Tektronix 2235 Operator's Manual

M agnifie d Sweep Ru ns Afte r Delay
T he following pr ocedu r e ex p lai ns how to ope r ate t he Β
Sweep i n α n ontriggere d mo de and to d etermi n e t he res u lt-
ing app arent magnification factor .
1 .
Preset
i n
st
r
ume
n t con t r ols and obtain α baseline
trace .
2 . A pp
ly
t
h
e
sig n
al to
eit h
er
vertical ch
a
nn el i np
ut
con -
nector
and set t h e VER TICA L M OD E switch to d is p lay t he
c
hannel u sed .
3 .
Set t he app ro pr iate V O L TS/DI V switc h to p roduce α
d isplay of a pp roximately 2 o r 3 d ivisio ns i n am p litu de and
center t h e d isplay .
4 . Set t he Α SE C/DI V switch to α sweep spee d w h ic h
d is p lays
at least one com p lete waveform cycle .
5 . Select A LT H OR IZO NTAL M OD E . Ad j ust bot h t h e
a ppr op r iate ch annel POSITIO N control and t he Α / Β S WP
S EP con t r ol to dis p lay t h e Α trace above t he Β t r ace .
6 . Ad j ust t he ΒD ELAY TIME POSITIO N control to posi-
tio n t he start of t h e intensified zone to t h e p ortio n of t h e

P
ulse
J itte r Time M eas ur eme n t
d isplay to be mag n ifie d (see Fig u re 4-11) .
7 . Set t he Β S E C/DI V switc h to α setti ng w h ic h i n te n si-
fies t he f u ll portion of t he Α trace to be mag n ifie d . T h e i n te n -
sified zone will be dis p laye d as t h eΒ trace (see Fig u re 4-11) .
T he Β HO R IZO N TA L M OD E may also be used to magnify
t he i n te n sified p o r tio n of t he Α Swee p .
8 . T he a pp arent sweep magnification can be calculated
from t he followi n g fo r mula :
Apparent

Α SE C / DI V s witc h setti ng
Delayed Swee p =
M agn ificatio n

Β S E C/DI V switc h setti n g
EXA MPLE : Determine t h e app arent magnification of α
dis p lay wit h an Α SE C/DI V switc h setti ng of 0 .1 ms pe r
d ivision an dα Β SE C/DI V switc h setting of 1 μ s per
d ivision
.
O p e r ati ng Pr ocedures-2235 ΑΝ / US M -488 O p erators
EM
MKINUEN
( Β ) Β DEL AY E D DIS PL AY
Figu r e 4-11 . Delaye d -sweep m agn ificatio n .
To meas u re pu lse j itter time :
1 . Perfo r m ste ps 1 t hr oug h 7 of t he pr ecedi ng " M agni-
fie d Swee p Ru ns After Delay" pr ocedu r e .
2 . R eferri ng to F igure 4-12, measu r e t he d iffe r ence be-
tween Point C an d Point D in d ivisio ns an d calc u late t h e
p ulse j itter time using t h e following form u la :
Pulse

Ho r izo n tal

ΒS E C/DI V
J itter = d iffere n ce χ

switc h
Time (divisions) setting
Triggere d M agnifie d Sweep
04207 -21
T h e followi ng p rocedure ex p lai ns h ow to o pe r ate t he Β
Sweep i n α triggere d mo de a nd to d etermi n e t he res u lti ng
ap parent
magnification
factor . Operating
t h
e
Β
Sweep
in
α
t r igge r ed mode pr ovides α more stable dis p lay, since t he
delaye d dis p lay is tr iggered at t
h
e same p oi
n
t eac
h
time .
S ub stit u ti ng t he given values :
A pp a r e n t

_ 1 χ 10-4
=
10
2 =
100

1 . Perform
ste p s
1 t h ro u gh 7 of t h e_

prece d ing " M agn i-
M agn ification

1 x10
-6

fied Swee p
R
uns
After Delay" p r ocedu r e .

Tektronix 2235 Specifications

General

Bandwidth	100 MHz
Channels	2
Vertical Sensitivity	2 mV/div to 5 V/div
Maximum Input Voltage	400 V (DC + AC peak)
Rise Time	3.5 ns
Vertical Resolution	8 bit
Input Impedance	1 MΩ || 20 pF
Power Requirements	90 to 250 V AC, 48 to 440 Hz
Trigger Modes	Auto, Normal, Single
Display	CRT
Weight	17 lb (7.7 kg)