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OCTOBER 1959
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.
SAVING CONTAMINATED filter from installation and flush dirt AVOID BURNING CRT SCREENS
OSCILLOSCOPES o r grease out of filter with a stream
of hot water o r steam. T u r n i n g down the intensity before
T e k t r o n i x Field Engineer Fred Lenc- changing plug-1x1 units in Tektronix
zynski o n a call to a Nuclear Re- (2) I f load is too heavy for treatment in
(1) ahove, prepare mild soap o r deter- Oscilloscopes eliminates a n y danger of
search operation discoveretl they xvere burning the C R T screen during this
destroying Tektronix scopes that had gent solution in pan o r sink deep
enough to cover fil- operation.
become contaminated. T h e y were very
happy t o learn that Tektronix scopes ter when laid flat.
Agitate filter up and USED INSTRUMENTS WANTED
could be washed with the Kelite solution
and retrieved from the atomic junk down in this solution 1 524 o r Frank Valencic
man. A s k your Tektronis Field Engineer until grease or dirt 514 718 E. 200 St.
for details on this money saving opera- is loosened and car- Cleveland 19, Ohio
tion. ried off filter.
1 315 o r Robert Anderson
(3) Rinse filter antl 511 University of Illinois
HIGH Gm TUBES OSCILLATING IN let dry. Chicago
TYPE 570 (4) Dip or spray fil- Control Systems Lab.
ter wit11 fresh Filter Urbana, Illinois
T h e r e is a tendency for some h ~ g l iC;m Coat, o r other ap- P h o n e : E M p i r e 7-6611
tubes being tested with the T y p e 570 proved adhesive."
Characteristic-Curve Tracer to oscillate 1 511, 514 Dr. R.B. Marion,
Filter Coat should be easy to get locally; o r 515 Physicist
despite t h e use of resistor patch cords look in the Classified Section of your
and shielding with Beltlen braid. University of Maryland
phone book for R P Air Filters, o r E Z U. S. Rt. # 1
Tektronix Field E n g ~ n e e r Earl Wil- Kleen Air Filters. If you have a n y
l ~ a l n sreports considerable success in sup- College P a r k , Maryland
trouble, we can supply you from Portland
pressing these o s c ~ l l a t ~ o n through the
s 1 511 A.C. Nielsen Company
a t $1.00 per pint.
use of Ferramic cores installed on each 807 Howard Street
bare-wire lead connecting pin jack to tube CHANGING TO SlLlCON RECTIFIERS Evanston, Illinois
socket lug. Ferramic cores are the ferrite Phone H O 5-4400
material beads that can be strung on Fieltl-Rfotlificatio~~ Kits for sevcral T e k -
t r o n i s Oscilloscopes facilitate changing 1 512 Willis Smith
wire to act as suppressors to high-fre- 5449 L a Jolla H e r m o s a
from selenium to silicon rectifiers for in-
quency currents flowing in wire. Earl Ave.
creased reliability. Kits contain all neces-
says that brief test did not show that use L a Jolla, California
sary parts and instructions.
of beads could eliminate possible nced 1 310 (or H.J. Wood, Jr.
for resistor patch cords, but he was able Field-Modification Kit 040-201 . . . . . . $60
315 Garwood Development
to display curves he had not seen to date. f o r T y p e 531 serial numbers 101
512 Lab.
through 7600
f o r T y p e 535 serial numbers 101
514 P. 0 . Box 412
REACTIVATING THE CATHODES 515 L a s Cruces,
through 8627
OF STORED New Mexico
Field-llodification Kit 040-202 . . . . $60 Phone J A 4-4044
for T y p e 531 serial number 7601 and up
for T y p e 535 serial number 8628 and up
for Types RM31, 533, RR133, RM35,
2, QUESTIONS FROM THE FIELD .)
;
A cathode-ray tube that has been in
storage for some time should be "re- 541, R1I41, 543, R3I43, 545, Rh145- Q . I s the H V power supply in the 530-
activated" before being placed in service. all serial num1)ers. 540 Series scopes capable of operating
T o reactivate the cathode, operate the a slave C R T ?
C R T with 8 volts on the heater (other A. Yes, but if there is a regulation pro-
operating conditions normal) for about blem, it may be necessary to change
one hour, and follow with 24 hours of the 6AU5 screen resistor (56 K 2 W )
operation a t normal heater voltage. Dur- to a 47 K o r 39 K 2 W resistor.
ing the reactivation period the beam Q . W h a t is the frequency response of
should be positioned off the face of the P170CF and P500CF probes when
CRT. used with 545/G?
D u e to increased production capacity,
Tektronix is now able to accept large A. W e made some measurements and
SERVICING YOUR AIR FILTERS quantity orders for ceramic terminal found the Pl7OCF to be 3 d b down a t
Reliability of Tektronix Osc~lloscopesis strips. These are the same strips as are 22 mc and the PSOOCF 3 d b down a t
i improved if the washable L u n ~ a l o y air used in current production instruments: 11.7 mc.
fllter is clean. T h e filters should be in- one, hvo, and three notch strips with one- Q.I s it possible to use a 5BG o r 5 B H
spected every three o r four months, for yoke mounting, and four, seven, nine, with the 530A and 540A?
dirt content, by holding the filter up to antl eleven notch strips with two-yoke A . Yes, it is possible if other minor
the light. T h e following filter cleaning mounting. Yolies are made of nylon, changes are made. T h e 5 B G c r t is
instructions are given by the filter and are press-fit mounted to the chassis directly interchangeable with the T533
manufacturer: \vith spacers. Please consult your T e k - crt when it is used in the 531A, 533
"To Clean: tronis Fieltl Engineer for coinplete o r 535A Oscilloscopes except for the
(1) If grease o r dirt load is light, remove particulars and prices. different vertical sensitivities of the
t w o crt's. T h e vertical sensitivities T h e new anode connectors \yere designed total time needed for displaying both
are : so that they would not have to be re- main sweeps. (See note 1)
5BG 11.2 - 13.7 v/cm moved when replacing the C R T . T h e 5. Set the Delaying Sweep Delay-Time
T533 8.6 - 10.5 v/cm connector mounts on the shield and when Multiplier (Delay-Time Multiplier)*
T h e Vertical Gain Adj. in the scope the C R T is installed the brush makes to the desired delay time needed to
should have enough range to overcome contact with the C R T anode button. a r m the Main Sweep ( T i m e Base A)*
this difference. ( A l t h o u g l ~ changing If the connector is installed after the for its second sweep.
t h e gain means you will have to re- C R T is in place, the brush is apt to be- 6. Connect the + G a t e Main Sweep
t u n e the delay line and possibly the come frayed and bent resulting in a poor ( + G a t e A ) * to the Delaying Sweep
o t h e r coils in the amplifier.) connection. I t is recommended that you Trigger o r External Sweep I n (Time
T h e 5 B H crt is directly interchange- do not remove the connector from the Base R Trigger Input)* and set the
able with the T543 c r t if pins 11 and shield when installing o r tc-placing the Slope ( T i m e Base B Trigger Slope)*
12 on the 5 B H crt are jumperetl to- CRT. switch to the + + ( Int.)* position.
gether with a strap. T h e deflection , --
sensitivities are the same in 110th o f 7. Adjust the Delaying ' ~ w e e p (Time
these crt's. Base 13)* Stability and Triggering
T h e T533 and T543 crt's have nhoto- USE of TYPES 535, 535A, Level controls to trigger on the lead-
etched horizontal deflection plates to 545 and 54549 for DOUBLE SWEEPS ing edge of the main sweep +gate.
minimize flare when the sweep in the W h e n this is properly adjusted it
533 and 543 Oscilloscopes a r e used in T w o single sweeps may be obtained should be possible to get lock out
t h e 50 and 100 times magnifier posi- utilizing the principle that when the after main sweeps.
tion. Horizontal Display switch is placed in
the Main Sweep Delayed ('A Delayed *(Captions in parenthesis apply to
by B')* position, the trigger gate circuit Types 535A and 545A instruments.)
VERTICAL INTERFIELD TEST can be armed either by depressing the
MODIFICATION KIT FOR TYPE 525 TV Note 1 : T h e total delaying sweep time
Reset button o r by a pulse from the delay must be greater than the total time
WAVEFORM MONITOR pickoff circuit. T h u s a sequence can be needed for displaying both main
A modification kit w ~ t hstep-by-step in- set up \vith a short main sweep and a
sweeps, otherwise the delaying sweep
structions is now available. T o permit longer delayed sweep, such that when could be retriggered during the sec-
observation of the V E R T I C A L I N T E R - both sweeps are triggered a t the same
ond main sweep which would allow
F I E L D T E S T S I G N A L which is in- time the main s ~ v e e p will conlplete its continuous sweep operation. I n the
serted between horizontal sync pulses o n cycle antl lock out until the delayed
T y p e 535 and 545 the total delaying
t h e porch of the vertical blanking pulse sweep (througli the delay pickoff) re- sweep time is limited to 10 msec/cm.
of t h e con~positevideo signal. sets the trigger gate circuit; then the
If a total delaying s\veep time in ex-
T h e kit includes all parts, wired V I T main sweep will accept one more trig-
cess of 10 ~ n s e c / c m is required we
chassis, photos and instructions for modi- ger pulse and lock out until the Reset
suggest a K535-S1 modification kit
fying the Type 525 Oscilloscope. Also I ~ u t t o n is pressed. T h e details of this
(Tek #040-063) \vhich gives a maxi-
included are operating instructions and are as follo\vs:
mum delay sweep range of 1 sec/cm.
internal adjustment procedure with This kit is available for $40.00 in-
theory of operation. 1. Set the Horizontal Display switch cluding a new front panel. W h e n
W h e n ordering, please specify T y p e 525 to Main Slveep Nornlal (A)*. ordering please specify the instrument
Vertical Interfield T e s t Modification Kit, type antl serial number.
2. Adjust l l a i u S\veep ( T i m e Rase A ) *
T e k Number 040-171. Price $35.00.
f o r sweep time desired and adjust Note 2: This double sweep type of opera-
triggering controls to trigger in- t ~ o nis applicable to all A to Z plug-
CRT REPLACEMENT TECHNIQUE ternally on the signal to be displayed. iu units, however the T y p e C-A unit
W e have an oc- CONNECTOR
I 3. Reset the Horizontal Display switch can be used in the alternate position
casional to Main S\veep Delayed ('A De- to observe a separate single sweep
layed by B')*. each o f two signals which are tlis-
dicating trouble placed in time. T h e T y p e C-A unit
with the new 4. Set the Delaying Sweep Time/cm is switched a t the end of each main
brush-type C R T ANODE BUTTON ( T i m e Base R , Time/cm o r Delay sweep when used In the alternate posi-
anode connectors. Time)* to a setting greater than the tion.
Tektronix Instrument-Repair Facilities: T h e r e is a fully-equipped and properly-staffed Tektronix I n -