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NUMBER 6 PRINTED INu . 5 . ~ F E B R U A R Y 196 1

TYPE 5301540 OR TYPE 530Al540A
SERIES
OSCILLOSCOPES AND COMPOSITE
VIDEO SIGNALS
Part I
Several T V Broadcast Studios have
) t e n using T y p e 530/540 or Type 530A/
i40A Oscilloscopes and trying to trigger
)n a nonintegrated conlposite video sig-
~ a l T h e r e arc three different pulse trains,
.
dl very close in amplitude, a t the start
)f a composite video signal. Most oscil-
oscopes, ~ v h e npresented with this signal,
vill try to trigger on each pulse of the
hree trains. T h e result is an unstable
lisplay.
Television engineers generally will pre-
er the T y p e 521XD over other oscillo-
;copes for viewing the composite video
iignal. T h i s instrument, specifically de-
iigned for television broadcast studio re--
luirements, contains carefully planned
:rigger separator and sync separator cir-
:uits that enable the instrument to trig-
:er reliably on composite video signals.

- ... [ t also provides other characteristics de-
sirable f o r the maintenance antl atljust-
n e n t o f television transmitter and studio
D a m a g e caused in the distribution amplifier of a T y p e 545A Oscilloscope as a re- x1uipment. T h e T y p e 524AD enables the
sult of a shorted crt lead. mgineer to observe any portion of the
.clevision picture-from complete frames
NOTICE! o small portions of individual lines.
IMPORTANT INFORMATION Hoxvever, the T y p e 530/540 or 530A/
A seriously damaged distributed amp- developed a field modification kit thai j40A Series Oscilloscopes give usable rc-
lifier CAN occur in any of the following protects the distributed amplifier fron- Suits if an integrator circuit is employed.
oscilloscopes : damage due the these short circuits. Wc - Isuitable integrator circuit consists of
T y p e 541, all serial numbers above 6565 offer this ~ ~ ~ o t l i f i c a t kitnfree of charge.
io a 10 Ic resistor and a 0.01 capacitor.
T y p e R3141, all serial n u m l ~ e r sabove 111 W e earnestly recommend that ownerr T o use this circuit with these instru-
T y p e 545, all serial numbers above 9720 of these instruments consider the instal. ments, patch the V E R T S I G O U T of the
T y p e RlI45, all serial numbers above 132 lation of this modification a must. oscilloscope to the T R I G G E R I N P U T
Type 54lA, all serial numbers O r d e r the modification kit througl via the integrator circuit.
T y p c R M I l A , all serial numbers your Telitronix Field Engineer. F o r Typc F o r the T y p e 531, 532, 533, 541, antl
T y p c 513, all serial n u m l ~ e r s 551 antl T y p e 555 Oscilloscopes, order 543 o r T y p e 531A, and 541A proceed as
T y p e R I I 4 3 all serial numbers Field 3lodification Kit-"Fuse for P r o follo\vs :
T y p e 545A, all serial numbers tection of the Distributed An~plifier" Step 1. U s e a \vide band Plug-In Pre-
T y p c Rh145h, all serial numbers Tel; num1)cr 010-226. amplifier in the oscilloscope ant1
T y p e 551, all serial numbers For all other instruments listed ahove apply the composite video signal
T y p c 555 all serial numbers order: Field 1Iotlification Kit-"Fuse fo t o the I N P U T . Adjust the
I n these instruments, certain types of Protection o i the Distributed Amplifier" V O L T S / C 1 1 to give 3 or 4
short circuits (such as a crt lead becom- 'Teli number 010-227. centimeters of vertical deflection.
ing disconnectctl antl shorting to ground) Immediate steps are being taken a Step 2. Patch the V E R T S I G O U T to
\\-ill cause the terminating resistor to T e k t r o n i s plants to incorporate thi. the T R I G G E R I S P U T via the
b i ~ r n . Secondary effects caused 1jy the motliiication in all afiectetl protluctio~ integrator circuit. See fig. 1.
burning of these resistors can result in instruments. T h e T y p e of oscilloscop~ Step 3. Set the T I 1 I E / C 1 1 s\\.itch to . i
estetisive damage as sho\vn in the picture and the serial number a t \vhich the motli 11ILLISEC.
above. Repairs in such an event are costly, fication beconic efiective \\-ill be an Sten 4. Set the T R I G G E R S L O P E
both in money antl tlolvn-time for the in- nouncetl in a future issue of SERVICI: sn-itch to - E X T for negative-
strument. This is indeed a regretable S C O P E . F o r the present, please consul going signals o r + E S T for
situation, but one that only time and es- your Telitronis Field Engineer to deter positive-going signals and the
perience in the field with the instrument mine i f instruments you have on orde T R I G G E R M O D E switch to
could have brouglit to light. Since be- o r have recently received are afiectcd b! A C or AC S L O W .
coming a\vare of the difiiculty, Jve have this notice. Step 5. T u r n the S T A B I L I T Y and
'Using Your Oscilloscope T y p e 535X o r instruments. T h e problem is to
T v n e 545.k".
.A
match tile signal source to the ap-
"A limited number of the booklets prosim;lte 900-oIim impetlance of
for tlie T y p e 535 and T y p e 545 a r e the tlistri1,utetl plates. I f any
still ava~lable. Ask your Telitl-onix matcliing dcvice such a s a trans-
Fieltl Engineer for F I P - 1 , "Using former is used, mncli ringing antl
Your T y p e 535 or T y p e 545 Oscil- distortion occnl-s.
loscope. (2. Can you suggest a device for coupl-
ing the output of a sine-\vavc or
TEKTRONIX FIELD MAINTENANCE square-\vavc generator to the P6016
FACILITIES AND SERVICES Current Probc \\-hen testing thc
passl~and or square ~ v a v ercsponsr
T h e Field 3lainteiiance Facilities antl of the ~ S O I X ' :
Srrvices availal~letlirongli your T e k t r o n i s ,\. X 1%" piece of No. 18 solid \\-ire,
Fieltl Engineer are descril)etl in a re- formed into a question mark, in
FIG. 1 cently pu1)lisIietl 1)ooklet. Also in tlie series \vitIi a small 50 Q-1% resis-
booltlet are somc pictures of a typical tor and soldcrcd to a female ulif
T R I G G E R I N G L E V E L con-
maintenance facility and a Inap of tlie connector \\-ill do the trick. (Scc
trols full right.
United States slio\ving tlie location of fig. 2 ) . Tliis test jia has a \'S\\:li
S t e p 6. Tui-n the S T A B I L I T Y control
Telitronis Field Offices. T h o s e Field
to tlic left until the s\veep ceases
Offices liaving a Rcpair Center arc itlenti-
to operate. Continue to turn the
fied antl they, their atltlresses and tele-
control to the left for several
phone numbers are listed for ready ref-
more degrees.
erence.
S t e p 7. T u r n the TRIGGERIN(;
F o r your copy just call your T e k t r o n i s
L E V E L control to the left u n -
Field Engineer 2nd ask him for tlic
til a stable display is obtained. Field Ifaintenance Facilities and Serv-
O n instruments for \vl:ich this pro- ices I~ooltlet.
cctlure is intended, the operator can vie\\.
e i t h e r a field o r line presentation. Lirni-
tations of these i~istrurnents, I~oweves,
\\-ill not permit the operator to select thc QUESTIONS FROM THE FIELD OF:
TYPE 19OA
line to I)e presented. 1. Q. W h a t is the risetime of the P500C1: TYPE 105 on
E d i t o r s note: P a r t I 1 of this article Probe? TYPE 107
\\-ill appear in the n e s t ( i \ p r ~ l ) issue of A. W e used the following equipment:
S E R V I C E S C O P E . T h e procedure f o ~ a Type 545A Oscilloscope ~vitli Fig. 2
vie\ving composite video signals on tlie T y p e K Plug-In (l'assbantl of this
T y p e 535, 545, 535A, and 545A will l x combinatioil \\-as 30.5 m c ) , a T y p c of 1.05 at 20 mc and can b e used
given at that time. 108 Fast-Rise Mercury Pulser, antl with a T e k t r o n i s T y p c 19011 Con-
a PjOOCI; I'robc. Risetime figures stant Amplitude S ~ g n a l G e n e ~ a t o ~
obtained under these conditions for passband response, and a T y p e
HELP I N USING AND UNDERSTAND- were as folio\\-s: 105 o r T y p e 107 Square \\rave Gen-
ING YOUR TYPE 535A OR TYPE P5OOCF (\\-it11no attenuation) erator for square \vave response.
13.0 nsec. i. Q . W e have noticed a spurious pulse
545A OSCILLOSCOPE PjOOCF (with 1 0 S attenuator) on a T y p e 575 Transistor-Curve
T h e T y p c 535A and T y p c 545A Oscil. 17.5 nsec. Tracer. T h i s is a positive pulse
loscopes are cxtrcmelp versatile instru- 2. (2. D o you have any drift figures 011 which occurs bet\veen each normal
ments. T o fully utilize their capabilities tlie T y p e 503 Oscilloscope? cycle for P - X - P transistors). T h e
an operator must I)e completely familial -4. \Ve have never quoted any tlrift pulsc length is about 5 milliseconds
\\it11 each control and its function. Thc specifications for the T y p e 503. antl about 4 volts in amplitude
n e w operator, tlie partially informec Ho\vevcr, \ve ran some checlts oil \vIicn the base current is set f o r
operator, or even tlie experienced o p c r a t o ~ ten production T y p e 503's. After 1 milliampere per stcp. Could tliis
\\-ill find the 1)ooklet "Vsing Y o u r Oscil an initial \\arm-up period to allo\v pulse damage transistors having a
loscope T y p e 535.k or T y p e 545A" ; the instruments to stabilize, t h r lo\\? rcvcrse rating bet\veen base
g r e a t aid in acquiring tliis desired tlegrcc follo\ving drift figures were re- and emitter? If so, how can it be
of familiarity \\.it11 these instruments. corded at a sensitivity of 1 m\-/cm. eliminated ':
T h i s booklet is a r c ~ i s e t land up-tlatcc Rememl)er, these al-e only typical
version of one originally \vritteti for oper figures and a r c not t o I)e consider- A. T h e transistor is driven from a con-
a t o r s of tlie old Type 53.5 and Tj-pc 54: ed tlrift specifications for tlic T y p c stant-current source. If tlie Step
instruments*. I t is \\-sitten in tivo parts 503. Zero is set so that the first base
P a r t 1 , "Getting Acquainted", dcsci-ihe: Average drift 1.5 cm/hr. stcp occurs \vhen tlie transistor is
tlie effect of each front-panel control, ex hfinimum tlrift 0.5 cm/lir. cut off, the masiinuin voltage ca-
plains in detail the unique Telitronis fca Nasi~num drift 3.0 cm/hr. pabilities of the Base Step Gener-
t u r c s : Delayed TI-iggcr, Delayed S\vcel T h e input 6DJS's have the greatest ator \\-ill be present a t t h e base
a n d Single Sweep modes of operatior effect on drift. Also, the t\vc terminal of the transistor under
( t h a t give to these instrumcnts their higl 2N544 transistors tlcsignatetl (2454 test. Since the first step current is
tlegl-ce o i flcsil~le versatility), and out antl (2164 in the vertical amplifiei limited to the scale setting, there
lines somc of the more frcqucntly en affect tlie tlrift. is small chance of damage t o tlic
countered oscilloscope operations. 3. Q . In tlie T y p e 580 Series Oscillo- transistor niitlcr test. T h e Step
P a r t 2 of the I>oolilet includes the in scopes can a signal be connectec' Zero control can be set to elimin-
formation in tlic "Getting Acquainted directly to tlic vertical t1cilectio1- a t e tliis pulse i f desired.
section, in condensed form fol- easy refel- plates of tlie C R T ? 6. (2. Can a T y p e 502 Dual-Beam Oscil-
eiice, plus simple, easily-understood in !I. According to \'auglin \VeitIcl (Eli- loscope be modified t o provide
structions on other applications of th g i n w r i n g ) , ~ v eliave not tlevclopcc variable controls on tlie vertical
oscilloscopes. an acccptal~lemethod for insertin& amplifiers?
T o obtain a copy of this booklet, a s signals directly into the vertica A. Yes, a field modification Itit is
y o u r Telitronis Field Engineer for FIP- deflection plates of the ci-ts in thesc available to accomplish this. T h e kit

COPYRIGHT 1 9 6 1 . TEKTRONIX, INC.
adds a T7ARIABLE V O L T S / C I I
control to the iront panel for both
t h e U P P E R and LO\\-ER beam
vertical ;implifiers. I t includes a
T y p e 510
Series or
T y p e 550
Chicago, Illinois
I related problems and anxious t o help in
tll eir solution.
This is an economical program oficred
1 a no charge basis. Tlie only thing ~ v e
Series
complete set of components, parts Type CA, ; I i you to spend is your time!
list, schematic, photos, antl step- o r K , o r I, * I n the T y p e 535 and 545 tliis fea-
by-step iiistallation instructions. Plug-Ill ture is Imo\vn as tlie Delaying Slveep.
01-tler tlie kit from your Tektronix
Ficltl Ofiice. Speciiiy; T y p e 502 MORE LOST OR STOLEN SCOPES ORIGINAL PRODUCTION
V a r i a l ~ l c \'olts/cm I I o d . Kit, T e k OSCILLOSCOPE
Tel;troiiix Fieltl Engineer Ron Bell re-
p a r t number 010-222. 'She price
mrts tliat a T y p c 316S1, serial number
RETURNS TO TEKTRONIX
is $10.50. \ I /
)02, is missing irom the Goodyear Air-
:raft Corpo~-ationin Akron, Ohio. If you
USED INSTRUMENTS FOR SALE lave any iiiformation on tliis instrmilcnt
iotiiy the Goodycar .\ircrait Corporation.
1 T y p e 315 Eric Vauglian T e k t r o n i s Fieltl Engineer Duncan
s/n 198 Superior Elcctl-ic Co. l o a n e reports the t1isappex1-ancc o i a
2 T y p e 512 83 Laurel Street Type 310.4, serial numhcr 011213, from
s/n's 1817 Pr Bristol, Connecticut .!~e Electroiiic Specialty Company, 5121
2717 ;an Fernando Road, 1.0s Angelcs 39,
California. If you rill1 across tliis scope
1 T y p e 521 I3oco \Vu n your area, iiotiiy the Electronic Spec-
Livingstone, New Jersey d t y Conlpany 11y collect \\-ire, oi- phone,
Tel. W y 2-1790 Cliapnia~i 5-3771.
1 T y p e 511D \\ialt Jannsons Tile iollo\ving instl-i~metitsIiave disa1)-
s/n 2615 Isomet Corporation pcared irom the custody o i the Philco
Palisades Park, Corporatioil, Governtneiit antl Industrial
lie\\- Jersey Group, 1700 \\'issahickon Avenue, Pliil- I n July of 1917 Tektl-onis shipped it,
'Tcl. \\yindsor 1-3070 adelpliia, Pciina. irst production osc~lloscope-a T y p e 511,
1 T y p e 512 Gus IVinston 1 T y p e -51l.A Oscilloscope s/n 20379 erial number 101. D r . A. R. T u n t u r i ;
s/n 111 1 227 I i a r i n a W a y 1 T y p e CX Plug-In Preampliiier s/n l i r e c t o r of Navy Acoustic Research at
Pacifica. California 10031 lie University of Oregon 3lctlical School
1 T y p e 1, Plug-In Prea~nplificr S/II n Portland, Oregon, took delivery o n
5235 liis instrument for the purchaser, tllr
USED INSTRUMENTS WANTED 1 T y p e 107 Sclual-e-\Vavc Generatoi- J. S. Navy.
s/n 625 F o r 13% years this T y p e 511 aided in
1 'Type 31011 1I1lton D P o s t If you linolv the \vliereal~outso r havc )rovidina D r . T ~ i n t u r i with reliable in-
-
160 i\: \\- 30th T e l I ace an?; information on these instruments 'ormation in liis research work-elec-
F t Lautlcrtlale, Florida please contact the Philco Corporation :sonic mapping of tlie brain. Kno\vlecIgc
1 T y p e 517 G Co~inell Computer Ilivision, T e s t Equipment Con- :aincd in this research is ~ a l u a b l ein the
trol Section, \Villo\v Grove, Pennsylvania liagnosis antl treatment of neurological
212 \Vensley Lane
Oltliield 9-7700, Extension -537. liseascs and ior tlie possible importance
E a s t I s l ~ p L o n g Island,
,
Tlic Florida P o ~ v e r Corporation a1 ~i applying lio\v the brain \vorks to the
&?el\- York
Winter P a r k , Florida, reports tliat t h e i ~ le\-elopment of a ~neclianical brain for
1 T y p c 535 Purcell Robinson T y p c 310S2 Oscilloscope s/n 6673 is miss. guided n~issiles. I3uring this timc instal-
or Type 1412 Nortli 62nd Street ing antl may have hccn stolen. Pleasc ation o i several factory-tleveloped im-
545 Pli~ladelpliia Penna.
31, contact them ii you have any informatio~ Irovcment modifications aided this T y p e
1 T y p e 511 o r Weaver County School on tliis instrument. i l l to keep abreast of D r . Tunturi's oscil-
T y p e 524 D~strlct loscope requirements. T h e instriimcnt re-
L 0 . Keys DO YOU UNDERSTAND THE SWEEP mained, lie\\-evci-, essentially a T y p e 511
Salt Lalie C ~ t y U t a h
, \vliile D r . Tunturi's \\-orli continued to
DELAY FEATURE OF YOUR TEKTRONIX
Elgm 9-7691 advance. Eventually the need for a more
OSCILLOSCOPE ?
1 T y p e 535 01 Robert Slim sophisticated oscilloscope I~ecameundeni-
535A Ultronics T h e S\vecp Delay* is an importaii able.
1 T y p e CA 118 Nortli 3rd St. ieature of tlie T y p e 53512, 51512, 555 an( Rudy \ ' ~ ~ l i ~ io i l ithe Tclitronix .Ad-
~
1 Type C Camden, New Jersey 585 Oscilloscopes. Ho\vcvcr, some user' vertising Department could see reciprocal
\\'oodla\\ n 1-1661 of these instruments are completely una 1)enefits in D r . Tunturi's need for a more
\\-are of the flexibility this feature pro atlvancetl oscilloscope atid tlie Tektronix
1 T y p c 530 o r Professor George C. Ne\v vides o r the many applications made pos desire t o return their original 111-otluction
510 Series ton, J r . sible by it. instrument to its place o i origin.
\v\.ith a T y p e Electronic Systems I t is not within the scope o i this publi Xccortlingly, lie assisted in \\-orking out
53/54C o r Laboratory cation to explain tlie S ~ v c c pDelay ieatur a mutually 1)encficial agreement l ~ e t \ \ - e e ~ l
CA Plug-In IIassacliusetts Institute -space \\-ill not permit it-but \ve cal the interested parties. In exchange ior
of Technology tell you l i o ~ v you can have it explaines the T>-pe 511, serial ni11ii1,er 101, D r .
Cambridge 39, X a s s . and demonstrated to you. Call your T e k T u n t i ~ r i accepted for tlie U. S. R a v y a
1 T y p e 112 \Vestinghouse Electric t r o n i s Ficltl Engineer! Tclitronix T y p e 515 Oscilloscope, an in-
Prearnpli- COI-p. Tlie explanation and demonstration, i strnment admiral~ly suited to his present
fier Cletus Hostetler you desire, can be given beiore a grou oscilloscope rcquii-ements.
P . 0 . Box 281 o i your teclinicians and engineers a t T y p e 511, serial ~ i i i n ~ l x r101 no\\-
Elmira, Nen- Yorli convenient timc and place. stands proudly on display in the r e c e l ~ -
You \\-ill find your Tektronix Field E r tion area of the Telitronix factory in
1 T y p e 531 o r Richard Van Lunen gineer to be a competent instructor \vit 13ea\-erton, Oregon. Every Telitronis
T y p c 535 9203 Alcona Street a minimum o i six months factory trail cmployce cspresscs his tlianks t o the
12anham, I l a r y l a n d itig in tlie use and service o i Tclitroni U. S. S a q and D r . ~~~~~~~~i for theis
1 T y p e 530 I x o n a r d I I . DeBall instruments. Furthermore, lie is keen1 co-operation in returning this instrument
Series o r 5217 S . Avers Avenue and genuinely ~ntcrcstetl in your scar t o us. IVe a r e proud of our "iirst born"!
COMPUTER ENGINEERS SAY P6016 1.5 volts rms. I\ 5inij)le l~attei-y-po\vcretl
CURRENT PROBE A NECESSITY raiisistor amplifier xvitli fl-cqucncy inulti-
~lication \vill raise I)otli the signal level
Telitronis Field Engineer Owen H a r r i - FINDING BURIED CABLES rnd the frequency for licatlphones.
s o n reports many of the conlputer en-
gineers lie calls on consider the T e k t r o n i s 1 Telitronis T y p e 321 battery-po\\~erctl
P6016 Current Probe a necessity in corn- )ortable oscilloscope m a y be used t o
p u t c r ser\.icc \\-ork. T h e y claim that con- d i e a visual measurement. I t will do
sitlera1)lc savings in computer service time his job without an esternal preamplifier.
Jsing the 321 \\-it11 the pickup loop and a
can 11c rcalizetl I)y the use of this probe.
Compared to tlie neth hod \vlicre a one I1 pf capacitor, you m a y locate each
o h m resistor must I)e inserted into the ;round radial of a broadcast antenna
circuitry to ol~tain readings, the use of a vhilc tlie station is on the air. I n this
:ase the signal will be the station's car-
P6016 Current P r o l ~ e can cut computer
service time I)y a s n111ch a s 50%. ies.
irou search I\-ith the pickup loop flat on
Sf you are not acquainted with the T e k - he ground. W h e n tlie loop is on both
t r o n i s P6016 Current Probe, call your ,ides of the buried conductor, it \\-ill
T c k t r o n i s Field Office. h Field Secre- ~ i c l i p energy from the conductor.
u
t a r y or a Field Engineer \vill he happy 4 s the loop passes directly over the con-
t o arrange a demonstration a t your con- You may easily tletcrminc the position of luctor, the signal disappears. W h e n it
venience. I n addition to I ~ c i n g iniorma- a single conductor, buried eight t o 10 feet
noves past the conductor, the signal re-
tive, tlic demonstration m a y aid in solv- b e l o ~ v the ground surface, by magnetic
ippears.
ing ( o r making it easier to solve) sonic ot detection.
For cables deeper than 10 feet, increase
yo11r engineering or servicing p r o b l e ~ n s . A 10 to 15-ampere 60-cycle current pass-
111 dimensions of the coil to maintain the
ed through a buried conductor will creatc same accuracy.
a strong niagnetic field that a si171pIe
picliup loop and detector can locate
TEKTRONIX TOUCH-UP PAlNT easily. CORRECTION
Touch-up paint to match the colors anti If t\vo \\.ires of 117 v a c circuit must 11c W e milst call your attention to three
finishes of T c k t r o n i s instrunients is n o n located, one of them must be discon- errors, one typographical and two o f
available. T h e paints for touch-up jobs on nected and an alternate c s t c r ~ i a llead s u b omission, in the article "Timing t h e T y p e
gray-n-rinlilc, I~luc-wrinlile, o r blue-viny: stit~itcd. ( A good gl-ound \\.ill do.) If .530A/510A Series Oscilloscopes". T h i s
finished calinets come in 2 ounce jars hot11 \\.ires are used, the magnetic flus articlc appea~-ctl in the l3eceml)er 1960
Also, tlic blue-~vrinkle and blue-viny' f r o m one \vill cancel the magnetic flus of Service Scope.
paints thinned for spraying, a r e availablt the otl1cr. Tn Step 6 of this article the .5 psec/cni
in 1 quart cans. An effective pickup loop consists of foul- setting of the T S M E / C l f s\\-itch should
to 10 turns of \\-ire formed into a n oval reatl .1 psec/cm.
O r d e r througli your T e k t r o n i s Ficlc Jnstructions for adjustment of C375
almilt five feet long and a foot \vide. B y -
Engineer o r Field Office from the folio\\- pass the t\\-o leads from tlie loop \\-ith a sliould Iiave follo\ved the instructions
ing chart. for adjusting C361. H e r e they a r e :
.0l pi capacitor to reduce any I-adio fre-
TEK N O . DESCRIPTION Q T Y . PRlCI .-\tljust C375 for 1)cst linearity I~et\\;een
quency energy from 1)roatlcast stations.
252-083 Gray Wrinkle Touch-up 2-02 $1.1 the 2nd and the 6th vertical graticule
252-084 Blue Wrinkle Touch-up 2-02 1.1 (If cal)lc near a I~roatlcast antenna is to lines.
252-085 Blue Wrinkle ThinnedC I - q t 3.0 he located, yo11 may need an additional Finally, if it is necessary t o replace tlic
252-086 Blue Vinyl Touch-up 2-02 1.1 lo\\--pass filter to Iiccp r-f from reaching ti\-o 6DJS o ~ i t p u tt u l ~ e s ,the I\-hole timing
252-087 Blue Vinyl Thinnedi' 1-qt 2.8 the tlctector.)
"These thinned paints ore intended for spray-gu
-.l he detector neetls cnoug11 sensitivity to
procedure slioultl be run t l ~ r o u g hagain.
No\\-, i f you don't mind, \ve \vill go
application intlicatr signals at a maximum of ahout apply a soothing lotion t o a very red face.

Tektronix Instrument-Repair Facilities: T h e r e is a fully-equipped a n d properly-staffed Tektronix I n -
A-2057 strument Repair Station near you. Ask your Field Engineer about T e k t r o n i x Instrument-Repair facilities.
USEFUL INFORMATION FOR USERS OF TEKTRONIX INSTRUMENTS

NUMBER 7 P R I N T E D IN U.S.A APRIL 1961

TYPE 5301540 OR TYPE 530Al540A time base .FP o r L A Y E D ) * position. Sct tlic
SERIES (delaying r,u8sp)* TIME BASE A (AIAIN
trigger input
OSCILLOSCOPES AND COMPOSITE S W E E P ) % T I I f E / C I I sn-~tch to
tlisplay any desirctl num1)cr o f
VIDEO SIGNALS lines. Trigger the 'A' DE12'D
Part 2 13Y 'R' ( 3 I A I N S W E E P D E -
Fig. 1, which appeared with P a r t 1 of I , A Y E D ) * from tlie first line
this article in tlie February issue of sync pulse after tlie delayed trig-
S E R V I C E S C O P E , was incorrectly ger b y turning tlie TISLE B A S E
tlrawn. T h e circuit as shown was not A (hfAIN S W E E P ) * STABIl>-
a n integrator circuit. Notice that in TTY and TRIGGERING
the corrected (11-a~ving (fig. 1 belo\v) the 1,EVEI- controls full riglit ant1
10 k resistor prccetlcs tlie 0.01 piti capac- then turning the S T A B I L I T Y
itor in the circuit from tlie VERT. S I G . vert sig out J
c o ~ i t r o lto tlie left until the sweep
O U T t o the T R I G G E R I N P U T . ceases to operate. Continue turn-
ing the S T A R I I , I T Y control to
TRIGGER INPUT-
( N o t e : If available, Field sync tlic left for scvcral more tle-
pulses are prcfera1)le for triggel-- grces.
ing tlic Delaying Sweep.) I f you are displaying video sig-
nals of positive-going polarity.
s\vitcli tlie T I h l E B A S E A
Stcp 3. Set tlie H O R I Z O N T A L D I S - (MAIN S W E E P ) * TRIGGER
P L A Y switch to the 'B' I N - S I a O P E control to + I N T : if
T E N S I F I E D R Y 'A' ( D E L A Y - you liave negative-going signals.
I N G S W E E P ) * ' position. Turn s\\;itcli T I N E R A S E A ( M A I N
the T I M E B A S E I3 ( D E L A Y - S\VEEP)* TRIGGER SI,OPE
ING S W E E P ) " STARILITY control to -1NT. T u r n tlie
antl T R I G G E R I N G L E V E I . TIME BASE A (MAIN
controls full right. Set the SWEEP)" TRIGGERING
T I 3 1 E R A S E 13 ( D E L A Y I N ( ; I,EVEI, control to the left until
S W E E P ) " T I h f E / C h I s\vitch to a sta1)le tlisplay is o1)tained.
5 hLI1.I.ISEC and the L E N G T H T h e display will no\v he sin~ilar
control for 9 to 10 centimeters to the tlisplay obtained \vlien us-
Instructions in P a r t 1 of this article of slvecp. F o r displaying posi-
dealt with the T y p e 531, 532, 533, 541, ing the 'Typc 524 Oscilloscope;
tive-going video signals, turn tlic the line presentation \vill jump
543, 531A and 541A instruments. P a r t 2 'I'IlIE RASE 1 (DELAYIWG
3
will deal \\.it11 tlie 'Vype 535, 535A, 545 from one line to tlie nest as the
SWEEP)* TRIGGER SLOPE D E L A Y T I M E 1fUI,TIPI,IER
and 545.4 oscilloscopes. switch to + E X T (+)*antl the
Tlicse more sopl~isticatetl oscilloscope!: is turned tl~rougliits I-ange.
T I M E I3ASE 1 TRIGGEIIIXC;
3
provide the Telitronix unique Delaying J I O D E s\vitcli to AC (Type 535
Sweep feature and can also tlisplay eitlie~ and T y p e 545 instruments do not 13y s\vitcl~ing the H O R I Z O N -
field o r line presentations. In addition. have a triggering mode s\vitcli T A L D I S P I A Y control from
the Delaying Siveep feature permits t11c on tlie D E L A Y I N G S \ \ . E E P 'A' D E L ' D 13Y 'B' ( M A I N
operator to select tlie line presented section of their front panel), foi- S W E E P D E L A Y E D ) * positio~i
Also, once the instrument is set up, tlic ncgati\,c-going signals, stvitc11 the to the 'B' I N T E N S I F I E D B Y
operator can switch from line to fieltl T R I G G E R S L O P E to - E X T 'A' ( D E L A Y I N G S W E E P ) *
presentation I)y simply turning tlic (-)*. T u r n the T I J I E B A S E I3 position, you can have either line
H O I I I Z O N T A I , D I S P L A Y s\vitch. (DELAYING SWEEP)" o r field presentation. T h e T I M E
Here's ho\v you set it u p : S T A R I I - I T Y control to tlie left BASE A (MAIN SWEEP)"
until the ST\-ecpceases to operatc. briglltening on the T I M E B A S E
Step 1. U s e a wide-band Plug-In Pre- Continue turning tlie control B ( D E L A Y I N G S W E E P ) * will
a m p l i f ~ e rin the oscilloscope antl several more degrees to the left. indicate the horizontal lines being
apply the composite video signal Now turn the T I M E B A S E I3 observed \vith reference to the
to tlie I N P U T . Adjust thc (DELAYING SWEEP)* entire frame. + G A T E A (+
V O L T S / C 1 i to give 3 o r 3 T R I G G E R I N G L E V E L control G A T E M A I N S W E E P ) " could
ccnti~nctersof tleflect~on. to tlie left until a s t a l ~ l edisplay be used to ~ n o d u l a t ethe 'Z' axis
is ol~tainetl. This slioultl occur of a monitor kinescope.
Stcp 2. Couple the V E R T S I G OU'I \vhen the index mark is at or
to the T I M E B A S E 1 ( D E -
3 n r a r tfie straight up position. Stcp 6. If dual trace operation with a
L A Y I N G SLVEEP) T R I G G E R T y p e 53/54C, 53C, o r CA Plug-
I N \vith an Integrator clrcurl Stcp 4. Set tlie H O R I Z O N ' S A I ~ D I S - I N is desired, the trigger must
consisting of a 10 lc resistor ano P I , A Y sivitcli to the 'A' DEL'13 be derived from a n external
a 0.01 pfd capacitor. See f ~ g .i l3Y 'R' ( I I A I N S \ V E E P I I E - source rather then the V E R T
S I G O U T , due to the switching (1) T h e first problem is easily solved 31 640 W 7 Amp
signals present. T I M E B A S E for the on-ner of a Type 310(A), 316, 317, 95 725 W 8 Amp
A (DELAYING SWEEP)* 502 or 516 Oscilloscope. These instru- Power-hne regulation not r e q u ~ r e d ~f batter~es
sweep rates and length should be ments are equipped \\-it11 multi-tap power re In place and l ~ n e voltage does not exceed
adjusted to give proper presenta- transformers, for use at various "high" 25 v
tion of interlaced pairs of lines. or "low" line-voltage ranges. F o r other
igure B. Chart of Tektronix oscilloscope power
T h e above method will give usable re- instruments, it is necessary to provide
equirements.
s u l t s , but for specific applications most some external step-up or step-down trans-
engineers will prefer a Type 524AD former to provide the necessary operating
Oscilloscope with its carefully designed voltage to the scope. A variable auto- (2) T h e second problem is a little more
sync-separator circuits. transformer of the "Variac" or "Power- lifficult. Althougl~slow periodic fluctua-
* (Captions in parenthesis apply to the stat" type is particularly useful in ac- ions in po~ver-line voltage can be con-
T y p e 535 and Type 545 instruments.) comodating a \vide range of input volt- .enientlp handletl with a variable auto-
ages. An inexpensive filament transfor- ransformer, as above, there are many
mer may also be used as an autotrans- m a s where wide line-voltage variations
SERVICE HINTS ire so frequent that a constant-voltage-
former in cases where the line voltage
Tektronix Field Maintenance Engineer is consistently high or low. Reconnected ransformer type of regulator appears to
J a c k Banister finds a pressure can of con- as sho\vn in Figure a , the transformer's )e the only solution. However, for proper
t a c t cleaner a handy service tool. T h e use )peration of the oscilloscope power sup-
of t h i s cleaner has usually been with tube )lies, it is extremely important that the
sockets in jittery vertical amplifiers. H e .egulator does not cause waveform dis-
s q u i r t s the cleaner into the vertical-ampli- ortion. The electronically-regulated
fier tube sockets. Several times this oper- lower supplies in Tektronix oscilloscopes
ation has cleared up the trouble just fine. -equire not so much a certain rms voltage
Indications of faulty pin contacts can In which to operate, as a certain mini-
generally be made apparent by wiggling I C 1 nun1 peak-to-peak voltage. Many regula-
a t u b e in its socket. ing transformers of the saturable-react-
Figure A. Low-cost line-voltage boost or drop cir-
T h e brand name of the contact cleaner mce type regulate primarily by limiting
cuit, using o filoment transformer. Connect as
J a c k uses is "Injectoral". There are prob- he peaks of the incoming sine waves.
shown for 6 v boost; reverse secondary connections
a b l y other good contact cleaners in pres- Either a n rms or average-reading A C
for 6 v drop. Filament winding must hove minimum
s u r e cans on the market, but this is the
rating indicated in Figure B. roltmeter (most voltmeters are of the
o n l y one Jack has had experience with. atter type) may indlcate the proper rms
~ o l t a g e for scope operation. However,
O c c a s i o ~ ~ a l l y wlien a Type 530/540
, :he actual peak-to-peak voltage supplied
wcondary voltage is added to or sub- 3y most of the common "constant-
Series Chopping-Transient-Blanking Mod tracted from the inconling line voltage
K i t (Tek. No. 040-200) is installed in an voltage" transformers is insufficient for
to bring it within range. Be sure the fila- proper operation of the scope's power
instrument, the unblanking-spike phasing ment-winding current rating is adequate
occurs too early and does not cover the supplies. Under these circumstances ex-
switchiug transient. to carry the oscilloscope load (Fig. 13). xssive ripple, jitter, and instability will
Increasing the blanking period should Max. result. Therefore, it is important t o use
Recommended
correct this condition. T o do this, change Scope Power
snly a low-distortion type of regulator -
Transformer
t h e resistor on the grid (pin 5) of V78 Type Consumption
sne having less than, say 5% distortion
Rating (Min)
f r o m 270 k to 390 k. 31W! 175 W
at the highest expected incoming line
2 Amp
T h e 390 k resistor will generally in- 31 5 375 W
voltage under full oscilloscope load con-
4 Amp
crease the blanking period enough to 316 260 W
ditions. Regulators of this type are
3 Amp available through commercial channels,
cover the s\vitching transient and enable 317 260 W 3 Amp
t h e modification to work correctly. 321 though a t some increase in cost over the
20 W 1/4 Amp*
However, isolated cases may require a 502
models without waveform correction.
280 W 3 Amp
resistor of an even higher value. Tek- 503
T h e third problem - serious waveform
107 W 1 Amp
t r o n i s Maintenance Engineer Udo Lin- 504
distortion, giving the effect of low line
93 W 1 Amp
denmeyer found one instrument that 507
voltage -will be discussed in P a r t 2
600 W 8 Amp
required a 560 k resistor to give correct 51 1(A)
of this article which will appear in the
240 W 3 Amp
results. 51 2
June issue of S E R V I C E S C O P E . T h e
280 W 3 Amp discussion will include methods of deter-
51 3 475 W 6 Amp mining whether waveform distortion will
514(A) 375 W 4 Amp seriously affect the performance of your
SOLVING POWER LINE PROBLEMS 515(A) 300 W 3 Amp instrument and suggested solutions for
FOR BETTER SCOPE PERFORMANCE 516 300 W 3 Amp the problem.
517[A) 1250 W 15 Amp
Problems arising from excessively high
51 9 660 W 7 Amp
o r low line voltage continue to plague
users of Tektronix oscilloscopes in some 524(A) 500 W 5 Amp
areas. Tektronix oscilloscopes' are tle- 525 380 W 4 Amp USED INSTRUMENTS WANTED
signed to accommodate line-voltage vari- 526 340 W 4 Amp 1 Type 515 Gene Pulaski
ations up to roughly *lo% from design 527 240 W 3 Amp 200 Maple Ave.
center without loss of stability or ac- 531 (A) 455 W 5 Amp Graterford, Penn.
curacy; however, variation beyond these 532 475 W 5 Amp
limits (105-125 volt