Tektronix 2235 Operator's Manual

O perating Proce d ures-2235 ΑΝ /USM-488
Operators
b etween two separate events . To measure time d ifference,
use the following proce d ure :
1 . Preset instrument controls and obtain α b aseline
trace, then set the Α TRIGGER SOURCE switch to CH 1 .
2 . Set b oth I nput Coupling switches to the same posi-
tion, depend ing on the type of input coupling desired .
3 . U sing either probes or cables with equal time d elays,
connect α k nown reference signal to the Channel 1 input
and the com p arison signal to the Channel 2 in p ut .
4 .
Set both VOLTS/DIV switches for 4- or 5-division
d isplays .
F igure 4-8 . Time d ifference
between pulses on time-related
5 . Select BOTH VERTICAL MODE ; then select either

signals .
ALT
or
CHOP,
depending on the frequency of input signals .
6 .
If
the two
signals
are of opposite p olarity, pull out the
Channel 2 P OSITION control knob to invert the Channel 2
d isplay (signals may b e of opposite polarity due to 180°
phase d ifference) .
7 . Adjust the Α TRIGGER LEVEL control
for α stable
display .
8 . Set the Α S EC/DIV switch
to α sweep speed which
provi d es three or more
d
ivisions
of horizontal separation be-
tween the reference p oints
on
the two
displays . Center each
of
the
displays vertically (see F igure 4-8) .
9 . M easure the horizontal
difference b etween the two
signal reference p oints an d calculate the time
d ifference us-
ing the following formula :
Α
S
EC/DIV

horizontal
Time

=

switch

χ d ifference

4 . Select BOTH VERTICAL MODE ; then select either
Difference

setting

(divisions)

ALT or CHOP, d epen d ing on the frequency of input signals .
magnification factor

The reference signal shoul d precede the com p arison signal
in time .
E XAMPLE
:
The Α S EC/DIV switch is set to 50 μ s p er
d
ivision,
the
Χ
10 M agnifier is on (knob out) and the h ori-
zontal
difference b etween waveform measurement
p
oints
is
4
.5
divisions
.
Substituting the given values in t he formula :
CHANNEL 1 (REFERENCE)

CHANNEL
2
loo . .

. .

. .

. .
ι
9o-
50% ι
AMPLITUDE
Β
MEASURE
LEVEL

TIME FROM
ΟΑ TO
Phase Difference
HORIZONTAL ;
~ Ι DIFFERENCE
In
α similar manner to "Time Difference B
etween Pulses
on Time-Relate d Signals,"
phase com
p
arison between two
signals of the same frequency
can be made
using
the dual-
trace feature of the instrument . This metho d of
phase d iffer-
ence measurement can be use d up to the frequency limit of
the vertical d eflection system .
To make α p hase compari-
son, use the following p
roce d ure :
1 . P reset instrument controls an d o btain α b aseline
trace, then set the V ertical TRIGGER SOURCE
switches to
CH 1 .
2 . Set both I nput Coupling
switches to the same p osi-
tion, d epen d ing
on
the type of input coupling d esired .
3 . U sing either probes or cables with e qual time delays,
connect α known reference signal to the Channel 1 input
an d the u nknown signal to the Channel 2 input .
5 . If the two signals are of opposite polarity, pull out the
Channel 2 P OSITION control k nob to invert the Channel 2
display .
Time

_ 50 _

μ s/ d
iv χ 4
.5 d
iv _
Difference

10

-
22
.5 ~ ι s

trols so the d isplays are equal in amplitude .
C42a7 -1
α
6 . Set b oth VOLTS/DIV switches and b oth Variable con-

Tektronix 2235 Specifications

General

Brand	Tektronix
Model	2235
Category	Test Equipment
Language	English