Tektronix 533 User manual

..
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INSTRUCTION
MANUAL
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I
Tektronix, Inc.
S.W . Millika n Way P. 0. Box 500 Beaver t on , Or e go n 97 005 Phon e 644 -01 61 Cab l es : Tekt ro ni x
070- 258

Type 533/533A
WARRANTY
All Tektronix instruments are warranted
against defective materials and workman -
ship
for one year. Tektronix transformers,
manufactured in our own plant, are war-
ranted for the life of the instrument.
Any questions with respect to the war-
ranty mentioned above should be taken up
with your Tektronix Field Engineer.
Tektronix
repair and replacement-part
service is geared directly to the field, there-
fore all requests for repairs and replace-
ment parts should be directed to the Tek-
tronix Field
Office or Representative in your
area. This procedure will assure you the
fastest possible service. Please include the
instrument Type and Serial number with all
requests for parts or service.
Specifications
and price change priv-
ileges reserved.
Copyright ©
1961 by Tektronix, Inc.,
Beaverton,
Oregon. Printed in the United
States of America. All rights reserved. Con-
tents of this publication may not be repro-
duced in any form without permission of
the copyright owner.
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CONTENTS
Section Specifications
Section 2
Operating
Instructions
Section 3
Applications
Section 4 Circuit Description
Section 5
Maintenance
Section 6
Calibration
Procedure
Section 7 Parts
List and Diagrams
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Type 533/533A

Type 533/533A
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General
The Tektronix Type 533/533A Oscilloscopes are general
purpose instruments well suited to laboratory use. Plug-in
preamplifiers
are used in the vedical-deflection system,
permitting the instruments to be used
in many specialized
applications, including, among others, wide
band, dual
trace, low level, differential, maximum frequency response
and risetime,
and transistor risetime checking. Specifica-
tions listed below apply to both the Type 533 and Type
533A, except in cases that are otherwise noted.
Vertical Deflection System
All specifications for the Vertical Deflection System of
the Type 533 and 533A Oscilloscopes depend upon the
plug-in unit used with the instrument. The following speci-
fications
are given assuming that a Type K plug-in unit is
used.
Bandpass -
DC to 15 me (down 3 dB ± ½ dB at 15 me).
Risetime -.024 microseconds.
Delay
Line - Balanced network Signal Delay- 0.2 þÿ¼sec.
Horizontal Deflection System
Triggering Modes-Type 533, Automatic, AC Fast, AC
Slow,
DC and High Frequency Sync. Type 533A, Auto-
matic, AC
Low Frequency Reject, AC, DC and High
Frequency Sync.
Triggering Signal Requirements
Internal-a si_gnal producing 2 mm of vertical deflec-
tion except 4 mm in automatic and DC modes.
External-a signal of .2 volts to l O volts, peak to
peak. [The sweep will trigger on larger signals,
but the TRIGGERING LEVEL control operates over
a ± 10 volt range.) Automatic mode requires 0.4 V.
Triggering Frequency Range-triggered operation to
5 me.
Synchronizing Signal Requirements
Internal - a signal producing 2 cm of vertical deflection.
External - a signal of 2 volts.
Synchronizing Frequency
Range -- synchronized opera-
tion 5 me to 30 me.
Sweep Rates
Twenty-four position switch provides calibrated sweep
rates from .1 µsec/cm to 5 sec/cm. Accuracy typically with-
in 1% of full scale; in all cases within 3% of full scale.
SECTION 1
SPECIFICATIONS
Continuously variable sweep rates are available from
.l
µsec/cm to 12 sec/.cm
Magnifier
Six degrees of sweep magnification are provided; 2, 5,
10, 20, 50
and 100 times. Accuracy within 5% when the
magnified sweep does not exceed the maximum calibrated
rate of 0.02 microseconds/cm.
Unblanking
DC Coupling
External Horizontal Signal Input
Deflection Factor- Three calibrated ranges, .1 v/cm, 1
v/cm and 10 v/cm. Continuously variable between ranges.
Frequency range -DC to 500 KC in calibrated position.
Input
impedance - approximately 40 þÿ¼¼F paralleled by
megohm.
OTHER CHARACTERISTICS
Cathode-Ray Tube
Type T533P2-PI, P7 and PII phosphors optional.
Accelerating potential -10,000 volts.
Vertical Deflection
Factor- approx. 10 v /cm.
Horizontal Deflection Factor- approx. 28 v /cm.
Voltage Calibrator
Square-wave output at approximately 1 kc.
Output Voltages -0.2 millivolts to 100 volts peak-to-
peak in l 8 calibrated steps.
Accuracy - peak-to-peak amplitude of square waves
within 3% of indicated voltage.
Power Supplies
Electronically regulated for stable operation with widely
varying line voltages and loads.
Line voltage requirements -108, 1l 5, 122, 216, 230 or
244 v, (±9% on each range) 50 to 60 cycles.
Power- 500 watts with Type CA Plug-In Unit.
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Specifications -Type 533/533A
Sweep Time
I
I I -
20 - 30 Volts
I I
Output
/I
/
\ I
I
l7 ' /
0 Valts
7 V V
Swee
p
Time
Sawtooth Output
(Waveforms Displayed on Screen) Vertical Signal Output
Fig . 1- 1. Output waveforms available at the oscilloscope front panel.
Output Waveforms Available
+ Gate Output - approximately 20 volts pea k-to- peak
with same duration as sweep.
Sawtooth Output- Sweep sawtooth waveform, approxi-
mately 130 volts peak to peak.
Vertical Sign al Output - outp ut from ver tical deflection
system, approximately 1.5 volts peak to peak per centi-
me te r of vertical deflection.
Mechanical Specifications
Ventilation -filtered, forced air. Thermal re l ay inter-
rupts instrument
power in the event of ov e rheating.
Finish - photoetched, anodized panels . Blue finish, per -
forated cabinets.
Construction - aluminum allo y chassis and three-piece
cabinet .
Dimensions-
24" long, 13" wide, 16¾" high.
Weigh t - 61 ½ pounds.
Accessories
2 - Type P6006 Probes, 010-127
l - BNC to BNC Patch Cord, 012-0087-00
l - BNC
to Banana Jack, 012-0091-00
l - BNC
to Post Jack, 012 -0092-00
1-
Smoke Gray Filter, 378-0567-00
l - 3
to 2-Wire Adapter, 103-013
l -
3-conductor power cord, 161-010
2 - Instruction
Manuals
Fig. 1-2 . Type 533/533A Oscilloscope dimensions .
1-2 FREE
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Specifications-Type 533 / 533A
TABLE 1
PLUG-IN PREAMPLIFIER CHARACTERISTICS FOR TYPE 5 33/533A OSCILLOSCOPES
CALIBRATED INPUT
PLUG-IN TYPE DEFLECTION FACTOR PASSBAND RISETIME CAPACITANCE
TYPE A
Wide-Band 0.02 v/cm to 20 v/cm de to 14 me 25 nsec 47 pf
DC Coupled .
TYPE B 5 mv/cm to 0.05
v/cm
2 c to 10 me 35 nsec 47 pf
Wide-Band
High-Gain
0.05v/cm to 20v/cm de to 14 me 25 ns ec
DC Coupled
TYPE CA
Dual-Trace 0.05 v/cm to 20 v/cm de to 13 me 27 nsec 20 pf
DC Coupled
TYPED
High-Gain 1 mv/cm to 50 v/cm t de
to 2 me 0.18 µsec
47 pf
DC Coupled
DifferentiaI
TYPE E
Low-Level
50 µV/cm to 10 mv/cm 0.06 cycles to 60
kc 6 µsec 50 pf
AC Coupled
Differential
TYPE G DC
Wide -Band 0.05
v/cm to 20 v/cm de
to 14 me 25 nsec 47 pf
Coupled
DifferentiaI
TYPE H
DC Coupled
5mv/cm to 20v/cm
de to 11 me
31 nsec 47 pf
High-Gain
Wide-Band
TYPE -K
Fast-Rise 0.05 v/cm to 20 v/cm de to 15
me 24 nsec 20 pf
DC Coupled
T YPE L 5 mv/cm to 2 v/cm 3 c to 14
me 25 nsec 20 pf
Fast-Rise
High-Gain 0.05 v/cm
to 20 v/cm
de to 15 me 24 nsec
DC Coupled
TYPE N*
lO mv/cm 600
me
0.6 nsec Input Impedance,
Pulse Sampling 50 ohms
TYPE P* is a fast-rise
step -function test signal
un it .
TYPE Q* 10 µ. stra in/ d iv
de to 6 kc
60 µsec
Adjustable
Strain Gage
to 10,000 µstrain/div
TYPE R*
0.5 ma/cm to 100 ma/cm
23 nsec
Transistor Risetim e
TYPE S*
Semiconductor 0.05 v/cm
and 0.5 v/cm
Diode Recovery
TYPE T*
Tim e-Base
Generator
TYPE Z*
DC Coupled 0.05
v/cm
to 25 v/cm
Differential
de to 10 me
35 nsec 24 pf
Comparator
*More
data available on th e special-purpose plug-in units in the following paragraphs.
t At sensitivities gr e at er than .05 v/cm, maximum bandpass is less than 2 me. At l mv/cm, it is approximately 350 kc.
1-3

Specifications-Type 533/ 533A
Type N
The Type N Sampling Un it is desig ned fo r use with
Tektronix plug-in
type oscilloscopes. The sampling system
thus
fo rm ed permits the display of repetitive signals with
fractional nanosecond (10 9 second or nsec) risetime. By
taking successive samples
at a slightly l ater time at each
recurrence
of the pulse under observation, the T ype N
reconstructs the pulse
on a rela tively l ong time-base. Speci-
fi
catio ns of the. T ype N include a risetime of 0.6 ns ec, co r-
responding
to a maximum bandpas s of appr ox imately
600 me; a sensitivity of 10 mv/ cm with 2 mv or less noise;
and a dynamic rang e of ±120 mv minimum linear range
befor e overloading resul ts .
Accidental
overload of ±4 volts de is permiss ib le.
Type P
The Type P Plu g-In Unit generates a fast-rise step-
function test sig
na l of k nown waveform, simulating the
o
utput of an ideally compensated Ty pe K Unit driv en
wit h a Tektronix Type 107 Squa re-Wave Gene rat or. The
Typ e P permits the st an d ardizati on of the main-unit vertical
amplifier tran sie nt respon se of a Tekt ron ix conv ert ib le
oscilloscope. Risetime
of the T ype P is appr ox imat ely 4
nanosecon
ds when it is used to standardize a Ty pe 53 0-
Seri
es Osc il loscope. Puls e repetition rate is 240 step func-
tions p
er second, wi th either posi ti ve or negative polarity.
St ep function am plitude is continuously adjus tabl e betw een
0
an d 3 major graticul e divi sions.
Type Q
The Ty pe Q Plug-In Un it permi ts any Tektronix co nvert-
ible oscilloscope suc h as the T ype 533/533A to be ope rat ed
with strain gages and other transducers. Excitation volt -
ag es for the strain gages and tr ansducers ar e pro vid ed
by the plu g- in unit. The unit provides high g ain, l ow noise,
and extr emely low drift . Frequency response of the T ype Q
Plug-In Unit is DC to 6 kc; ri se time is approximately 60
microseconds. Strain
se nsi tivity is calib rat ed in 10 st eps
from 10 microstrain per majo r graticu le division to 10,000
microstrcin per division,
and is continuously var iable be-
tween steps.
Type R
T he Type R Pl ug -In Unit is a combined power s upply
and pulse generat or which is used to measure the high-
fr equency characteristi cs of junction transistors by the pulse-
response
method . Wh en the Typ e R is used in an osc illo -
s
co pe h aving a de lay line; de l ay time, risetime, stora ge
time, and falltime may be di sp lay ed simultaneously. A
pus
hbutton switch connec ts a front - pa nel terminal dir ec tly
to the input of the o sci ll oscope for observing exte rnally
derived waveforms .
Pul se ri se time of the Type R Unit is l ess t han 5 nano -
seconds,
so measurements depend on the r is etime of the
oscilloscope used.
Puls e amplitudes are 8 fix e d, ca librat ed
st e ps from .05 to 10 volts, adjustabl e between steps. Pulse
recurrence
freque n cy is 120 pul ses per seco nd .
Type S
The Type S Plug-In Unit is designed for use wi th Tek-
tronix Wid e-Band convertible oscilloscopes. The sl ower
risetime of the Tektron ix 530-Series Osc ill oscopes will af -
fect the
abi li ty of the S Unit to anal yze fast semiconductor
diodes. U
si ng the Type S, voltage across a test diode is
displayed as a function of time.
Ce
rt ain diode parameters, such as junction resistance,
junction c
apacitance , and the st ored c harg e at the ju nc-
tion, can
be measured re ad i ly and rel iab ly from the dis-
pl
ay. Performance of a d io de in a particular circuit can
be predicted by analyzing the recovery and "turn-on"
characteris ti cs. Si nce it is essentially a means for plott ing
voltage across an eleme nt while passing consta nt curre nt
through it, the unit can be used for other app lications as
we ll. For examp le: observi ng the junction characteristics
of transistors, or measuring the res is tance, capacitance or
inductan ce of c ir cu it components.
The
Type S offers calibra ted forward currents in f ive
fix ed ste ps from l to 20 milliamps , and r ev er se currents
calibrated in six steps from O to 2 mi ll iamp s. Di ode shu nt
capacitance is 9 picofarads, and deflection fact ors are
0.05 v/cm and 0.5 v /c m, calibrated .
Type T
The Type T Time-Base Gen erat or provides sawtooth
sweep
vo ltages from 0.2 þÿ¼sec/div. T he trigg er source
may be line frequency, extern al, ac or de coupled, auto -
matic or high-freque n cy syn c. Th e tri gge ring point can
be on either rising
or fa lli ng slope of the wavefor m, and
triggering le vel is adjust ab le . A signal of 0.2 to 50 vo lt s
is requ ir ed for triggering.
Type Z
The Type Z Plug-In ext ends the acc uracy of oscillos cop e
voltag e measurements. It can be used in three modes of
ope rat ion: (1) as a conve nt i onal pr eampl ifier, (2) as a
diff ere ntial input pre amplifier, or (3) as a cal ibrat ed dif -
feren
tial comparator. With sensit iv i ty of 50 mv/cm and
insertion voltage range of ±100 volts, th e effective sc ale
r an ge is +2000 cm . Maximum resolution of the T ype Z
Unit is .005%.
As a
co nvention al preamplifier, the Type Z U nit offers
a passba
nd of de to 10 me for the 533/533A for signals
that
do not oversc an the screen. The de flection factors
ar e 0.05 v olts/cm to 25 v/ cm in 9 fixed, calibra ted steps.
As a
differ ential input pr e ampl ifier, the Typ e Z ac ce pts
a
co mmon-mode si gnal level ±100 volts with i nput at-
te
nuation Xl , and offe rs a common-mode rejection ratio
of 40,000 to l. Maxi mum in put signal is l volt/7 nsec, or
- 1 volt/5 nsec.
As a
calibrat ed diff e rential co mparator , the Type Z
mak es av ailabl e three compar ison volt age rang es; from
zero to ± l volt, z ero to ± l O volts, and zero to ±100
vo l ts.
1-4
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General
The T ype 533/533A Osc illoscopes are ext remely ve r sa tile
instruments which a
re adaptable to a great number of
applicat io ns. H oweve r, to make fu ll use of the instru-
ments, it's
important that you unde r stand the operat i on
and function of the various controls . This section of the
Manual is designa ted to give you this information.
PRELIMINARY INSTRUCTIONS
Cooling
A fan maintains safe ope ra ting temperat ure in the T ype
533/533A by circulating fi ltered air over the rectifiers and
other components. When in ope ration , the ins tr u ment must
be placed so that the a ir intake at the back is clear of
any obstruction that might im pede the flow of air. Side
panels
should also be in pl ace for proper air c ir cu lation.
Th e air fil te r sh ou ld be kept clean, in accordance with
cleaning instructi ons found in the Maintenance Section
of the manua l.
U nder no circu mstances shou ld your Ty pe 533/533A
oscill oscope be operated wit hout the fan run ning . With-
out t he fan, in side te mp er ature of the oscilloscope will
rise
to a dangerous level in five to ten minutes. In this
event, the thermal cutout sw itch wil: disconnect the pow er
and keep it discon nected until t he temperatur e drops to
a safe level.
Power Requirements
Unless tagged otherwise, this in strument is con nected
at the factory for operation at l 05 to 125 volts, 50 to 60
cycles ac ( 11 7 volts nominal.) Ho weve r, p ro visions are
made for e asy conversion to operation at 210 to 250
volts, 50 to 60 cycles (234 volts nominal).
The
power transformer (T700 in Ty pe 533, T601 in Type
533A) is provid ed with split i nput windings, normally con-
nected in paral lel for 117-volt operat i on, but which can
be connected in se ri es for 234 - vo lt operation . Each of these
split windings termina tes in a nest of four terminal lugs
(arranged in a square) on the unders id e of the trans -
former. The l
ugs are numbered l, 2, 3 and 4 in a cloc k-
wise rotation.
SECTION 2
OPERATING
INSTRUCTIONS
Te rminals l a nd 3 are connecte d to one winding and
ter minals 2 and 4 are connected to the second windin g.
T he ac i nput l eads are connected to terminals l and 4
for both 117-volt and 234-volt operation , so t hese con-
n
ection s do not have to be changed when converting
from
one line vol ta ge to the othe r.
When wired for 117-volt ope ration, ter minals l and 2
are jo in ed by a bar e bus wire, and terminals 3 and 4 are
similarly j oi n ed, as shown in Fig. 2-1 a. To convert
th
ese terminals, substitute a s in gle c onnecting wire be-
tween t erminals 2 and 3, as shown in Fig. 2-1 b.
• • • • • • • • • •
• • • • • • • • • •
(a) (b)
• • • • • • • • • •
• 2 3 • • •
2 -- 3
• •
• 4 • • • 4 • •
117V
234V
AC
AC
Fig. 2-1. Converting the pow er transform er from 105 -1 25
volt
operation to 210-250 vo lt operation.
FOR 234-V OPERATION
Fig. 2-2. Converting the T ype 533 fan motor from l 05-125 to
21 0-250 vo lt operation.
2-1

Operating Instructions- Type 533/533A
Fan Connections
Th e cooling fan is powered by a 11 7-volt a c motor.
If the instrument is converted to operate from a 234-volt
l in e, a change in the fan wiring must be made so that it
operates from a 117-volt source.
In Type 533 Oscilloscopes, the leads t hat con nect to
the fan motor terminate in a four-terminal ceramic strip
adja cent to the p owe r t ra nsfo rm er an d to R724. The bla ck
wire closest to R724 is connec ted by a nother wire to termi-
nal 3
of the p ower transformer for b oth 11 7-v olt and 234 -
volt o
pe ra tio n. This wire does not have to be chang ed
when conver ting from one line volt ag e to the other.
Th e other black wire should be lift ed free of the notch
in which it is
soldered and m ove d on e n otch clo ser to
R724 , as shown in Fig. 2-2.
Th e Type 533A instruments, to make the c han ge from
117-volt to 234-volt o peration, refer to the ceramic strip
adjacent to o ne co rner of the p ower transformer, a s shown
in Fig. 2-3. Unsolder the fan l ead in the fifth s lo t at the
ceramic strip, lift it free, and move it to the third slot as
illustrated by t he dotted line in Fig. 2-3. Use silver-
bearing solder to solder the lead into the slot. The other
fan lead connected at the second slot is no t changed
during the co nversion from one l ine voltage to the other.
Fig. 2-3 . Converting the Type 533A fan motor from 105- 125 to
210-250 volt ope r ation .
Fuse Data
Fu se data is silk- scree ned on the r ear panel of the in-
strument adjacent to the fuse holde r. U se on ly the rec-
ommended fuses for maximum o ver -cu rrent protection.
OSCILLOSCOPE OPERATION INFORMATION
Plug-In Units
The Ty pe 533 and 533A Osci llosco pes ore designed to
ope
rat e with an y one of the Tektronix letter-series plug-in
units. The partic ul ar plug- in unit used must be selected
by you to satisfy the re quir ements of your appl ication. In
se le ct i ng the plug-in unit for any pa rticular appli c ation ,
you mu st consider the bandpass, sensit ivi ty, and type of
i nput required for that app l icat ion. Co m plet e informati on
on
a ll available plug-in units will be found in the Specifi-
cations Section of this manual.
Fig. 2-4. In serti ng the selected plug-in unit into the oscilloscope
plug-in compartment.
Preparation for use
When the plug-in unit ha s been selected , insert it in to
the plug-in com par tme nt of the osc i lloscope a nd press
firmly
to insure tha t the connectors mak e pr ope r co nta ct
(see Fig. 2-4). Tighten t he plug-in unit locking control to
hold the unit securely in plac e and turn the oscilloscope
INTEN SI TY control fu ll y counterclockwise. Connect the
pow er cord to the rear of the instru me nt and to t he power
line an d place the POWER switch in t he ON position.
Time Delay
Time delay re la ys used in the Type 533 an d 533A Os -
cillos
copes del ay operation of the instrument for approxi-
mately 25 seconds after the POWER switch is turned on
to allow a brief tube warmup p eriod . The de l ay allo ws
the tube sufficient time to heat before the de op e ra t in g
voltages ar e appl i ed.
If the a c power is off for o nl y an instant, the norma l
25-second d elay wi ll occur before the instrument returns
to full operation . Th is de l ay w ill occur regardless of
whet her the ac power is off because of a momen tar y
power failure or is turned off with the P OWER switch.
2-2
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Focus and Astigmatism Controls
The FOCUS and ASTIGMATISM controls operate in con-
junction with each other to allow you to obtain a sharp,
clearly defined spot or trace. The proper setting of the
ASTIGMATISM control is obtained by rotating the FOCUS
contro l fully clockwise, setting the HORIZON TAL DISP L AY
switch at EXT., the EXTERNA L HORIZONTAL VOLTS/CM
at 10, and adjusting the INTENSITY control to obtain a
spot on the screen . After positioning the spot to t he center
of the screen, the ASTIGMATISM control is ad j usted for
the most nearly circular spot possible. The FOCUS con-
trol is then adjusted to reduce the spot diameter as much
as possible. You must be certain that all input signals
to the oscilloscope are disconnected when you adjust the
FOCUS and ASTIGMATISM controls.
Intensity Control
The INTENSITY control ,s used to adjust the brightness
of the oscilloscope di sp l ay. This permits you to compen-
sate for changes in brightness resulting from changes in
the sweep triggering rate. T he INTENSI TY control is ro-
tated clockwise to i ncrease brightness and counterclock-
wise to decrease it. Be careful when you use the INTENSITY
control
that the brightness is not turned up to where
it will permanently damage the face of the cathode-ray
tube. If brightness is turned up to the point where a halo
forms around t he spot, it should be turned down immedi-
ately.
Grati cu le Illumination Control
T he gra ticule used with the Type 533/533A Oscilloscop e
is accurately ma r ked with 10 horizontal and 6 ver tical
]-cen
timeter divisi ons with 2-millimeter markings on the
center lines. These graticule markings allow you to m ake
time and voltage measurements from the oscilloscope
screen.
Fig. 2 -5 . Rotat ing the graticu le to ch ange the c ol or of the gr ati-
cule mar kings.
Operating lnshuctions-Type 533/ 533A
The grat icule is il l uminated by two lamps l ocated at
the top edge of the grat icule. The graticule markings can
be made either white or red by positioning the graticu le
so that either the clear bu lb slots or those with red plastic
inserts are next to the bulbs. Generally, the w hi te gra tic ul e
markings are better than the red for photographic pur-
poses.
Graticule illumi nation is ad j usted by the SCALE I LLUM .
control located just under the oscilloscope scr een. Rotat-
i
ng the control clockwise increases the brightness of t he
graticule mark in gs , and turning it counterclockwise de -
c
reases br i ghtness . For convenience in photographing
osc i lloscope disp l ays , the SCALE IL L UM. control is marked
in approximate f-stops. T hese f-stops can be us ed with a
shut
ter speed of 1 second when TRI-X film is used, or wi th
a
shutter speed of 10 seconds when Polaroid f il m is used.
Regard less of the type of film use d, bet ter results can
generally be obtained with white graticule markings. For
best results, try to match the intensity of t he trace with the
brightness of the graticu le mark i ngs .
Positioning Controls
T hree contro ls are used with the Type 533/533A for
pos itioning the trace on the oscilloscope screen. Two con-
trols are used to se t horizonta l pos itioning of the trace .
The
se are located on the front panel of the instrument.
The third con trol is used to set ver tical positioning, and is
located on the front panel of the pl ug -i n unit used with the
oscilloscope . The Type 53/54C and Type CA Dual-T race
Plug-In Units have t wo Vertical Positioni ng Controls.
The t wo HORI ZONTA L POSITION contro ls cause the
.
trace to move to the right when th ey are ro tated in the
clockwise direc tion and to the left when rotated coun ter-
clockw ise. Toge the r, the two controls ha ve a Iota I pos ition-
ing
range of 12 to 1200 cen timeters, depending upon the
degree of sweep magnification u sed . T he bla ck HORI-
ZONTA L POSITION con trol has app r oxima tely three times
the range of the red VERN I ER control. The fi ne range of
adjustment of the VER N IER contro l makes this control par-
ticularly useful whenever fine horizontal positioning is
requ i red, such as when various positions of sweep magn i-
fication are used .
The vertical positioning control has eno ugh rang e to
a l low the tra ce to be positi oned completely off the top
or bottom of the screen or anywhere in between. The trac e
moves up wh en the con trol is turn ed clockwise and down
wh en the con trol is turned cou nterclockw ise.
Be am Po sition Indic at o rs
Four small indicator lights locate d just above the os-
cillos
co pe sc reen ind icate the position of the spot or trace.
When one of th ese lamp s is lit, it in dicates that the trace
is off-centered in the direction of the arrow . These four
lights
allow you to position t he spot to the center of the
screen even though the intensity is so low that the trace
is not visible. When the sweep is running, t he spot moves
from the left side of the scr een to the right and may cause
both horizontal lamp s to l ight e ach time the s weep runs.
2-3

Operating Instructions -Type 533/533A
Input Signal Connections
The electrical waveform to be observed is appli ed to
one of the plug-in unit input connectors. T he waveform is
then connected through the vertical-deflection system of
the plug-in unit and the oscilloscope to cause the spot
to be deflected ver ticall y and to trace ou t the waveform
on the screen of the crt. The vertical size of the displayed
waveform is adj usted with the plug-in unit VO L TS/CM
switch. The VOLTS/CM switch is an ac cu rately cal ibrated
con tr ol which, whe n used with the g rat icule, allo ws you to
make precise voltage measurements from t he displayed
waveforms. The operation of other plug-in unit controls
varies between plug-in units. For information reg arding
the operation of these controls, refer to the instruction
manual for the plug-in unit you are using.
Certain precautions must be taken when you are con-
necting the oscilloscope to the input signal source to in-
sure that accurate info rmation is obtained from the os-
cilloscope display. This is particu larly true whe n you are
observing low-level signals or waveforms con tain ing h igh
or extremely low frequency components. For app lications
where you are observing l ow-level signals, unshielded
input leads are unsatisfactory because they tend to pick
up stray signals which produce erroneous oscilloscope
displays. Shiel ded cables should be used whenever pos-
Eq ui pment Being Checked.
sible, with the shield connected to the chassis of bot h t he
oscilloscope and the signal source. Regardless of the type
of i nput le ad used, keep them as short as possible.
Distortion of the input waveform may result if very low-
frequency input signals are cc coupled into the oscilloscope,
if high-frequency waveforms are not properly terminated,
or if the input waveform con tain s high-frequency com-
ponents which exceed t he passband of the oscillosco pe
and plug-in unit combination. You must be aware of the
limitat ions of the instrument.
In
analyzing t he displayed waveform, you must consider
the loading effect that the os cilloscope has on the input
signal source. In most cases th is loading effect is negligi-
ble, but in some app lications, loading caus ed by the
oscilloscope may materially alter the results obtained. In
such cas es you may want to use a probe to reduce the
amount of loading .
Use of Probes
Occasionally, connecting the i nput of an osci ll oscope
to a signal source loads the source enough to adv ersely
aff ect both the operation of the source and the waveform
displayed on the osc ill oscope. When this •occurs, both
Probe Tip Connected
To Signal Source.
- ·-
•
---
Fig. 2 -6 . Prop e r connection of probe to the input signal source.
2-4

capacitive and res1st1ve loading due to the oscilloscope
can
be reduced to a negligible value by using an attenu-
ator probe.
In addition to providing isolation of the oscilloscope
from the signal source,
an att enuator probe also decreases
the amplitude of the displayed waveform by the attenua-
tion factor
of the probe. Use of a probe a llows you to
increase the vertical deflection factors
of the oscilloscope
to look at large amp litu de signals which are beyond the
normal
limits of the oscilloscope and plug- in combination.
Signal amplitudes, however,
must be limited to the maxi-
mum allowable value of the probe used.
Before using a probe, you must check (and adjust
if
necessary) the compensation of the probe to prevent dis-
tortion of the
appl ied waveform. To adjust the probe
compensation, place the HORIZONTAL
DISPLAY switch
at NORMAL (Xl), the TIME BASE TRIGGERING MODE
switch
at AUTO, and the TIME BASE TRIGGER SLOPE
switch at +INT. Turn up the intensity until the trace is
visible and connect the probe tip to the CAL OUT con-
nector. Set the
AMPLITUDE CALIBRATOR switch for 2
centimeters of displayed signal. Set the
TIME BASE TIME/
CM switch to display approximately 3 or 4 cycles of the
Calibrator waveform
and adjust the probe compensation
control to obtain flat tops on the displayed Calibrator square
waves
as shown in Fig. 2-7(6).
The method of setting the compensation control depends
on the probe
in use. If your oscilloscope is equipped with
a Type
PSlOA probe, compensation is by means of a
screwdriver adjustment through the hole near the nose end
of the probe body.
If a P6000 type probe is used, it is
necessary to first unlock the Lo cking Sleeve by turning it
counterclockwise. The probe is th en compensated by rotat-
ing the probe body while watching the oscilloscope dis-
play for the desired waveform. When compensation
is
INCORRECT {a)
Operating Instructions -Type 533/533A
HORIZONTAL SWEEP OF CRT BEAM
CRT SCREEN
TRIGGERING WAVEFORM
Fig. 2-8. In triggered sweep operation the horizontal sweep is
started by the triggering waveforms.
completed, carefully turn the Locking Sleeve clockwise to
lock
it without disturbing the adjustment of the probe.
HORIZONTAL DEFLECTION SYSTEM
Trigger Operation
For most uses of the oscilloscope a stable display of
some waveforms
is required. To accomplish this the
Fig. 2-7. When compen s ating the pr obe, it is adjusted to obtain an undistorted
presentation of the cal ibrator square-wave.
FREE SCAN IN THE PUBLIC DOMAIN 2-s

Operating Instru ctions -Type 533/ 533A
oscilloscope can be operated so that the horizontal sweep
starts at a given point on the displayed wavefo rm . This
is known as " triggered" operation. For the present, we
will refer to the starting of the sweep, at the left side of
the graticule, as " triggering '" the sweep.
Triggered operation is useful for observing a waveform
which may occur only once, or which may occur at random
intervals. For any of these uses, the oscilloscope can be
used in such a way that each horizontal sweep is triggered
by some waveform other than the one being observed,
but which bears a time relationship to the observed wave-
form.
T
he waveform used to sta rt the ho rizontal sweep is
called the "trigger in g s igna l", whether it is the waveform
being obse r ved, or some other waveform. T he instructions
that follow tell you how to select this signal. They also
contain information on triggering according to var i ous
modes, depending on the nature of the trigger ing si gnal.
The nomenclature of the various Tr igge ring Mode set-
tings
has been changed b etween the Type 533 and Type
533A Oscilloscopes. H oweve r, t he sw it ches themselves are
the same. In the following descript ive paragraphs , the
names of the Triggering Modes will be given for both
T ype 533 and Type 533A where differences exist. The first
name given will be that for t he Type 533, the second for
the Type 533A.
Selecting the Triggering Signal
1. To trigge r the sweep from the waveform be i ng ob-
served, set the black TRIGGER S LOPE knob to INT. (+
or - ).
2. To trigger the sweep from the powerline wave (as in
the case when observing a waveform which has a time
relationship
to the pow er-line wave), set the black TRIGGER
SLOPE
knob to LINE (+ or -).
3. To trigg er the sweep from some exte rnal waveform
(one having a time relationship to the waveform being
obse rved), connect the source of the triggering signal to
the TRIGGER INPUT connector and set the black TRIGGER
SLOPE
knob to EXT. (+ or - ).
Refer to Fi g. 2-9 for a comp lete pictorial presentation
of the v ariou s triggering source opt ions.
Selecting the Triggering Slope
The horizontal sweep can be triggered on either the
rising (+ slope) or fa lling (- slope) portion of the tr igger-
ing
waveform as det ermi ned by the position of t he TRIG -
GER SLOPE switch. When the switch is in one of the +
positions, the sweep is tr i ggered on the rising portion of
D is pla ye d Wav efor m
2-6
Lin e- Fre qu e ncy Waveform
External Trigg e ring Wav e fo rm
I
Int .
line
•
Ext .
Trigger
Tr i gg er Slope
In put Conn ect or
Switch
O s cill os cop e
Sw e ep Starting
Circu it s
Fig. 2-9. The trig ge ring signa l is se l ecte d from thr ee po ssi bl e sou rc es with t he
TRIGGER SLOPE control.
FREE SCAN IN THE PUBLIC DOMAIN

Operating Instructions - Type 533/533A
Oscilloscope Display
Trigger Slope
+ Slope
--0
\
I
Sweep Triggered on + Slope
Input Waveform
Oscilloscope Display
Trigge• Slope
- Slope
\
J
Sweep Triggered on - Slope
Fig. 2-1 0. Effects on the oscilloscope display produced by + and - settings of
the TRIGGER SLOPE control.
the trigge ring waveform; when the TRIGGER SLOPE switch
is in one
of the -positions, the sweep is tr iggered on
the falling port ion of the waveform. (See F ig. 2-10).
In many applications the tri gger ing slope is not im-
portant, since triggering on either slope will provide a dis-
play which is suitable to the application. However, in
many other cases such as pulse measurements, the trig -
gering slope is very important . If , while us ing a fast sweep,
you wish to see the rise of a pu lse, it wil l be necessary
for you to trigger the sweep on the rising portion of the
waveform by placing the TR IGGER S LOPE switch in one
of the + positions. To observe the fall of a pulse at a fast
sweep speed, it will be necessary to trigger the sweep on
the
falling portion of the waveform by placing the TRIGGER
SLOPE switch in one of the -positions. In either case,
selection of the wrong triggering slope will make it impossi-
ble for you to see the portion of the waveform you want
to check.
Using the STABILITY and TRIGGER LEVEL Con-
trols
Triggered operat io n in all modes except AUTOMAT IC
and HF SY NC may require proper setting of the STABIL-
ITY and TRIGGER LEVEL controls. The TR IGGER LEVEL
control has no effect in either AU T OMATIC or HF SYNC
modes.
T he STABILITY control has a PRESET position at the fully
counterclockwise setting of the control. This position per-
mits proper trigg ering in many app lications wi thout
necessitat ing additiona I adjustment of the ST ABI LI TY control.
If it becomes difficult or impossible for you to obtain
proper triggering with the STABILITY control at PRESET,
you must then adjust t he control. This is done with the
TRIGGERING LEVEL control fully counterclockwise. The
STABILITY control is rotated clockwise from the PRESET
p os it ion until a trace appears on the screen. The proper
Stability setting for a trigge red display is then obtained
by turning the k nob slowly counterclockwise until the trace
just disappear
s.
The TRIGGERING LEVEL control should then be turned
sl owly toward the O position until a stable displ ay appears
on the screen. The TRIGGERING LEVE L co ntrol also de-
termin es the exact point on the tr igge r ing waveform where
tri ggering of the sweep occurs. Turning the control cloc k-
wise causes the sweep to trigger at more positive points
on
the waveform, while turning the control countercloc k-
wise causes the sweep to trigger at more negative po in ts.
If the displayed waveform is vert ically centered under the
grat icule, setting the TRIGGERING LEVEL control at O will
cause the sweep to start at approximately the mid-volt age
point of the waveform, except in DC mode.
FREE SCAN IN PUBLIC DOMAIN
2-7

Operating Instructions -Type 533/533A
2-8
Trigger Slope
Triggering
Sweep Triggers
On+Slope
Trigger Slope
I \ I \
r J J \ I
Waveforms Obtained
With The Triggering
Level Control Set In
The - Region
\
o:
I I \
I \ I I
\_
v· \ I
Waveforms Obtained
With The Triggering
Level Control Set In
The +Region
.I
\ l I .,
Sweep Triggers
On - Slope
Trigger Slope
o:
Sweep Triggers
On+ Slope
Trigger Slope
J I \ / \
I I
Triggering Level
•
0
\V
J
o:
Sweep Triggers
On - Slope
Fig. 2-11 . Effe ct s on the oscillosc ope disploy produc ed by + and s ett ing s of
th e TRIGGERI NG LEVEL c ontro l. When the TR I GGERING LEVEL c ontrol is se t in the
+ r eg ion , the swee p is t riggere d on th e upp er portion of th e input wav e form ;
when it is set in the - r egio n, the sweep is triggered on the lo wer portion of
the input wav e form. The TR IGGER SLOPE control determine s whether the swee p
is
triggered on th e ri s ing portion or the falling porti o n of th e input wav e fo rm.

Selecting the Triggering Mode
After selecting the triggering sou rc e and triggering slope,
it is next necessary to se lect the triggering mode which
will allo w you to obtain the desired display . Five trigger-
ing modes are available . In the Type 533, they are DC,
AC SLOW, AC FAST, AUTOMATIC and HIGH FREQUENCY
SYNC. In the T ype 533A, they are DC, AC, AC LOW
FREQUENCY R EJECT, AUTOMAT IC and HIGH FREQUENCY
SYNC.
Each of the triggering modes is designed to provide
stable triggering from a certain type of waveform. For most
applications however, several of the triggering modes will
work equally well. For applications of this typ e, the trig-
gering mode used is purely a matter of choice. The primary
thing to consider in choosing the tri gge r ing mode is
whether or not it allows you to obtain the di splay you
want.
To determine the best mode of operation for a particular
appl ication, it is usually best to try each trigge ring mode
in the applicat ion. The Automatic mode should be tried
fir st since this triggering mode provide s stable triggering
in most app lications without the necessity of setting the
STABI LITY or TRIGGE RING LE VE L controls. If the Auto-
matic mode does not provide the desired display, it will
then be n ecess ar y for you to try one or more of the other
triggering modes.
AUTOMATIC Triggering Mode
The AU T OMA TI C mode is most frequently used because
of its ease of operation. This mode is useful in ob t aini ng
stable triggering from wavefo r ms with frequencies of from
approximately 60 cycles to 2 megacycles. The princ i pal
advantag e· of this type of operat ion is that it is not nec-
essary to adjust either the ST ABILITY or TRIGGERING
LEVEL controls to obtain a stable display . This permi ts you
to observe a large num ber of waveforms with different
shapes and amplitudes without ad justing any of the trig-
gering controls. In the absence of a triggering signal, the
sweep contin
ues to run to prov ide a convenient reference
trace on
the oscilloscope screen.
The AUTOMAT IC triggering mode is selected by placing
the TRIGGERING MODE switch in the AUTO. position. The
triggering source and slope is then selected and the input
signal is applied to the oscilloscope. No other contro l ad-
justments are required. Since the TRIGGERING LEVEL con-
trol hos no effect on the displ ay when automatic trigger-
ing is used, it is imp ossible to select the point on the t rig-
gering waveform where the sweep is triggered. Each sweep
is instead t riggered at the average voltage paint of the
waveform.
DC Triggering Mode
In the DC mode, the sweep can be triggered fro m peri-
od ic signals in the range from de to 5 me. This mode is
especially useful w it h trigger signals that change slowly,
and is also useful when it is desired to trigger at a certain
point (voltage level) on a waveform with respect to ground.
Another application of the DC triggering mode is to
attain a stable displ ay of a random-pulse train. The aver-
Operating Instructions -Type 533/ 533A
a ge voltage of this type of signal is dependent upon the
time durat ion and amplitude of each pulse and the time
lapse between success ive pul ses. Since these are var i-
able quantities in a random-pulse train, the overage volt -
age will also vary. Th is is likely to cause unstable tr igg er-
ing in the AC modes. In the DC mode, however, the
circuits are sens it ive to the instantaneous vo ltage only.
Changes in the average vol tag e do not alter the operation
of the circuits. As a result, the TRIGGERING LEVEL control
can be adjusted to in itiate a sweep whenever a pulse
reaches the desired voltage.
AC SLOW (AC) Triggering Mode
Se lection of the AC SLOW (AC) trigger ing mode is
made by placing the TRIGGERI NG MODE switch in the
AC SLOW (AC) position. This mode provides useful trig-
gering in the frequency range of approx imately 15 cycles
to 5 me . These frequency limits vary slightly depending
upon the shapes and amplitude of the tri gger ing waveform.
In the AC SL OW or AC mode, tr iggering is unaffected
by the de components of the triggering signal or by the
vertical positioni ng of the trace. The triggering level con
be se lected to prov ide the desired displ ay using the STA -
BILITY and TRIGGERI NG LEVEL controls. Th e se two con-
trols are set as described for the DC mode.
AC FAST (AC LF REJECT! Mode
The AC FAST (AC Low Fr equency Reject) tr igge ring mode
is used when the TR I GGERING MODE switch is in t he AC
FAST (AC LF Rejectl position. This mode is similar to the
slower AC mode except that low -frequency waveforms
are rejected by the trigger i ng cir cu : t. Th is triggering mode
works well with high-frequency wav eforms, but it may be
difficult to obtain stable triggering with frequencies below
approximately 1000 cycl es.
Occasional ly you may be required to obta in stable trig-
gering from a foirly high-frequency waveform that is mixed
with a great deal of low frequency noise or line fr equency
pick up . In such cases the additional noise and pickup con
make it very di ff icult to obtain a stable displ ay . If th is
occurs, you can select the AC FAS T (AC LF REJECT) t rig ger-
ing mode, thereby eliminating the effects of the low fre-
quency no i se and picku p. The low frequencies ore blocked
from the trigge ring circuit while the high frequency trigge r-
ing waveform is passed to produce the stable trigge ring
that you need. In all other respec ts, the two AC trigge ring
modes are identical.
HF SYNC Triggering Mode
The High Frequency Synchronization Mode permits stable
displays of waveforms with frequencies higher than
app r oximately 5 me. Stabil ity of the displ ay is adj usted
with t he STABILITY control. The TR I GGERING LEVEL contr ol
is not used. To use the H igh Fr equency Sync hr onization
Mode, pla ce the TRIGGERI NG MODE switch in the HF
SYNC position. Turn the STAB ILI TY control clockwise until
a trace appears. Continue to adjust the STAB I LITY control
until a stable display is obtained.
2-9

Operating Instructions - Type 533/533A
Although the synchronization signal source is selected
with the TR IGGER SL OPE control, the slope can not be se-
lected. Al so you cannot use the PRESET position of the
STABILITY Control in this mode .
Free-Running Sweep Operation
In the usual oscilloscope application, the sweep is trig -
gered or synchronized by the input waveform . However,
in some applications it may be more desirable to reverse
the process and initiate the input waveform through use
of a periodically recurr ent waveform from the osci llo-
scope. In this type of ap plication the sweep is caused to
free-run and an output from either the + GATE OUT or
SAWTOOTH OUT connectors is used to trigger or syn-
chronize the input waveform.
(See F ig . 2-12).
The sweep can be made to free run w it h a ny setting of
the TR IGGERI NG MODE switch by turni ng the STABI LI TY
control fully clockwise. In all positions of the TR I GGE R-
ING MODE switch except AU T OMATIC the number of
sweeps per second is de termined by the setti ng of the
TI ME/CM controls. In the AUTOMA TI C position, the sweep
repetition rate remai ns at app r ox imately 50 sweeps per
second regardless of the setting of the TIME /CM contro l.
OUTPUT OF THE EX T E RNAL
EQUIPMENT IS APPLIED TO
THE OSCILLOSCOPE INP UT
EQU IPM E NT TO BE T RI GG ERED
OR SYNCHRONIZED BY THE
OSCILLOSCOPE
Fig. 2- 12. Using the Ga te or Sawt oo th outpu t wa vefo rms to sy n-
c hr onize or tri gger exte rnal e qui pment.
In addit ion to pr ovid i ng the means of controlli ng an
app li ed waveform, a free-running sweep also prov ides a
convenient reference trace on the oscilloscope screen with-
out requiring an input signal. This trace can then be used
to position the sweep
or to establish a voltage refer en ce
line.
Sweep Magnificat i on
To magnify a particular p art of a displ ay, pos 1t 1o n that
portion of the display with t he HORI ZON TAL POS ITI ON
controls so that it appea rs near the center of the gra ti cu l e.
Then turn the HORIZO NT AL DI SP L AY control to the desired
SWEEP MAGN IFI ED position. T hat part of t he display
wh ich formerly occupied the midd le section of the gra ti cu le
will now be exp a nded horizontal ly by the selected mag-
nificat ion factor. The apparent time calibration of the X
(sweep) axis will now be equal to the sett ing of t he
TI ME/CM contr ol divided by the magn if ication factor.
External Horizo nt al D efle ct ion
In some instances it may be necessary to deflect the
beam hor i zontal ly by me an s of an externally derived wave -
HORIZONTAL DISPLAY
(a ) Fa st- ri si ng st ep waveform disp l ayed a t N OR MAL sweep se tting
HORIZONTAL DISPLAY
(b)The some wave fo rm disp layed wi th Xl O Mag ni fi cation
(c) original waveform, now magnif ied SO ti mes
H OR IZ ON TA L DISP LAY
(d ) T he orig in al wave f orm, magnified 10 0 t imes
Fig. 2- 13. Eff ects of th e sweep ma g ni fie r control on the sa me
wa veform at vari ou s Mag ni fi ed se ttin gs.
2- 10
FREE SCAN IN PUBLIC DOMAIN

form, rather than by means of the internal sweep. To ac-
complish this, set the HORIZONTAL DISPLAY switch to
EXT. and connect the source of the waveform to the EX-
TERNAL HORIZ. IN connector. Set the EXTERNAL HORI-
ZONTAL controls (VOLTS/CM and VARIABLE) for the de-
sired amount of horizontal deflection. Three ranges of
fixed attenuation (of the external sweep signal) are pro-
vided, with a variable control to interpolate between
ranges.
Output Waveforms
For certain external applications, the sawtooth sweep
wavefo rm is available at the SAWTOOTH OUT connector
on the front panel. This positive waveform starts at about
ground and rises linearly to a peak amplitude of about 150
volts.
The start and duration of the rising part of the sawt ooth
coincides with the start and duration of the horizontal
sweep on the crt. The rate at which the sawtooth rises is
determined by the setting of the TIME/CM control.
A positive rectangular waveform is available at the +
GATE OUT connector. This waveform starts at ground
and rises to about 20 volts. Th e starting time and duration
of each pulse coinc id es with the starting time and duration
of the positive-going part of the sawtooth avai lab le at
the SAWTOOTH OUT co nn ector.
Single Sweep
The Type 533/533A contains a single-sweep (sweep lock-
out) feature which permits a waveform to be displayed for
one hor izontal sweep only. Subsequent sweeps and wave-
form displays are locked out until the circuit is rearmed.
SINGLE-SWEEP PRESENTATION
Operating Instructions - Type 533/ 533A
This feature is particularly useful for photographing random
or nonrepetitive signals.
To use
the single-sweep feature, set the instrument for
norma l manuall y-triggered operation. Click the spring-
loaded NORMAL SWEEP-SINGLE SWEEP switch to the RE-
SET position. Let it return to the SINGLE SWEEP position.
The READY lamp will light. The next trigger pulse will
produce a single hor izontal sweep. Subsequent triggers
will have no effect on the circuit until the READY lamp is
l ighted with the RESET switch.
AUXILIARY FUNCTIONS
Calibrator
The calibrator provides a convenient source of square
waves
of known amplitude at a frequency of approximately
1 kc. The square-waves are used primarily to ad j ust probes
and to ver ify the ca libration of the vertical deflection sys-
tem of the oscilloscope and plug-in unit.
Calibrator square-waves are adjustable from .2 millivolts
peak to peak, to 100 volts peak to peak, in 18 steps. Cali-
brator output amplitude is controlled on the T ype 533 by
two SQUARE-WAVE CALIBRATOR switches on the front
panel. T he large black knob sets nine ranges of output
in increments of from .2 to 100. The sm all er concentric
red knob, labeled VOL TS, MILLIVOLTS, OFF, determines the
proper output in volts or millivolts. On the Type 533A a
single AMPLITUDE CALIBRATOR knob controls the full
range of 18 outputs, ranging in steps from .2 millivolts to
100 vol t s.
The peak to peak calibrator voltage is within 3 percent
of the CALIBRATOR switch setting when the output is
connected to a high imp eda n ce load.
REPETITIVE-SWEEP PRESENTATION
Fig. 2-14. Comparison of single sweep and repetitive sweep presentation of a
damped s ine wave. In the repetitive sweep presentation, it is difficult to determine
what is b eing presented . Ho wever, in the s ingle sweep presentation the damped
sine wav e can be clearly see n.
2-11