difference = -

270
Time Duration and Frequency Measurements
To find the time duration between 2 points on a
waveform,
multiply the horizontal distance (in divisions)
between the 2 points by the SEC/DIV switch
setting .
Frequency (in hertz) is the reciprocal of the time duration
of one cycle (in seconds) .
CHANNEL1
CHANNEL2
(REFERENCE)
/-(LAGGING)
MEASURE
TIME
FROM
A
TO
B
HORIZONTAL
DIFFERENCE
8
DIVISIONS
(3600)

465/DM-O-15
2- 1 6
Fig .
2-14 . Phase difference
.
Example :
The horizontal distance measured is 8 .3 divisions (see
Fig . 2-15) .
The
SEC/DIV
switch is set to
2
ms .
Substituting the given values :
Time Horizontal
SEC/DIV
Duration = distance x
(divisions)
Time __ 8 .3

2
Duration divisions ms/division
Time
Duration
and
Frequency =

1
time duration
Frequency

=

1

=

60 Hz
16 .6 ms'
'16
.6 ms = .0166 seconds
Risetime Measurements
= 16 .6 m (milliseconds)
Risetime measurements are made in the same manner
as time duration measurements, except the
measurements are made between the 10%and 90%points
of the waveform's amplitude (see percentage markings on
the left edge of the graticule) .
,0 0
.
.
90
i
momWOMMIN
mom
11r :~
HORIZONTAL
DISTANCE
1738-20
Fig . 2-15 . Time duration .
setting

Tektronix T922 Specifications

General

Brand	Tektronix
Model	T922
Category	Test Equipment
Language	English