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USEFUL INFORMATION FOR USERS OF TEKTRONIX INSTRUMENTS
JANUARY 1960
COFYRIEHT TEKTRONIX. INC. 1960 PRINTED I N U. 9. A.
FIELD CONVERSION OF SOME +((Captions in parenthesis apply to Types When adjusting C706 and C735 Trim-
535A and 545A instruments) mer capacitors in the 575's collector sweep
TEKTRONIX OSCILLOSCOPES circuit, be sure that the transistor adap-
to Use Type 6DJ8 Tubes ter is in place. Tektronix Field Engineer
THIS'N THAT
All type 6BQ7A electron tubes in Tek- Lee Cooper reports that the small amount
tronix T y p e 531, 535, 541, 545, RM31, Type 310 has a typical problem: of capacity introduced by the adapter re-
RM35, RM41, and RM45 may be replaced When the high voltage power supply sults in a different setting of the trim-
with their more reliable counterpart, the goes out of regulation, the vertical and mers.
type 6DJ8, provided certain precautions horizontal gain o r sensitivity is decreased. In early "R" units, some of the power
are observed. These tubes have been This has usually been caused by an opeu transistors had what appeared to be un-
substituted without making any circuit connection on the printed circuit board ~vorkmanlikesolder connections. T h e first
changes. Minor recalibration checks are and almost alxvays seems to be in the power transistors used in the "R" unit
required in some instances. In most heater connection to V701A, a 12AT7 did not have tinned leads so were very
cases better perforn~ance may be obtained, tube. Usually it turns out to be a separa- difficult to solder. Later transistors have
as \veil a s much better reliability. tion of the solder fron-. the copper strip tinned leads, and a good solder job is
I
on the printed circuit board at the tube being done.
socket. Visual inspection, of course, QUESTIONS FROM THE FIELD
shows that V701A does not light up. 1. Q . When using the very fast Polaroid?
Reports from Tektronix Field Eugi- Land film, why do some exposures
neers Geoff Gass and Marvin Crouch, give a bright haze on the picture?
iudicate fast oscillograms are being taken A. W h e n the C R T phosphors are ex-
with Agfa Isopan Record Film developed posed to ambient room light, the
for 25 minutes in D76 at 68' F. Ken absorbed energy in the phosphor
Davis in Portland informs us that de- must be given sufficient time to
veloping 26 minutes in D l 9 at 68" F., also decay. T h e new Polaroid ? Land
gives excellent results. Measurements No. 47 film, faster than Tri-X,
made by Ken indicate that at these de- can give a bright haze on the pic-
velopments, Agfa Isopan Record has a ture from the energy retained in
"Raw-stock" tubes are used as replace- writing rate about equal to that of Tri-X. the phosphor.
ments. T h e type 6DJ8 tube appears to Compeusated Probes are no longer be- 2. Q . Can the Type 110 produce both
have inherently good short-and-long-term ing adjusted to the particular instrument positive and negative pulses?
stability. Also, the operating character- with which they are shipped. Experience A. Yes. T h e operator can choose
istics are very consistent between both indicates that past practice of matching plus pulses or minus pulses from
sections and from tube to tube. I t is probes and instruments at time of ship- a plus or minus internal charging
anticipated that the need of aged and ment is not necessary o r desirable. T h e supply. (See tentative spec. sheet,
checked tubes in the several positions probe compensation should always be ad- "Pulse Polarity" knob selects plus
that now use aged and checked 6BQ7A's justed by the operator at the time he uses or minus pulses.) Pulse widths
will be eliminated with the change to a probe with an instrument. A properly I may be identical or alternately dif-
6DJ8's. compensated probe
A n instruction sheet with a tube re- is a necessity when AIRFLOW WITH SCOPEMOBILE FAN KIT
placemeut table covering this field con- accurate readings or
version is available. Address your re-
measuremeuts are
quest for these sheets to Field Communi-
cations Department, Tektronix, Inc., P. desired.
0. B o x 831, Portland 7, Oregon. Ask for Quite a few 531
FAIR-115. manuals were ship-
EXCUSE US PLEASE ped into the field
T h e article appearing in the October showing pin 6 of
issue of "Service Scope" under the title 1720 tied to 225 volts
"Use of Types 535, 535A, 545, and 515A through R32. This
for Double Sweeps" contained a typo- was a typographical
graphical error. T h e last part of step 6 error in the 531 Man-
should read: ". . . . and set the Slope uals. R32 should go
(Time Base B Trigger Slope)* switch to 350 This Several customers have requested information on the volume
the + ( + E x t . ) * position." With this cor- \Iras reported of air provided by the Scopemobile Fan Kit modification when
rection the procedure should work. I t in the number it is installed in the Type 500A Scopemobile.
did for us. range about 9000' \\'it11 the Scopemobile d r a ~ v e rin place the airflo\v is 83 c.f.m.
With the drarver removed and a panel covering the drawer open-
? Polaroid is a registered trademark of t h e Polaroid Corl~oration, ing the airflo\v is increased to 94 c.f.m. These figures are with
liue voltage at normal.
.-.
Tektronix Instrument-Repair Facilities: There is a fully-equipped and properly-staffed Tektronix l n -
strument Repair Station near you. Ask your Field Engineer about Tektronix Instrument-Repair facilities.
A- 1093
ferent. O n "external", the pulses month or two coming, however. V23. Designate this neon bulb
m a y not only have alternately dif- 7. Q . W h a t are tlie limiting factors in 1377.
ferent widths, but also different the vertical amplifier of a 545 \rith ( ) 5. Locate V24 and repeat the pro-
polarities if desired. a C unit when you overdrive the cedure with the second neon bulb,
3. Q. W h a t is the vertical response of amplifier \\.it11 a pulse, antl try to placing the neon bulb tip in the
t h e 581 a t the 3, 6, 9 antl 12 db look a t the top one-volt portion of corresponding eyelet of C28 antl
points with a sinusoidal input? the pulse which is in the order of soldering the leads to pin 7
A . Approximately: 3db down a t 100 260 volts in amplitude? I realize antl 8 of V24. Designate this neon
a differential metliotl of making bull^ 1178.
n1c
this measurement can probably be
6 db down a t 140 ( ) 6. Add the parts list to your instruc-
accon~plislied,but I am looking for
mc tion manual and add the neon
limitations in the vertical amplifier.
9 d b down a t 180 bull^ symbols to your schematics
O n e of the reasons this question
mc diagram.
arises is the fact that you can posi-
12 d b down a t
tion the top part of this pulse to
.::>v - 7, L 10
200-250 mc
tlie center of the C R T .
4 -: - 7
i S
T h e s e values are approximate. ; .3
r ..
-7- .,
%
: -,-
:7
i '
T h e roll-off is not very smooth be- A. O n e of the Staff Engineers ran a
low the 9-12 db points, and any test on this, and found a signal
small termination bump in the that filled the graticule twice, 8 cm , ---
2
vertical will give peaks and dips in in amplitude, caused some tlistor-
responses above 200 mc. and in
some cases down as low as 100 mc.
tion. H e used a square wave from
a T y p e 105. t77 $
.\
,,,
..7c
-L. a 10 ,2:.
4. Q. W h a t tubes manufactured outside CATHODE-FOLLOWER PROTECTION
*THE LEGEND IN THE INSTRUCTION MANUAL
t h e U.S. do we use in our instru- FOR TYPE 524AD OSCILLOSCOPE S I N DIAGRAM FOR THE 524AD VERTICAL AMPLI-
ments? 5001 -5899 FIER 15 INCORRECT. IT SHOWS THIS TUBE
A 5 VZ4A I N S T E A D O F VZ48.
A . 12AT7, 12AX7-Telefunken.
\\:lien the instrument is first turned
GZ34/5AR1, ECC88/6D J8, 6360,
6939, E180F/6688-Amperes
on an excessive voltage exists between USED INSTRUMENTS WANTED
the grid and cathode of the catliode-fol-
12AU7-Telefunken and Amperes 1 T y p e 532/B George Peterson
lower sections of V23 and 21. A modifi-
5. Q . W h a t shift in trace is permissible cation is recommended for all T y p e 524- T h e Aircraft Instru-
when changing the CA from a AD instruments, S / N 5001-5899. ment Co.
condition of having two traces, T w o N E 2 neon bulbs are installed King of Prussia Rd.
both centered, to tlie Added Al- I\-liich will ignite for several seconds when Ratlnor. P a .
gebraically position? the instrument is first turned on. T h i s 1 T y p e 512 o r Allen \V. K u r t z
A. Not more than 3-cm shift is allox- \\-ill hold tlie grid-to-cathode voltage to 514 International Elec-
able. This can be adjusted by a reasonably safe value until the instru- tronics hIfg. Co.
changing the vertical position and ment is warmed u p and in operation. 515 East Grand Ave.
range (R4376). These neon bulbs a r e available from your Springfield, Ohio
local electronic supply sources. 1 T y p e 514 o r Patrick Close
6. Q . Can the attenuators for the P80
Procedure: 515 Westgate Laboratories
probe be stacked to provide less
sensitivity than 5 volts/cm? Are ( ) 1. Remove the right and left side Box 63
there any larger attenuators in panels. Yellow Springs, Ohio
sight? ( ) 2. Locate V23 (6BQ7) near the cen- 1 T y p e 531 o r Rex V. Johnson
A. A t present, the attenuators for ter of the V A chassis. 535 with B 39 Newell Avenue.
t h e P8O probe cannot be stacked. ( ) 3. Locate ceramic turret near V23 o r C Plug- Haddonfield, N e w
W e are \\-orking on a 10 x attenu- on \\-Ilk11 is mounted C31. T h i s I n Unit Jersey
a t o r which has resistive and capacitor is a variable compression 1 T y p e 531 o r 0 . Kienow
capacitive characteristics similar to type which has large eyelets on 535 o r 541 5813 E . 19th Street
t h e P80 probe. W i t h this atten- both terminals. o r 545 Tucson, Arizona
uator, it will he possible to use any ( ) 4. Place the glass tip of one of the O n e of the engineers of Maico Co.
of the present attenuators, increas- new neon bulbs in the lower hole woultl like a 3" scope for his basement
i n g their attenuation ratios b y a of C31 so that the leads m a y lab. T e k , Rlinneapolis will act a s go-
factor of 10. I t will be another be soldered t o pins 7 and 8 of between.
USEFUL INFORMATION FOR USERS OF TEKTRONIX INSTRUMENTS
AUGUST 1960
CDPYRIGHT 1959 T E K T R O N I X , INC. P R I N T E D I N U. 8. A.
DOES THE SQUARE WAVE RESPONSE :athode sleeve, and a low cathode cur- is the article "Wavemeter, Oscil-
OF YOUR SCOPE LOOK LlKE THIS? -ent flow will hasten the formation of the x c o p e Measure Magnetic Field By
mpurities l a y e r . . . .in many tubes the 'aramagnetic Resonance". This informa-
ime required is less than 500 hours. ive article, which appeared in the Decem-
However, a sizable current flow through ~ e r 1959 issue of E L E C T R I C A L D E -
.he tube tends to minimize the effective ; I G N N E W S , claims an accuracy o f
'ormation of an interface layer by pene- '-0.06 percent in measuring the gap flux
trating the accumulated impurities with lensity of a magnet by the method de-
random low resistance current paths cribed in the article. A further advan-
(holes) between nickel sleeve and barium age claimed for this new technique over
oxide coating. onventional methods is the speed with
Evidently, interface will manifest itself vhich these measurements can be made.
in any instrument employing vacuum
tubes to either display o r generate fast-
rise square waves. W e can assume that TYPE 502 TRIGGER AMPLIFIER
Fig. 1 TUBE PROTECTION
since a tube in operation can form an
interface layer in less than 500 hours,
OR LlKE THIS? instruments in operation 8 hours a day H e r e is a simple modification to pro-
should be checked for evidence of this tect the T y p e 502 trigger amplifier tube
defect every 30 to 60 days, o r a t least (V24) from high amplitude signals when
every 500 hours of operation. used with external trigger input.
T o check the vertical amplifier of a n Locate R10, a 1-meg, %-watt, 1070
oscilloscope for indications of cathode in- resistor. This resistor runs from ground
terface, feed in a fast-rising square wave to a point on the T R I G G E R S E L E C -
o f about 500 kc. Set the sweep rate to T O R switch. From this point a wire strap
display several cycles. If an overshoot connects to the P L U S - M I N U S s\vitch.
o f about 1/2 microsecond time constant is Replace this strap with a 470-k, %-\I,,
apparent, some of the vertical amplifier 1070 resistor shunted by a ,001-qf, 500-v
tubes have probably developed cathode discap.
interface. For absolute proof, plug the T y p e 502's with serial numbers above
Fig. 2 oscilloscope into an ac power source with 623 do not require this change.
a variable control. An increase in the
output voltage of the power source will SUGGESTED READING
Unless the squarewave response of your increase heater voltage and reduce over-
scope resembles the waveform shown in shoot caused by cathode interface. A
Fig. 2 . . . .better keep reading! For an excellent discussion on the con-
decrease in the output voltage of the nection between band\vidth and frequency
A condition known as cathode interface power source will decrease heater voltage
can gradually develop in the vertical arn- response, composition of rise-time and
and increase overshoot due to cathode in- other details associated \\it11 square wave
plifier tubes of any oscilloscope, causing terface.
d e g e n e r a t ~ o nof medlum antl low frequen- testing, see Vol. 18, Radiation Labora-
T h e only cure for the problem caused tory Series, " V a c u u n ~ Tube Amplifiers"
cies. . . .leaving an overshoot o n the lead- by cathode interface is replacement of the
ing edge of fast-rise (2 psec o r less) ( McGra~r-Hill)
offending tubes.
squarewaves (see Fig. 1). T h e entire instrument should be check-
L o w frequency degeneration is caused ed and recalibrated at least every six
by the serles resistance (50 o h m s o r HOT SCOPE!
months. Only through periodic main-
more) of an interface layer of cheniical tenance, can the full usefulness, accuracy, 'Sektronix Field Engineer H a l Dosch
impurities that forms between cathode and dependability built into Tektronix reports lie has received \vord from Naval
sleeve and the barium oxide cathode oscilloscopes be realized. Intelligence that a Tektronix T y p e 515A
coating. Oscilloscope, S / N 3645 is missing from
Leading edge overshoot is caused from Earl Anderson
Customer Service Staff the U.S. Navy Electronics Laboratory at
the by-passing effect of the capacitance San Diego antl has apparently been
(.005fif or greater) between oxide coating Tektronix, Inc.
stolen.
and cathode sleeve. If you shoultl see this instrument,
N O T E : In a true sense, this is not a MEASURING MAGNETIC FIELDS
.P know of its whereabouts, o r have any in-
pure capacitance, as the electronic action information regarding it, contact the
within the interface la'yer (serving as the nearest office of the Naval Intelligence
dielectric) is highly complex. Department immediately.
T h e rate at which an interface layer
forms within a tube is a function of cath-
ode temperature, number of hours the TYPE 536 AMPLIFIER MODIFICATION
tube is used, average cathode current, and
the amount of impurities originally pres- A modification kit, to convert the type
ent in the cathode sleeve material. For 5894 tubes in the T y p e 536 vertical and
example, high cathode temperature, long horizontal circuits to type 6340's is avail-
hours o f operation, a high percentage oi Suggested reading for those people in- able. This conversion, which provides
impurities in the nickel used to m a k e tht terested in the measuring of magnetic improved reliability and simplifies tube
replacement, is applicable to instruments Ask your Tektronix Field Engineer for: 1 Type 515 Norm Haugen
with serial numbers below 615. Instru- or 535/CA Communitronics
ments with serial numbers above 614 Tek No. Description Price 2012 Longwood Road
have been factory converted to use the 355-043 Replacement graticule N/C West Palm Beach, Fla.
type 6340 tubes. T h e kit contains: two stud Phone: T E . 3-8320
wired tube socket mounting-plate assem- 212-507 Screw, 10-32x3/SUBHS N/C
blies, one step-by-step check-off instruc- 210-010 Lockwasher N/C 1 Type 530 John Sutherland
tion booklet with photos, schematic and Series or 2706 21st Avenue S.
parts list, all other components and hard- preferably Seattle. Wash.
ware required in the conversion. W e do not recommend the operation of 540 Series
a Tektronix Plug-In Oscilloscope with
A s k your Tektronix Field Engineer for the side panels removed. T h e fan will not
T y p e 536 VA-HA Tube Conversion Mod- 1 Type 524 James Scharman
distribute air properly to the plug-in pre- Alvarado T V Co., Inc.
ification Kit No. 040-192. amplifier area when the side panels are Albuquerque, New Mexico
not in place. Continued operation of the
OSCILLOSCOPE PHOTOGRAPHY instrument under these conditions will de- H. L. Ziegler
1 Type 514
crease tube reliability. 275 Middle Street
East Weymouth, Mass.
Sometimes 01'1 the older Type 524 in-
struments it is difficult to time the .1 1 Type 511 J i m Williams
psec/cm sweep range. Tektronix Field or 514 4424 Juniper Avenue
Engineer Hal Dosch offers this sugges- Wichita 16, Kansas
tion to correct the difficulty: Be sure the
horizontal sweep amplifier is properly 1 Type 514 E. J. Crossen
con~pensated. Then, if adjusting the vari- 81 Cherry Lane
able capacitor C231A will not bring the Levittown, Penn.
.1 psec/cm sweep into range, try reducing
or shorting out R274. This 1.5-k, j/2-w, 1 Type 514 Herbert L. Rosenblatt
10% resistor is in series with C231A. or 531 Dept. 694, Burroughs
Corp.
Great Valley Labs.
A bulletin inten USED INSTRUMENTS WANTED Paoli Penn.
to the photography of traces on the
1 Type 524 Larry Hine
cathode-ray tube of Tektronix 5-inch 1 Type 514 H . Stuart Dodge
120 Elmwood Place
oscilloscopes is available. This is a re- or 531 Reliability Dept.
Shearill, N. Y.
vised and up-dated edition of a former Burroughs Corp.
bulletin many oscilloscope users found Great Valley Labs.
helpful. Suggestions are offered and some 1 Type 310 J. M. Gottschalk
or 310A 108 Charles Drive B-2 Paoli. Penn.
of the topics discussed are: Polaroid-
Land* films, exposure guides and how to Bryn hlawr, Penn.
photograph different types of traces. USED INSTRUMENTS FOR SALE
A s k your Tektronix Field Engineer for 1 Type 541 D. A. Nina 2 Type C. W . Penque
FIP-3, "Notes on T h e Practical Photog- or 541A and Elion Instruments 511AD Sperry Products Co.
raphy of Oscilloscope Displays." CA Plug-in 701 Canal Street S/N 3690 Danbury, Conn.
Unit Hristol. Pa. and 3692
*Polaroid is a registered trademark of
the Polaroid Corporation. 1 Type 511A Larry Garcey
1 Type 515A Jack Holcomb S/N 4544 Electronic Transiston
or 503 MacLeod Instrument North Bergen, New Jersey
THIS 'N THAT Corp.
Micro-Dyne Division 1 Type 515A Gilbert Levy
Occasionally the graticule studs on a 4250 N.W. 10th Avenue S/N 2298 Semi-Con Electronics
Tektronix 5" oscilloscope work loose. Ft. Lauderdale, Fla. River Road
You can r e ~ l a c ethese with a tapped stud
- - Phone: L O . 4-8518 Edgewater, New Jersey
Tektronix Instrument-Repair Facilities: There is a fully-equipped and properly-staffed Tektronix In-
strument Repair Station near you. Ask your Field Engineer about Tektronix Instrument-Repair facilities. A-2029
USEFUL I N F O R M A T I O N FOR USERS O F TEKTRONIX INSTRUMENTS
OCTOBER 1960
C O P Y R I G H T 1959 T E K T R O N I X . INC. P R I N T E D I N U. 8. A.
VERTICAL AMPLIFIER TUBE PROBLEM ~f o r d i n a r y soltler o r t h e application o f intl t h e coriiplcted surface will b e
too m u c h heat \\.ill break tliis bond. ; m o o t h e r if you s a n d a bit bet\vcen
T h e T y p e 531A, 533, 545A, 551, a n d \\re rcconi~iientltlie use of a solder con- :oats.
555 i n s t r u m e n t s use 6 D K 6 v a c u u m tubes taining a b o u t 3% silver \vhen soldering Surface coat, t h e desira1)le type of resin
in t h e distributed-amplifier section of 311 T e l i t ~ ~ ~ii is s ~ - u ~ i l e n t s . h i s type of
n t T -or this \ v o ~ - k ,is m a d e h y several com-
t h e i r vertical-deflection circuits. M o s t solder is o i t e n uscd in printed circuitl-y ~ a n i c s . Y o u r supplier caii provide you
6 D K 6 t u b e s develop c a t h o d e interface antl slioultl b e readily available from ivith measuretl a m o u n t s of resin a n d cat-
a f t e r a f e w h u n d r e d liours of operation in y o u r local supply source. If you e s p e r - :llyst a s ivell a s a 2" inch I ~ r u s ht o a p p l y
t h e s e circuits. T e s t s m a d e a t o u r factory ience difficulty in obtaining this soltler, ; I I C coating. T h e brusli should have a
( a n d in tlie field) have s h o w n that cer- it m a y b e o r d e r e d t h r o u g h y o n r T e k t r o n i s ipecial resin-resistant glue t o hold t h e
tain commercially-available 6DK6's, wlicn Fieltl Office. A s k for Tektl-onis t i ~ ~ r n b c r hristles.
used in these circuits, develop soniewhat 251-514 Solder, Silver Bearing 1 # spool Cost of tlic resin, catalyst arid I ~ r u s ht o
less cathode-interface resistance. If y o u (3% silver). P r i c e $3.50. d o Jack's joh \vas $5.50.
a r e h a v i n g trouble with o n e of t h e above
i n s t r u m e n t s , w e s u g g e s t a call t o y o u r T l i e fan m o t o r s of m o s t T e k t r o n i s in-
local T e k t r o n i s Field Engineer. H e \vill s t r u m e n t s s l i o ~ ~ l t b e oiled 1x1-iotlically
l
b e g l a d t o help you pill-point t h e tl-ouble SILICON RECTIFIER MOD KITS
(see tlie maintenance section of y o u r
a n d s u g g e s t r e c o ~ n m e n d e dcorrective mea- instruction m a n u a l ) . A couple of drops I3clow is a partial list of t h e currently
sures. o n tlic end of a toothpick is sufficient. A available silicon rectifier field modification
good suggestion would he t o oil tlie kits. T h e s e kits replace tlie selenium
m o t o r every t i m e t h e air filter is cleaned. rectiiiers in t h e low-voltage po\ver Sup-
TYPE 5351545 DELAYING If tlic air cleaner is never cleaned, you ply of s o m e T e k t r o n i s instruments with
SWEEP-RANGE can oil t h e new m o t o r you install! t h e silicon t y p e rectifiers. T h e s e m o r e
MODIFICATION KIT reliable rectifiers give longer service arid
AN INEXPENSIVE COATING FOR tlie kits a r e designed t o be installed with
T h e s w e e p delay available in a T y p e WORK BENCH SURFACES a m i n i m u m of effort.
535 o r 545 oscilloscope can b e increased
o n e h u n d r e d fold. A nlodification t h a t
, .
J a c k 13annistcr, a 1 eliti-onis Field
E a c h kit contains a prcwirctl chassis
with silicon rectifiers mounted, stcp-by-
e x t e n d s t h e upper limits of tlie sweep llaintenance Engineer, l ~ a s sent in a sug- s t e p instructions, photos, schematic a n d
d e l a y t o 10 seconds ( u p p e r limit of origin- gestion for i m p r o v i n g t h e surface o f a p a r t s list.
al equipment is 0.1 second) is available w o r k bcncli. 1-Ie coated his bench top W e strongly rcconimend t h a t you place
in kit f o r m . T h e desirable feature of with a n epoxy resin. I n addition t o be- y o u r o r d e r for these kits tlirougli y o u r
c o n t i n u o u s calibrated a d j u s t m e n t h a s i n g easy t o I i e ~ l ) clean, t h e resin \\.cars Tcliti-onix Field Engineer. H e can apply
b e e n retained a n d a n y period of delay a\vay a t a m u c h slo\vcr rate than mason- t h e special consitlerations necessary when
f r o m 1.5 microsecond t o 10 seconds can itc a u d liceps O I I C {I-on1 g o u g i n g a hole o r d e r i n g s o m e of tlie kits antl t h u s assure
b e accurately selected. in tlie \vorli bench \vlien turning instru- y o u speedy delivery of t h e correct ltit for
T l i e modification is accomplished b y ments-especially t h e older sqnare-cor- y o u r instrument.
replacing t h e s t a n d a r d 2 ~ n i c r o s c c o ~ ~ d / c m 11ered OIleS-over.
t o 10 millisecond/cm delaying-sweep Jack first faced t h e i r o n t of his I ~ e n c h T y p e 310 Oscilloscope, all serial n u m -
r a n g e w i t h a 3 microsccond/crn t o 1 sec- with \vood t o e l i m i ~ i a t ea nietal rim a n d b e r s I)elo\\; 7141. O r d e r T e k t r o n i s T y p e
o n d / c m range. t l ~ e n put t h e resin o v e r tliis \vood also. 310 Silicon Rectifier Modification Kit,
T h i s modification applies only t o tlie T h e resin sticks ~ v e l lt o masonite, \vootl, T e k n u m b e r 040-195. Price: $30.00.
T y p e 535 a n d T y p e 545 instruments-all painted metal a n d plastic n.ood. R e s u r e
T y p e 513 Oscilloscope, all serial n u m -
serial n u m b e r s . T h e T y p e s 535A a n d t h e plastic ~ v o o dis coniplctely d r y I ~ e f o r e
bers. O r d e r T e k t r o n i s T y p e 513 Silicon
535A i n s t r u m e n t s c o m e equipped with a t h e resin is applied, o t l ~ e r \ v i s ct h e resin
Rectifier Mod Kit, T e k n u m b e r 030-211.
2 microsecond/cm t o 1 second/cm de- t e n d s t o s t a y soft o v e r it. T h e tnaterial
P r i c e : $30.00
laying-sweep range. t o be coverctl slioultl b e clean a n d free
T h e modification kit contains a wired- o i \ \ a s . All cigarette o r soldering-iron T y p c 515 o r 5 l 5 A Oscilloscopes, serial
s\vitch assenibly, step-by-step instructions, b u r n s s l ~ o u l t l b e sanded tloivn t o clean nuriibcrs b c l o ~ v 1030. 0 1 - d e r T e l i t r o n i s
photos, schematic anti p a r t s list. O r d e r tnaterial-the resin doesn't \\.ant t o stick T y p e 515/515A Silicon Rectifier 3Iod Kit,
t l ~ r o u g h o u r T e k t r o n i s Fieltl Oificc. A s k
y t o c h a r r e d si~rfaces-and a n y holes, T e k n u m b e r 030-205. P r i c e $21.00.
for T y p e 535/535 1 second/cni Delaying gouges, o r i n t l e ~ ~ t a t i o n s
filled \vitli plastic
T y p c R l l l j Oscilloscope, serial num-
S w e e p - R a n g e llotlification K i t , T c k n u n - \vootl. C a r e should b e uscd in tliis phase
b e r s belo\\, 756. O r d e r T e k t r o n i s T y p c
b e r 030-1 79. P r i c e is $30.00. a s tlic resin is clear, slightly a n i l ~ e r in
R l I l 5 Silicon Rectifier M o d K i t , T e k
color a n d t e n d s t o accentuate a n y messy
n u m b e r 010-208. P r i c e : $35.00.
'\vorIi. \\'ark tlie I-esin in \\-ell. I t has a
tendency t o n o t stick t o tlic s i ~ r i a c c\vhile T y p e 524 Oscilloscope. T h e r e a r e spec-
THIS'N THAT
it is liquid a11t1\vo~-liing into t l ~ e
it surface ial considerations t o be m a d e \viicn o r -
I n T e k t r o n i x i n s t r u m e n t s , a special sil- liclps t o o v e r c o m e this fault. O n c e d r y d e r i n g a silicon rectiiier for this instru-
ver-bearing soltler e s t a l ~ l i s h e st h e I ~ o n dt o it a d h e r e s vcl-y u e l l . \I q u a r t provides a nient. Consult y o u r T e k t r o n i s Fieltl En-
t h e ceramic terminal strips. Rcpeatctl use t\vo coat finish for a 6's 3' 1)cncli t o p
-
gineer I ~ c f o r cplacing your order.
T y p e 525 Television Waveform hioni- T y p e 531 Dr. H a r r y Williams CORRECTION
tor, serial numbers below 526. O r d e r Ser. # 114 Pharmacology Department
T e k t r o n i x T y p e 525 Silicon Rectifier Mod with E m o r y University A typographical error slipped past the
Kit, T e k number 040-207. Price: $28.00. Type C Atlanta, Georgia not so" eagle eye of your e d ~ t o rin the
Plug-In .ugust Issue of S E R V I C E S C O P E I n
A s previously stated, this is but a Unit Ser. ie article "Type 536 Amplifier Rlodif~-
partial list of the available silicon rectifier #I16 at~on",the tube type number 6340 should
modification kits. Contact your Tektronix . T y p e 53D sad 6360.
Field Engineer for information on in- Ser. #I18
s t r u m e n t s not included in this list.
I T y p e 53,'- Argonaut
54C Ser. A t t n : Ken Rlollenauer rYPE 5240 OR 524AD TRANSFORMER
IMPROVED TRIGGERING LEVEL #7414 250 llitldlefield Road MODIFICATION KIT
CONTROL WHEN TRIGGERING FROM Menlo Park, California.
EXTERNAL WAVEFORMS
T h e T R I G G E R I N G L E V E L control INSTRUMENTS TO TRADE
of a T y p e 530 Series, a Type 540 Series,
o r a T y p e 551 Oscilloscope becomes ex- 1 T y p e 532 John Kimber
t r e m e l y sensitive when the instrument is wants a Transitron Electronics
triggered exter~lallyfrom very low ampli- T y p e 575 Denver, Colorado
tude signals. T o some, the ability to
trigger reliably from these signals is im- H e is willing to pay some additional
portant. hIore so than the ability to range for the T y p e 575.
t h r o u g h the positive o r negative slope of
relatively large signals. For these people,
T e k t r o n i x Field Engineer, John hlulvcy, USED INSTRUMENTS WANTED
s u g g e s t s the follo\ving modification: Lo-
cate, o n the T R I G G E R I N G M O D E - 6 T y p e 514's DeVry Technical Institute
T R I G G E R S L O P E s\vitcIl a 56 k, % \v, o r 524's Rrentlan Hawkins Early models of the Type 524D and
10% resistor antl a 0.001 pi, 500 v capaci- 4141 W . Relmont Ave. 24AD (instruments with serial numbers
tor. T h e s e are designated on the Type Chicago, Ill. telow 5729) used 6 x 4 rectifier tubes in
531, 535, 541, and 545 schematics as R1S heir low-voltage po\rer supply. An in-
and C17; on the Type 533, 543, and 551 1 T y p e 524 o r Robert Breed ernal short developing in this tube could
schematics as R21 antl C20; and on the any Tek- P . 0 . Box 372 ause a current surge through the trans-
T y p e 532 schematic as R319 and C317 tronix Camden 1, New Jersey ormer that ~ v o u l d d a n ~ a g ethe transfor-
J u m p e r the top of the resistor to the tor Wide-Band ner antl require its replacement. A fuse
o f t h e capacitor. This reduces, by almos (10 RIC) .esistor can be installed in the plate leads
10 to 1, the sensitivity of the T R I G G E F scope )f the 6 x 4 tubes to prevent this damage.
L E V E L control to low-amplitude exter 9 modification kit containing schematics,
nal signals. A switch can be wired in t h , 1 T y p e 530 o r L.F. Gilbert nstructions and necessary components to
jumper to allow the operator to selec 540 Series Bailey Meter Company n a k e this installation is available. Ask
the correct triggering-level range for t h Price $300 1040 Ivanhoe Road r o ~ Tektronix Field Engineer for Type
~ r
external triggers being used. to $400 Cleveland 10, Ohio j24D o r 524AD Transformer Protective
T h i s modification applies only t o th (condition hiodification Kit, T e k n u ~ n l x r 040-196.
instruments in the Type 530 and 5 8 4 n o object) There is no charge for this kit.
S2ries antl to the Type 551. T h e T y p
53lA, 535A, 541A, 545A, and 555 trigge 1 T y p e 517 W a r r e n F. Stubbins
reliably on external signals of from 0.2 University of Cincinnati
to 10 v. Eden and Uethesda Ave. FLASH!
Cinejnnati 21, Ohio HOT SCOPES!
USED INSTRUMENTS FOR SALE W e have just received wort1 from the
Bendis C o n ~ p u t e r Division of Rendix
TROUBLE-SHOOTING HINT Aviation Corporation that Tektronis Type
310 Oscilloscopes have apparently been
If you are troul~letlby an erratic trig- stolen from three of their field engineers.
gering problem in your T y p e 316 Oscillo- Instruments with serial numbers 10415
scope that has defied your efforts to cor- and 10867 tlisappearetl from the Chicago
rect it, you might consider the following area and one \\it11 serial number 11735
infomiation. from the Kansas City, l l i s s o t ~ r iarea. If
you have any information on these instru-
l'elitronix Maintenance Engineer Joe
ments contact Harvey W . Renfeldt, Cus-
Vistica, \\.hen c o n f ~ - o ~ ~ t \\.it11 this pro-
etl
tomer Engineering Computer Division,
blem, d e t e r ~ n i ~ l e d
that the trouble was
T h e Rendis Corporation, 5630 Arbor
caused by about 5 to 1 0 m v of 60 cycle
lritae Strect, Los Angeles 45, Calif.
ripple bet\veen the sub-panel and the
1 Type Pennon Electronics, Inc. s\\-eep cl~assis.H e eliminated the problem Any Telctronis instrument offered for
511AD Ser. 7500 South Garfield Ave. by removing t l ~ e front panel antl sub-panel sale n-itliout a serial number o r one that
#5160 Bell Gardens, California. antl sanding the sub-panel, s\veep sho\vs signs of attempts to alter or re-
chassis and vertical cllassis at theit move the serial number should I,e viewed
1 T y p e 513D Bill Johnson points of contact ~ v i t heach other. Disas- \\.it11 suspicion. If you have an instrument
Ser. #691 Station W P C A-TV, sembly, sanding and reassembly requireti ivitll these indications, contact your local
Ch. 17 about 2% I~ours. Joe says, "I am happy Telctronir Field Office. In most instances
Mermaid Lane to report that after all this the illstrumen1 there al-e ways to trace the instrument
Philadelphia 18, Penn. \vorlicd perfectly." and determine i f it has Ixen stolen o r not.
TEKTRONIX OPENS TWO NEW FIELD TIMING I N A "PINCH"
OFFICES
W i t h the opening of t \ \ o ne\v field of-
f ~ c e s ,t h e servtces offered by a Tektronix
F ~ e l d O f f ~ c ehave been made more con-
v e n ~ e n t l y ava~lable to people in the I n -
d ~ a n a p o l ~Isn d ~ a n aarea and in the section
,
of Callforn~a con~posed of Santa Maria,
Vandenberg AIS Force Base and the San
Fernando Valley areas. T h e o f f ~ c eserv-
ing t h ~ sCal~forniaarea is located in E n - Figure 3
ClIlO. N O T E : This method is not recom-
mended except in instances \\-here a n ac-
T h e Indianapolis Office is located a t curate time mark generatos such as the
T h e follo\ving method may be used to Tektronis Type 180 is not available. See
3937 North Keystone Avenue, Indian- adjust the sweep timing in any T e k t r o n i s
apolis 5, Indiana. T h e phone number is your Tektronis Field Engineer for a copy
oscilloscope which has a variable siveep- o f tlie factory recomn~ended calibration
Liberty 6-2408 or 6-2409. At this location time control and triggering-level control.
you can call on Tektronis Field Engineer procedure.
The oscilloscope itself is the only instru- 311h-e Nash
T e d Anderson or Fieltl Secretary Ann ment used in making this adjustment.
Dollars to avail yourself of the field ser- Customer Service Staff
T h e 60-cycle line frequency and the trig- Tektronis, Inc.
vices.
ger circuit are used to establish a time
A HELPING HAND
1 ."
Fort
reference. Set the T R I G G E R S L O P E
control to + o r - L I N E and the T R I G -
Wayne
T e k t ~ o n i xFieltl Engineers are in daily
G E R I N G M O D E control to A C o r DC. contact with users of cathode-ray oscil-
/ iafaye++r
Using a probe, connect the output of the
trigger circuit to the vertical input anti
loscopes in almost all branches of in-
dustry and research. These contacts af-
set tlie T I M E / C h f and V A R I A B L E ford a continually varying experience in
T I h l E / C M to display one cycle in 10 c m oscilloscope uses and applications. F o r
of graticule length (see Fig. 1). W i t h help \vitli an oscilloscope problem that
the T R I G G E R I N G L E V E L control, ad- has defied your efforts at solution o r one
just the display until the first portion that you feel may have a better solution,
(negative half cycle) dccupies 4.8 crn of consult the Tektronix Fieltl Engineer in
gratieule length (see Fig. 2). This estab- your area. H e is no farther away than
lishes a time reference of 8 ~nilliseconds. your telephone antl he may have the an-
swer to your problem. I n any event he
will be happy to consult with you and
sho\v how to use Tektronix instrunients
to their fullest capabilities.
CHANGE I N STANDARD P2 PHOSPHOR
A new i11il)rovctl-type phosphor is now
usctl in all 'l'ektronis cathode-I-ay tubes
T h e Encino Office is located a t 1741E calling for a P2 p1iospho1-. This new
Ventur-a I3oulevard, Encino, California Type P2 phosplior can be distinguished
A phone call to State 8-5170 will put yo^ by its I ~ l u e fluorcsccnce. T h e older P 2
in touch w ~ t hTektronis Field Engineer: Figure 1 pliosplior, as you will recall, fluoresced
Duncan Doane, Jim Cook, o r Fieltl Sec green.
retary Phyllis Lliorth. This staff wil .
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