Tektronix 7T11 User manual

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Serial Nu mber
ι 2 F3
Te k t r onix, Inc . 0 Ρ . Ο . Box 500
"
B eaverton, Oregon 97005
"
Ph on e 644-0161
"
Cables : Te
k tronix
070-0986-00

570

WARRANTY
All Tektronix instruments are warranted
against defective materials and
workman
s
h
p
for one year .
Any
questions with
respect
to the war-
ranty
men6
ο ne
d
above should
be taken up
with your
Tektronix
Field Engineer .
Tektronix

repair

and

replacement-
part
ser ν ice i s geared
directly t ο f h
e field, there-
fore α !!
requests for repairs and
replace-
ment
parts should
be directed to the Tek-
tronix Field Office or
representative in your
area
. This procedure
will assure you the
fastest
possible sor ν ico
.
Ρ
!e ase inc! υ cl e the
instrument Type and
Serial or Model Num-
ber with
all requests for
parts or service .
Specifications
and price change privi-
leges reserved .
C σ
pyrigh
t , 'P) 1970 6
by Tektronix, Inc .,
Bo σν er t υ
n,
Oregon . Printed
in th e Uni t ed
States
of America . All rights
reserved .
Contents of this publication
may not be
reproduced in any form
without permission
of the
copyright owner .

S
ECTION 1

SPECIFICATION
TA BLE O F CO
NT EN TS
General Information

1-1
Instrument F eatures

1-1
E lectrical Characteristics

1-1
M echanical Characteristics

1-4
S ECTION 2

OPERATING INSTRUCTIONS
General Information

2-1
Installing the

7T11

2-1
ΤΙΜΕ /DIV Rea d out

2-2
Controls and Connectors

2-3
F irst-Time O p eration

2-4
Setu p Information

2-5
A d justing SWEEPCAL

2-5
Observing α F astrise P ulse

2-6
Triggering Consid erations

2-7
Trigger R ate

2-8
SWEEP RANGE Control

2-8
ΤΙΜΕ /DIV Settings

2-9
TIME POSITION Control

2-9
SCAN Control

2-10
T RIG
LEVEL
and
STABILITY Controls

2-10
Trigger
P
ushbutton
Switches

2-11
PULSE O UT Connector

2-11
U se of
R eal Time M od e

2-11
U sing the

7M11
Delay L ine

2-11
SECTION 3

CIRCUIT DESCRIPTION
T HEORY OF O PERATION
P
age
R eal-Time Sam p ling Theory

3-1
General

3-1
Staircase R am p 3-2
Lead Time

3-3
Sam p les/Division

3-3
Summary

3-3
Add itional R eal-Time Circuits

3-4
Controls Affecting Timing and Delay

3-5
Im p ortant W aveforms

3-6
Se q uential Sam p ling Theory

3-9
Ad d itional Circuits R e q uire d
3-9
Constructing The
Dis p
lay

3-11
W aveform R elationshi p s

3-11
F actors Affecting Dot Density

3-13
B lanking Circuits

3-14
U navoi d able Delay

3-15

TA
BLEO F CO NT EN TS
(co n t)
R
and om
Sam p ling T h eory

3-16
Intro d uction

3-16
R
and
om B loc k Diagram

3-16
R and om
O p eration

3-18
W aveform R elations h i p s

3-18
CI R C UIT A N A L YSIS
R elations h i p to V ertical U nit

3-20
Triggering Circuits

3-22
Internal Triggering

3-22
E
xternal Triggering

3-23
Trigger Slo p e Am p lifier

3-24
Trigger ( Χ 10) Am p lifier

3-24
Sc h mitt Trigger

3-24
HF SY N C

3-26
Arming and Outp
ut Tunnel Dio d es

3-26
Out p ut
Tunnel Diode Circuits

3-28
R eal an d
E q uivalent-Time L ogic

3-29
Start
M ultivibrator

3-29
ΤΤΗ Circuit

3-30
H orizontal Am p lifier

3-33
R eal-Time M ultivibrator

3-34
H orizontal M emory

3-35
Out put Am p lifiers

3-35
H
ol
d -off M ultivibrator (H O MV)

3-35
Slewing R am p 3-39
Strobe Drivers

3-41
Slow R am p Generator

3-41
Slow R am p Inverter and Time P osition Am p 3-43
Dot P osition M emory

3-44
R atemeter

3-45
R atemeter Start Correction Circuits

3-47
Timing Switc h es

3-47
R ea d out L ogic

3-48
S E CTIO N 4

M AI N T
EN
A
N
C
E
P reventive M aintenance

4-1
Troubles h ooting

4-1
Transistor and IC P in Arrangement

4-3
7T11 Troubles h
ooting P rocedure

4-5
Sol d
ering Tec h ni q ues

4-7
Com p onent R e p lacement

4-7
Circuit Board s

4-8
P in Soc k ets and Connectors

4-8
Tunnel Dio de C R 28

4-8
Switc h Rep lacement

4-9
Instrument R ep ac k aging

4-11
Circuit B oard Connections and Com p onent
L ocations

4-12 to 4-18

TA BLE O F CO N T EN TS (co n t)
S E CTIO N 5

PERF O RM A NCEC HE CK /CA L I BR ATIO N
Introduction

5-1
Test Eq ui p ment R e q uire d 5-1
Sh ort F orm P roce d ure

5-2
Calibration an d P erformance C h eck 5-4
A d j ust +10 V olts

5-7
C h ec k Manual Scan and Ad j ust Swee p
Cal and P osition

5-7
Timing Accuracy

5-7
Time P osition R ange

5-9
A d j ust Timing

5-9
A d j ust R an d om Timing

5-11
A d j ust Trig L evel

5-12
A d j ust Stability

5-12
A d j ust E xternal Trigger Zero

5-13
A d j ust Ν F Sync

5-13
A d j ust Out p ut B ias

5-14
C heck Triggering

5-15
C heck Dis p lay J itter

5-16
C heck P ulse Out into 50 St

5-19
C heck Trigger K ic k out

5-19
Trigger
H
oldoff

5-20
Strobe K ic kback into Trigger

5-20
M inimum Trigger R ate in R and om

5-21
R ep etition Scan R ate

5-21
Swee p OutR ange

5-21
E xternal In p ut

5-21
S E CTIO N 6

ELE CT R ICA L P A R TS L IST
Abbreviations and Symbols
P arts Or d ering Information
In d ex of E lectrical P arts L ist
E lectrical P arts L ist
SECTION 7

DIAG R AM S AN D ME CH A N ICA L P A RTS I LLU ST R ATIO N S
Diagrams
M ech anical P arts Illustrations
Accessories
R e pac k aging Instructions
S E CTIO N 8

ME C H A NICA L P A R
TS L IST
CH A N G E I N F O RM ATIO N
M ech anical P
arts
L
ist Information
In dex of
M
ech anical P arts Illustrations
M
ec h anical
P
arts L ist
Abbreviations and symbols use d in t h
is manual are based on or
ta ken d irectly from IEEE Stand ar d 260 "Stan d
ar d Symbols for
U nits", MIL-STD-12B and ot her stan d ar d s of t h e electronics
in d ustry . C
h ange information, if any, is locate d at t h e rear of t h is
manual .

Fig . 1-1 .

M1 Sampling Sweep Unit .

S
E
CTIO N 1
SPECIFICATION
Ch ange information, if any, affecting t h is sectio n will be
fo u nd at t h e
rear
of t h e
manual .
General Information

free of trigger j itter or double triggering, even
at low
trigger
T he

7T11 Sam p ling un it is designe d for use in Te k tro n ix

re p
etitio n rates or w h en using α sq uare wave as t he i n put
7000-series

oscillosco p es .

Several

p lug-in

combinations,

trigger signal . Α recovery time con trol is not n eeded .
i n clu d i n gα 7T1 1, are sh ow n in F ig . 1-2 . Α 7511 must be in
t h e compartment to t he left of, and ad j acent to, t he com-
pa r tment in w h ic h t he 7 Τ 11 is operate d . T h erefore, two

Selecting ΕΧΤ HF SY NC p ermits using fr eq uencies of 1
GH z to ap pr oximately 12 GH z as t h e trigger i np ut source .
7T1 11's are not used in t he same mainframe .

W
it h HF SY N C selecte d , the signal connecte d to t he T R IG
I NPU T connector is route d to αb uilt-in synch ronizer, thus
In F ig . 1-2 Α t h e 7 Τ 11 is s h ow n in t he " Α " H orizontal

p
ermitting Χ band signals to be viewe d .
com p artme n t of t he oscillosco pe . T he V ertical M od e and
H orizo n tal M ode p us h button s, provi d ing useful presenta-

Excelle nt swee p li n earity is p rovided w hen using t he
tions, are d esignate d for p lug-in configurations Α , Β , and C .

7 Τ 11 .

The

timi ng

circuitry

in

t h e

7 Τ 11

uses α time
F or t he configuratio n of F ig . 1-2 Α , fo u r combinations are
meas u reme n t rat h er t han α time p rogramming p rocess for
s h own . P lug-in arra n gements ot h er t h an t h ose sh own i n F ig .

horizontal sam p le positio n ing on all e q uivalent-time swee p
1-2 are p ossible .

r anges . Duri ng both ran d om and Seq uential op eration t he
h o r izo n tal p ositio n of t he d ot on t h e screen is d etermine d
_

An alte r nate to t h e con figuration s h own in F ig . 11-213 is

by measuring the time interval b etween strobe and trigger .
wit h t h e "LEF T" or " Β" or both of t h ese mainframe com-

This met hod results in improve d timing linea r ity and α
empty . T h e 7 Μ 11 may be use d in any available

re d uction in d is p lay j itter . T he accuracy of sweep timing
p artments
mai n frame com p a r tment o r o p erate d out of t h e main frame .

and
linearity ma ke it unnecessary, d uri ng e q uivalent time
F or furt h er information, see t he O p erating I n structions

sam p li n g, to exclu de t h e swee p start from accuracy s p ecifi-
section of t h is ma n ual un d er the h eading of General

r ations .
O p erating I nformation .
Internal triggeri n g, or
a
ny of t h ree
modes of extern
al
triggering
can be
selecte d by using t he front panel
p us
hbuttons . Α Sc h mitt trigger circuit is used exce p t
w hen HF SY N C is selecte d . W it h ΕΧΤ 50 Ω i nput
selecte d , t h e Sch mitt ci r cuit p rovi d es j itter free triggering
from in p ut trigger signals from DC to 1 G H z . T he dis p lay is
Α
C h aracteristics
Instrument F eatures

T h e followi ng c h aracteristics apply over an ambient tem-
p erature range of 0 ° C to +50 ° C at altitu d es up to 15,000
T h e 7 Τ 11 feat u res α wide range of swee p rates using

feet an d after α five-mi n ute warm u p, p roviding t he instru-
real-ti m e and e q uivalent-ti m e sam p ling . Conce n tric switc h es

°C and
select t h e sweep range and time p osition r ange in d ifferent

me nt was calibrated at α tem p erature b etwee n +20
+30 ° C . D u ring non-operation, donot su bj ect t he 7 Τ 11 to
com b i n atio n s for t h e time/div desired . On eq uivalent time

altitudes a b ove 50,000 f eet or to tem p eratures below
ranges, eit h er se quen tial or ra nd om sam p ling is availa b le .

_
ς
5°C .
U se of random sam p li ng p ermits d is p lay of t he lea d ing e d ge
of fast-rise i n p ut signals wit h ou t t h e use of α signal d elay
line (suc h as t he 7M1 1) or α p retrigger p ulse from t h e sig n al

ELE CT R ICA LC HA R ACT ER ISTICS
source .
Ch aracte r istic

P erforma n ce R e qu i r eme n t
ΤΙΜΕ /DI V
S WEEP RAT ES
7 Τ 11
Cali b rate d from 5 ms/ d iv to 10
p s/div, selectable
in
α
1, 2,
5
se-
q uen ce,
using
S
WEEP R A N G Ea nd
ΤΙΜΕ /DI V co n trols .

Specification-7T11
E q uivalent Time
ΙΑ )
ELE CT R ICA L C HA R ACT ER ISTICS (cont)

ELE CT RICA L C H A R ACT ER ISTICS (cont)
C h aracteristic

Ι

Performan
ce R
e q uirement

C h aracteristic

I

P erformance R equiremen t
Accuracy
R eal Time
L eft R ig h t
b la nk
S WEEP
R AT E S (cont)

S WEEP R AT E S (cont)
5μ s/ d iv to 10 p s/ d iv using t he 50
μ s to 50
n
s
Time P
osition
R
anges .
W
it
h in
3% ο .
7S11
Ι
7S11
Ι
7 Τ 11
Ι
7 Μ 11
7 Α -- Ι 7S11 Ι 7 Τ 11 Ι 7B--
On 5 ms
5 ms/ d iv to .1 μ s/ d iv usi ng t he 50

TIME POS
ms to .5 ms Time P ositio n R a n ges .

RNG
Plug-in
Co n fig u ratio n
7S11 Ι 7S11 Ι 7Τ 11
VER TICA L
M
OD
E
Accuracy
On 50 ms
TIME POS
RNG
Ι = Η ~ Η
ΓΙ L Ι 1~1
Fig . 1- 2 . Several plug-i n con fig u ratio n s usi ng t h e 7711 a nd α 7000-series oscillosco pe .
W it h in 3% ο , beginning 250 μ s after
un delaye d sweep start .
W it h in 3% ο , beginning
25 μ
s after
und elaye d swee p start
.
M ai n frame Switching
HOR IZO N TA L M OD E
LEF T
A L
T ADD CHO P R IG H T 11

Α

A L T C H O PΒ
Χ
Γ
~-
Η
Ι
Η

ΕΧΤ HF SY N C
*Sinewave
Triggering
C h aracteristic

Ι

Performance R eq uirement

C h a r acteristic

I

Perfo r mance R e qu iremen t
VA R IA BLE
( ΤΙΜΕ /DI V )
R ange
Input R esistance
ΕΧΤ 50 Ω
ΕΧΤ 1 ΜΩ
I n ternal
Specification-7T11
ELE CT R ICA LC H A R ACT ER ISTICS (cont)

ELE CT R ICA L CH A R ACT ER ISTICS (cont)
On 0 .5 ms
TIME POS
RN G
Sensitivity
R an ge
E xternal
Χ 1 Trig
Amp
Χ 10 Trig
Amp
50 Ω I n pu t
Sensitivity
R
a
n
ge
Χ 1
Trig
Am
p
Χ
10 Trig
Am
p
Safe
Overload
REV . Β , S
EP T .
1977
S WEEP R AT E S (cont)

T R IGG ER I NG (co n t)
W it h in 3 ° / ο , begi nn ing 2 .5, μ s after
undelayed sweep start, or after 500
ns from start of displaye d
portion
of sweep . Does not
inclu
de 100
ns/
div an d 200 ns/ d iv
p ositions
.
E xte n
ds
fastest sweep rate to at
least 4 ps/ d iv . P ermits increasing
t h e spee d of all sweep rates to at
least 2 .5 times t
he
calibrate
dsp ee d .
T R IGG ER I NG
50 Ω with i n 10% .
1 ΜΩ wit h i n 5% .
1 ΜΩ wit h in 5% .
1
ΜΩ
In
p
ut
HFSY N
C
I n
put
Safe
Overload
Display
J itter
Sensitivity
R a n ge
Χ 1 T r ig
Am
p
Χ 10 Trig
Am p
Safe
Overload
Sensitivity
R ange
125
m V
to
1 V Ρ - Ρ at vertical in-

50
Ω
a
n
d
1 ΜΩ
pu
t (5
kH z
to
500 MHz) .

Tr i ggering
12 .5 m V to 1 V Ρ - Ρ at vertical in-
p u t (5 kH z to 50 MHz) .
*NOTE
Trigger circuits will operate to DC
with pulse triggering, except for HF
SY NC .
12 .5 mV to 2 V ( Ρ - Ρ ), DC to 1 G H z .
1 .25 mV to 2 V ( Ρ - Ρ ), 1 kH z to 50
MHz .
2 V (DC
+peak
AC) .
Sequ ential Mode
R and omMo d e
HF SY NC
R an d om or
Se qu ential
Mode
12 .5 mV to2 V (P-P), DCto100
MH z .
1 .25 m V to 2 V (P-P), 1 kH z to 50
MH z .
100 V DC or 100 V (P-P) to 1 kH z ;
derate d6 d B /octave above 1 kH z to
5 V (P-P) .
10 m V to 500 m V (pea k -pea k )
at
1
G H z ; 200 m V to 500 mV (pea k -
p ea k ) at 12 .4 G H z .
2 V ( peak -pea k ) .
10 ps or less at fastest S WEEP
R A N G
E p
osition (f u lly CC W ) ; 0 .4
d ivisions or less at remaining six
positions of S
WEEP R AN
G
E ;
measureme
n
ts ma d
e
un
d er
o p ti-
mum
trigger con d itions .
30 p s or less at fastest S WEEP
RANGE
p
ositio n (f u lly CC W ) ; one
division or less at remaining six
p ositions of S WEEP R A N G E ;
meas u reme n ts made un d er opti-
m u m trigger con ditio n s .
20 p s or less wit h α12 .4 GH z, 200
m V ( p ea k -pea k ) signal ; measure d
under optimu m trigger conditions .

Specification-7T11
ELE CT R ICA L C
H A R ACT ER ISTICS (cont)

ELE CT R ICA L C H A R ACT ER ISTICS (cont)
C h a r acte r istic

Pe r formance R e q uirement

C h aracte r istic
_~

P erformance R e q uirement
PUL S
E
OU
T (i n to
50 Ω )
Am p litu de
R isetime
Trigge r K ic kout
M i n imum Trigge r
R ate in R AN DO M
M ode
Sca nR ate
REPETITIVE
SCA
N
Deflectio n F actor
S WEEP CA L
TR IGG ER I N G (co n
t)

H OR IZO N TA L D EFLE CTIO N SYST E
M
(cont)
Positive-goi n g p ulse of at least 400
mV .
2 .5 ns or
less .
±2
m
V or less into 50 Ω (except
HF SY N
C) .
100 Hz .
SL O W R A
MP
G
ENER ATO R
Conti n uously varia b le from less
t han 2
sweeps/sec :
to at least 40
sweeps/sec .
H O R IZO N TA
L D EFLECTIO N SYST EM
Pe r mits a d j ustment of
d eflection
factor fo r all 7000-se
r ies main-
frames .
EXT ERN A L I NPU T
In p
ut R esistance
Deflection Factor
Maximum In p ut
Voltage
S WEEP O UT
Dimensio n s
Heig h t
W i dth
Len gt h (incl ud i n g
fro n t p anel kn obs
an
d rea r co nn ecto r
)
Constructio n
Accessories
100 k Ω with i n 10% .
Contin uou
sly
varia b le from 10 V to
1
V/ d
iv .
100 V (DC +
peak AC)
.
+5
V to-5 V
ME C
H
A
N ICA L C H A R ACT ER ISTICS
-5 inc h es .
-2'/ α inc h es .
14'/2 i nch es .
Alumi nu m
alloy
ch assis wit h e p oxy
laminated
circuit boar d s . Front
panel is anod
ize d aluminum .
An illustrated list of t h e accesso r ies
su pp lied with t he 7 Τ 11 is at t he
end of t he M ec h a n ical Pa r ts L ist
p ullout p ages .