Tektronix 511 User manual

TYPE 511
CATHODE-RAY
OSCILLOSCOPE
INSTRUCTION
MANUAL
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Manufacturers of Cathode-Ray and V deo Test Instruments
SUNSET HIGHWAY AND BARNES ROAD - P.O.BOX 831 - PORTLAND 7, OREGON, U. S. A.
PHONE: CYp ess 2-2611 CABLES: TEKTRONIX

CONTENTS
GENERAL DESCRIPTION SECTION 1
Character st cs. Funct ons of Controls and B nd ng Posts.
OPERATING INSTRUCTIONS SECTION 2
F rst-T me Operat on.
Sweep C rcu t Adjustments--Adjustment of sweep stab l ty. Funct on
of tr gger selector. Adjustment of tr gger ampl tude. Adjustment of
sweep speed. Recurrent sweep. S ngle sweep. Sweep magn f er. Ext.
sweep nput.
Vert cal Deflect on System--Vert cal ampl f er. D rect connect on to
deflect on plates.
Cal brat on--S gnal-cal brate sw tch. Measurement of s gnal ampl 
tudes .
Intens ty Modulat on (Z axs). Sweep Output. Gate Outputs.
CIRCUIT DESCRIPTION SECTION 3
Cathode-Ray Tube C rcu t.
Sweep C rcu ts--Tr gger phase spl tter. Tr gger Ampl f er. Tr gger
coupl ng d ode. Mult v brator. Unblank ng c rcu t. Gate output genera
tor. Sweep generator. Sweep output cathode follower. Sweep magn f er.
Sweep ampl f er.
Vert cal Deflect on System—Probe. Input attenuator. Vert cal ampl f er.
Cal brator C rcu ts.
Power Supply.
MAINTENANCE SECTION 4
Replacement of Components. Removal of Case. Clean ng. Inspect on.
Trouble Analyz ng and Repa r. Voltage and Cont nu ty Tables. Wave
form Photographs.
ADJUSTMENTS SECTION 5
Operat on on 210-250 Volt L ne. Adjustment of: 225 Volt Regulated
Supply, H gh Voltage Supply, Sweep Speed Cal brat on, Input Attenuator,
Vert cal Ampl f er H.F. Response, Vert cal Ampl f er L.F. Response,
Cal brator Voltage.
Exter or and Inter or Photographs.
PARTS LIST AND DIAGRAMS SECTION 6
VIDEO DELAY NETWORK AND CIRCUIT DIAGRAM SECTION 7
511 AA

NOTE
Th s nstruct on manual has been prepared to
cover TEKTRONIX Type 511, 511A and 511 AD
Osc lloscopes of all ser al number ranges. The
" Type 511A” des gnat on s used throughout the
text and w ll apply to the Type 511 and 511 AD un
less noted otherw se by the nsert on of ser al
number range notat ons. The Type 511 ser al
number range s 101 to 454 and the Type 511A s
455 and up. The Type 511 AD Osc lloscope s
dent cal to the Type 511A except that t ncludes
a factory nstalled Type 1-AD-25 Delay Network.
Text, d agrams, and parts l sts have been expanded
to ncorporate all c rcu t mod f cat ons adopted
dur ng the course of manufacture. The ser al
ranges of nstruments to wh ch var ous mod f 
cat ons were appl ed before sh pp ng from the
factory have been noted wherever necessary.
However, because many nstruments have been
mod f ed n the f eld and out of ser al sequence,
component values and c rcu try of a g ven nstru
ment may d ffer cons derably from those nd cated
n th s manual for ts ser al number. The user s
urged, therefore, to enter whatever changes may
be necessary to br ng th s manual nto agreement
w th the present c rcu try of h s osc lloscope.
When order ng parts, always nclude the fol
low ng nformat on:
1. Instrument Type (511, 511A or 511AD).
2. Instrument Ser al Number (as, SN 9999).
3. Part C rcu t Number (as, R999).
4. Part Descr pt on (value, type, rat ng, toler
ance, etc.).
5. The 6-d g t TEKTRONIX part number (as,
999-999). __________________________________
SAFETY NOTICE
Th s osc lloscope employs dangerously h gh voltages. S nce
some ma ntenance must be performed wth the case removed,
great care should be taken. Use only nsulated tools, stand on
a dry floor and f poss ble keep one hand n your pocket. Care
should also be used n mak ng any connect ons to the deflect on
plates of the cathode-ray tube through the access panel. It s
adv sed that the access panel never be removed unt l the power
has f rst been turned off. The nstrument should not be operated
w th th s protect ve cover removed.
__________________________

SECTION 1
GENERAL DESCRIPTION
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The Tektron x Type 511A Cathode-Ray Osc lloscope s a
w de range, portable nstrument, mak ng poss ble the observa
t on of a w de var ety of electr cal waveshapes. It s pr mar ly
ntended for laboratory and shop use, n the development and
test ng of all types of electron c equ pment.
The Type 511AD Osc lloscope s dent cal to the Type 511A
except that t ncludes a factory- nstalled Type 1-AD-25 Delay
Network.
CHARACTERISTICS
S gnals observable:
1. S ne waves from 10 cycles to 10 me.
2. Pulses of .1 m crosecond to 1/50 sec.
Sweep C rcu t
ampl f er.
Max mum deflect on sens t v ty 1.5 v per cm DC
or peak-to-peak AC. Band w dth, DC to 800 kc
(3 db down at 800 kc).
Vert cal Deflect on C rcu t
Hard tube type, e ther tr ggered or recurrent
as des red.
Sweep Speeds
Cont nuously var able from .01 sec. per cm
to .1 m crosecond per cm.
Tr gger Requ rements
.5 to 15 v (Peak) s ne wave or pulse of e ther
polar ty. Pulse as short as .05 m crosecond w ll
tr gger sat sfactor ly. A key connected between
TRIGGER INPUT and GND. s su table for tr g
ger ng s ngle sweeps. Below S/N 720, a3 v bat
tery and key connected n ser es s su table.
Sw tch perm ts s gnal nput connector on panel
to be connected to deflect on plates d rectly, v a
capac tor (RC =.l sec), v a 1 ampl f er stage, or
v a 2 ampl f er stages.
Input Attenuator
Frequency compensated RC type w th attenua
t on rat os of 2, 4, and8. (S/N 101-454, ATTEN.
5X b nd ng post allows add t onal attenuat on.)
Vert cal Deflect on Sens t v ty
Wthout ampl f er 27 v/cm (5CP1A) or 13
v/cm (5ABP) max mum, 200 v/cm m n mum,
DC or peak-to-peak AC.
Sweep Lag
CRT s unblanked and sweep s operat ng
l nearly n less than. 1 m crosecond after rece pt
of an nf n tely sharp tr gger pulse.
Sweep Magn f cat on
Any des red 20% of the sweep can be spread
over the ent re trace except for sweep speeds
faster than .5 m crosecond per cm.
1 Stage, 2.7 v/cm (5CP1A) or 1.3 v/cm (5ABP)
max mum, 40 v/cm (5CP1A) or 20 v/cm(5ABP)
m n mum.
2 Stages, .27 v/cm (5CP1A) or .13 v/cm(5ABP)
max mum, 4 v/cm (5CP1A) or 2 v/cm (5ABP)
m n mum.
(Sens t v ty s reduced by a factor of 10 when
probe s used.)
IN NO CASE SHOULD THE COMBINED AC AND
DC INPUT VOLTAGES EXCEED 600 V PEAK.
External Sweep Input Input Impedance
DC coupled v a 100 K potent ometer and sweep 1 meg shunted by 40 p/ f (+or-5%) for any
TYPE 511-GENERAL DESCRIPTION PAGE 1-1

sett ng of the nput selector and nput attenuator.
(S/N101-454, 5 meg. shunted by 12 jupf when
us ng the ATTEN. 5X b nd ng post.)
Wth probe, 10 megohms shunted by 14 p/f.
Vert cal Ampl f er Bandwdth
1 stage, down 3 db (Max) (from 1 me response)
at 5 cps and 10 me.
2 stages, down 3 db (Max) (from 1 me response)
at 5 cps and 8 me.
Vert cal Ampl f er Trans ent Response
R set me, 1 stage, .04 m crosecond (10%
to 90%) 2 stages, .05 m crosecond (10% to 90%).
Cal brat ng Voltage
Cl pped s ne wave of power l ne frequency.
S x ranges 0-.3, 0-1, 0-3, 0-10, 0-30, 0-100
volts peak-to-peak. Accuracy for l ne voltages
from 105 to 125 v s +or-5% of full scale. A
pos t on on the SIGNAL CALIBRATE sw tch
allows the use of an external cal brat ng source
when des red. (Below S/N 2406—S ne wave of
power l ne frequency. Three ranges 0-1, 0-10,
0-100 v peak-to-peak.)
Waveforms Ava lable Externally:
Sweep sawtooth, 20 volts peak.
Pos t ve and negat ve gate, 40 v peak, same
durat on as sweep.
Connect on to CRT Cathode
V a .1 / f capac tor. RC=.012 sec.
Accelerat ng voltage on cathode-ray tube, 3KV.
Power Requ rements. 105-125 volts,or210-250
volts, 50-60 cycles, 230 watts. (See Sect on 5.)
We ght, 50 pounds.
D mens ons, 15 1/2” h gh, 121/2" w de,211/2”
deep.
F n sh. P anel, photo - etched alum num w th black
letters. Cab net, gray wr nkle.
FUNCTIONS OF CONTROLS AND BINDING POSTS
A br ef explanat on of the funct on of each control and b nd ng
post s g ven below. For a more deta led explanat on consult
Sect on 3, C rcu t Descr pt on.
PANEL MARKINGS EXPLANATION
INPUT CHAN. SEL.--Gang sw tch perm tt ng the
nput s gnal to be connected to the vert cal
deflect on plates e ther d rectly, v a a .1 pf
capac tor, 1 stage ampl f er, or 2 stage
ampl f er.
INPUT ATTENUATOR--Four pos t on RC com
pensated attenuator located between the SIG
NAL CALIBRATE sw tch and INPUT CHAN.
SEL. for reduc ng the voltage of s gnals wh ch
would otherw se produce excess ve deflect on
or overload the ampl f ers.
VERT. AMPL. ATTEN.--500 ohm potent ometer
n cathode of cathode follower perm ts adjust
ng ga n of s gnal ampl f er.
PANEL MARKINGS EXPLANATION
SIGNAL—CALIBRATE--Sw tch wh ch connects
arm of INPUT ATTENUATOR to EXT. CAL.
b nd ng post, SIGNAL INPUT b nd ng post,
or l ne-frequency cal brat ng voltages.
SIGNAL INPUT--Coax al (b nd ng post,S/N101-
454) connector perm ts connect on of the low-
capac ty probe or b nd ng-post adapter.
ATTEN. 5X--S gnal nput b nd ng post hav ng
h gher mpedance but attenuat ng s gnals 5
t mes (S/N 101-454).
DELAY (511 AD only) --Two pos t on sw tch wh ch
perm ts the Type 1-AD-25 Delay Network to
be sw tched n or out of the v deo ampl f er.
PAGE 1-2 TYPE 511-GENERAL DESCRIPTION

PANEL MARKINGS EXPLANATIONS PANEL MARKINGS EXPLANATIONS
VERT. POSITION--Tw n potent ometers con
troll ng average potent als of vert cal deflec
t on plates and therefore the mage pos t on.
CAL. VOLTAGE--Potent ometer for adjust ng
the cl pped (uncl pped, below S/N 2406) s ne
wave cal brat ng voltage of l ne frequency on
ranges determ ned by the sett ng of the SIG-
NAL-CALIBRATE sw tch.
CRT CATHODE--B nd ng post perm tt ng con
nect on of external modulat ng s gnals to the
cathode of the cathode-ray tube v a a .1 jif
capac tor. RC =.012 sec.
GND.--Connect on to frame of osc lloscope.
ASTIGMATISM--Potent ometer vary ng poten
t al on Anode No. 2 w th respect to the de
flect on plates. Correct adjustment of th s
control makes poss ble a sharp focus of the
mage n both d rect ons s multaneously.
SCALE ILLUM.--Var able res stor controll ng
br ghtness of the lamp wh ch llum nates the
plast c grat cule over the face of the cathode-
ray tube.
INTENSITY--Potent ometer controll ng the av
erage gr d voltage of the CRT and thereby
the br ghtness of the mage.
POWER--On-off sw tch n the AC l ne voltage
supply to the osc lloscope.
FOCUS--Potent ometer controll ng the voltage
appl ed to the focus anode of the CRT and
thereby the sharpness of the mage.
HOR. POSITION--Potent ometer controll ng the
b as appl ed to gr d of one sweep ampl f er
tube and thereby the pos t on of the mage.
SWEEP OUTPUT--B nd ng post connected to
sweep generator v a cathode follower.
SWEEP MAGNIFIER POSITION--Potent ometer
controll ng voltage appl ed to gr d of sweep
magn f er (VI1) and thereby determ n ng por
t on of sweep to be magn f ed. When turned
to OUT sweep magn f er s d sconnected from
the c rcu t.
SWEEP SPEED MULT.--Decade control plus
vern er control sett ng sweep speed and dura
t on wthn range nd cated by SWEEP RANGE.
(A s ngle control, S/N 101-1405).
EXT. SWEEP ATTEN.--Potent ometer control
l ng the fract on of the voltage appl ed to
EXT. SWEEP INPUT b nd ng post wh ch w ll
reach the gr d of the sweep ampl f ers when
the SWEEP RANGE sw tch s set n the EXT.
pos t on.
EXT. SWEEP INPUT - -B nd ng post connect ng to
sweep ampl f er v a EXT. SWEEP ATTEN.
when SWEEP RANGE sw tch s n EXT. pos 
t on. (100 K nput mpedance).
CAL. INPUT--B nd ng post connect ng to EXT.
CAL. pos t on of SIGNAL-CALIBRATE sw tch
perm tt ng an external cal brat ng s gnal
source to be permanently connected to the
osc lloscope.
May be used as aux l ary s gnal nput.
CAL. OUTPUT--B nd ng post connected to arm
of CAL. VOLTAGE potent ometer perm ts
use of nternal cal brat ng voltage as an
external test s gnal of known ampl tude.
+ GATE - - B nd ng post for connect on to the cath
ode of the gate phase spl tter (V8). Th s
furn shes a 40 v peak pos t ve pulse of the
same durat on as the sweep.
-GATE--B nd ng post for connect on v a .1 jif
capac tor to the plate of (V8). Th s furn shes
a 40 v negat ve pulse of the same durat on
as the sweep.
SWEEP RANGE--Gang sw tch select ng appro
pr ate coupl ng capac tors determ n ng mult 
v brator length and sweep speed. When set to
EXT. the sweep ampl f er s connected to
EXT. SWEEP INPUT post n place of the os
c lloscope’s l near sweep.
SWEEP STABILITY--Var able res stor control
l ng b as on gr d of V4 n the mult v brator
c rcu t. Th s b as determ nes whether the
sweep w ll operate recurrently or must be
tr ggered.
TRIGGER SEL.--Sw tch determ n ng source and .
polar ty of tr gger voltage.
TYPE 511-GENERAL DESCRIPTION PAGE |-3

PANEL MARKINGS EXPLANATIONS PANEL MARKINGS EXPLANATIONS
pos t on of TRIGGER SEL. sw tch.
DEFLECTION POLARITY---Three-pos t on le
ver sw tch mounted at the rear s wh ch changes
the V19 operat ng b as and the screen volt
age on V18 and V19, thus prov d ng greater
und storted deflect on when observ ng pulses.
D al read ngs: EXT.
CAL., SIGNAL, X.l,
XI, X10-S/N101-2405
SWEEP SPEED MULT,
was a s ngle d al from
S/N101-1405
TRIGGER AMPL.— Potent ometer controll ng
the b as appl ed to the tr gger ampl f er tube
(V2) and thereby determ n ng the ampl tude
of tr gger s gnals appl ed to the mult v brator.
TRIGGER INPUT— B nd ng post connect ng ex
ternal tr gger sources to +EXT. and -EXT.
+ SIGNAL DEFL. and
arrows added at approx.
S/N 2869
PAGE 1-4 TYPE 5 1 I —GENERAL DESCRIPTION