Tektronix 7A17 User manual

Tektronbc@
PLE AS E C HE C KF O
R
C
H A N G E I NF O RM ATIO N
AT THE RE A R OF
TH IS M A NU A L .
7 Α 17
A MPL I F I ER
I N
ST RU CTIO N M
A NU A L
Te k t r on ix, Inc .
Ρ . Ο .
Box
500
B eave r ton, O r ego n 97077

Serial N um b er
CO
MM ITT E D TO E XC ELLEN C E
070-1263-00

F i r st Pr i n ti ng OCT 1971
Pr o du ct G r o up 42

R evise d A PR 1984

Co
p y r ig h t C 1971 Tek t r o n ix,
Inc
.
All rig h ts r ese r ved .
Co
n tents of t h is p ublication
may n ot b e r e prod uced in any
form wit h out t h e writte n perm issio
n of Te k tro n ix, I n c . .
P
ro
du cts of Te k t r onix, Inc . a n d its subsi
d ia r ies a r e cove r ed
by U .S .
and foreig n p ate n ts a
nd /or pe n di n g p atents .
T EK
T RO N IX, ΤΕΚ , SCO PE-M O
B I LE, and

a r e
r egiste r e d tr a d emar k s of Te k t r o n
ix, Inc . T ELE Q U I PMEN T
is α
registere d tr adema rk of
Te k t r on ix U .K . L imite d .
Pr i n te d
i n
U .S .A
. Specificatio n an dprice
cha n ge pr ivileges
are
rese r ved .
I NST RUMEN T S ER
IA L NUMBER S
E ach
instr u ment has α serial nu
m
b
er on α p a6el i n sert, tag,
or
sta mp ed on t he c h assis .
T he fi r st nu m b e r o r lette r
d esig
n ates th e co un try of
ma nu fact ur e . T he last five d igits
of t h e se r ial nu m be r a r e assig
n e d sequ e n tially an d a re
u n ique
to eac h i n st r ume
n
t .
Those m anufact ur ed in t h e
U
nite d States have six un i que d
igits
.
T h e coun try of
m an ufact
ur e is i d e n tifie d as
follows
:
ΒΟΟΟΟΟΟ

Te
k
t
r on ix, Inc ., B eaverto n , O r egon, USA
100000

Te
k
t
r onix Gue rn sey, L td ., C ha nn el Isla
n
ds
200000

Te k t r on ix U
nite d K i n g dom, L td ., L ondo
n
300000

So n y/Te k tronix, Japan
700000

Te
k t r o n ix H olla n d, NV,
H
eere
n veen ,
T heN et h e r la nds

TA
BLE
O
F CO N T EN TS
P age
SPE
CIF ICATIO N
O
PER ATI NG I NSTRU CTIO NS

1
CI R C U IT O PER ATIO N 1
M AI N T ENA N C E
CA L I BR ATIO N 2
APPL ICATIO NS
ELE CT R ICA L P A
RTS L IST
DIAG R A M SAND CI RC
U IT B OA RD I LLU STR ATIO NS
MEC HAN ICA
L PARTS L IST
7 Α
17

ADD OCT 1983

7 Α 17
I N
ST
RU CTIO N M A NU
A L
SPECIFICATION

i n stall, alig n t h e upp e r and lowe r r ails of t h e
7 Α
17 with
t he plug-in co
m pa r t m ent t r ack s an d fully inse r t it (t h e
Ge
n e r al

pl u g-i n p a n el
m
ust be fl
u s h with t he oscilloscope p anel) .
7 Α 17 is αu tility plug-in
d esig ned for u se w it h
To r e m ove, pull t he release latc h to disengage
t h e 7 Α 17
T h e
from t h e oscilloscope .
Te k t r
onix 7000-se r ies oscillosco p es . T h is plug-in pr
ovi d es
50-oh m, 50-
m illivolt/ d ivision access to eit he rt he ve r
tical

Controls
and Connectors
o r ho r izo n tal d eflection
syste m i n t he mainframe . It also
p rovi d es i n te r facing to t he mai
nf ra m e p owe r s upp lies,

P OSITIO N

P ositions the d is p lay .
rea d ou t en co d ing ci r cuits, an d oth
er f un ctions th at allow
cu stom circ u it d esig n to m eet specific
n eed s .
E lect r ical C h aracteristics
Deflection F
acto r :
50 mill ivolts/ d ivisio n
wit h Gain a dju ste d inter n ally .
Freq ue
ncy R
es po
n se ( M ainf r a m e depe nd ent) :
7400 - 50 mega h ertz ; 7500 - 75
mega
h ertz
; 7700 - 150
m ega h e r tz
; 7900 - greater t han 150 m ega
h ertz .
T h is plug-in h as
αb asic d eflectio n facto r of 50
I npu t Im pe d a nce :

mV /d iv w h en t he i n te rn al
Gai n co n trol is p rope r ly
a dju ste d . G
r eate r than 10 m V / d iv at reduced b a
ndwi d t h
50 o hm s p l u s o r
min u s
10% .

m ay b e ach ieve d by adju
sti ng t he Gain control . Ot her
d eflection facto r s may
be ac h ieve d b y u sing the sol der
pad s p r ovi ded in t h e plug-in, an
d cu stom- d esigni n g t h e
P OSITIO N
R
a
nge :

ci r cu it . Refer to t h e A pp licatio n s section for
s uggestions .
At least +10 d ivisions to at least -10
divisio n s fro m
gratic u le cen te
r .
T he 7 Α 17 is not factory eq ui
pp ed wit h r eadou t .
M axi mu m I n p u t V oltage :

H
owever, access is provided so t h at rea d ou t e n co
ding
5 volts RM S

r esisto r
s can b e connecte d . R efe r to t h e A pp lications
section for s u
ggestio n s .
En viro nmental C h a r acteristics
R efe r to the 7000-se
r ies oscilloscope mainfra m e
m a nu al .
OPER ATI N G
I N
ST
RU CTIO N S
I NPU T BN C co nn ecto
r p rovi d es α m ea n s
for conn ecting α sig n al .
Inp u t Coupling
T he 7 Α 17 I NPU
T is d i r ectly coup led i nto α 50-o h m
impe d ance . H oweve r , t h e i npu t may b
e d esig ned to
acce p t any
type of signal . R efer to t he
Applicatio n s
section fo r s uggestions
.
Deflection F actor
R ea dou t En cod i ng
P olarity
T he p olarity of t he
dis p laye d sig n al may be inverte d
by moving the st r ap s from
+
UP (as m ar
k e d on t h e
ci r c
u it board ) to t he solde r p a d s m a rk ed
I NV .
CI R C U IT O
PER ATIO N
7 Α 17
Ge n e r al

Th e sig n al a pp lie d to the I
NPU T con necto r is d irect
T he 7 Α 17 operates with any 7000-se
r ies oscillosco p e

cou p le d to pa r a ph ase am
p lifier
0110,
Q210 . P ositio n i ng
and is r ea dy for
u
se as
it is r eceive d . It can be installe d is achieved
b y varying th e DC level at the base of
in any co m pa r tment of t h e 7000-se
r
ies
oscilloscope . To

Q210 . Gain of the p ara ph
ase amp lifier (Q110, Q210) is

7
Α 17
set to a pp roxi m ately one by R 211 . P ola r ity of t h e

Special P arts . In a d d ition to t h e sta
n
dard
electro n ic
d
is p laye
d
sig nal may be inverte d b y movi n g t h e s h orting

com ponen ts, so m e s p ecial p arts a r e u sed in t h e 7 Α 17 .
stra p s to t h e I NV p ositio
n . T he
out pu
t
of
t h e p ara ph ase

T hese pa r ts a r e man u fact ur e d o r selected by Te k tronix,
amplifie r is co n necte dto common emitter d iffere n tial

I nc . i n accor d ance
wit h our specifications . T hese s p ecial
a mp lifie r Q125, 0225 and co m mon b ase d iffe r e n tial

pa rts are in d icate d in t hep arts list b
y an aste ris k
am p lifie r Q120, Q220 . T h ese a mp lifiers pr ovide tr igge r

pr eceding t hep ar t n u m b er . Or d er all s p ecial
p arts
output a
n
d
signal o utpu ts to the oscillosco p e m ai n fra m e

d irectly fr o m yo ur local Te k t r onix F iel dOffice or
via t he i n terface con
n ecto r s .

re p resentative .
M AI N T EN
A N C E
Or de r ing Pa r ts . Wh
en or d eri ng re p lace m en t p arts fr o m
Ge neral

Te k tr on ix, I nc ., incl ude t h e instr u mentTy p e, instr u ment
s p o r tion of
t h e manual contain s info rmation

Serial Numb er, αdesc r i ption of t he pa r t (if elect r ical,
This include
circuit number), and t he Te ktronix P art
co nce r ning preven tive
m ainte nan ce, corrective mai n -
Nu
mb er .
te
n a n ce,
and
tr oub les hooting t he 7 Α 17 . Fu rt
he r i nfo r ma-
tio
n
relati ng to gene
r al m ai n tena nce can be found i n t h e
7000-se r ies
i n str u ction ma n ual .

Solde r ing Tec hn i ques . Ca re s h o u l d b e ta k e n w h e n
sol d eri ng to p reve n t d a m age due to excess h eat . Α s m
all
wattage sol d er ing iron (15 to 50 watts) s h ould be used .
Clean i
ng

Apply h eat d irectly to t
h e j
unction to be
sol de re d . U se
To im pr ove r elia b ility and to avoi
d p ossi b le t h ermal

only eno ugh heat to form α goo d b on d . H eat sin k
a
n d elect r ical pr ob lems, it is reco mm ended t
hat th e

co mp o nen ts w h en n ecessa r y .
7 Α 17 be cleaned at pe r io d ic intervals, as well as
b efo re
cali b ration .

R ep ac k aging for S
h
ipme nt
L oose du st may b e re m ove d
wit h
α
soft clothor α
dry br ush . H ar d en e d d irt may be re
m oved wit h α
cotton-ti pped swa b or cloth , d am pened w it hα
m il d
d ete
r gentand water sol u tio n , t henca r ef u lly r inse d and
dr
ied .
Troubles h ooting
Seve r al t r oub les h ooting ai d s
for t he 7 Α 17 a r e given
on o n e fol d out p age locate d at t he rear of t he manual
.
Th
is page incl ud es : Sc he m atic d iag r a m s, s h owi ngim
p or-
tant voltages, co
mp o ne nt val u es, and circuit n u m be rs ;
b oard p
ict ur es s h owing ph ysical locatio ns of
t h e
co mp on e n ts ; an d semicon ductor basi
ng d iagra m s . F or
b est results, u se t hese ai d s in con jun ction wit
h t he
Ci r cuit
Operation a nd Cali b ratio n p rocedu re .
R efer to t he 7000-series mainf r
ame m an ual fo r
gen eral troub les h ooti n g info rm atio n . (i .e . se m ico nductor
care, colo r cod
i n g, etc .) .
If th
e
Te ktro
n
ix inst
rum ent
is to be s h i pped to α Te k tr on ix
Se r vice Center for service or repair, attach α tag s h owing :
ow ne r (wit h a dd r ess) a nd t he na m e of an i nd ivi d ual at yo ur
firm t h at can be contacted, comp lete instr u me nt serial
nu m b e r and α d escri p tio nof t he service requ ire d .
Save and r e- u se th e pac kage in w h ic h yo u r instr u ment was
s h i pped . If t he original pack aging is un fit fo r u se o r not
availa b le, re p ackage th e inst r u m ent as follows :
T he ca r ton test stre n gt h fo r yo ur i n st ru me n t is 200 po und s .
Gain
Su rro und t h e instr um ent with polyeth yle ne sh eeti ng to
protect t he finis hof t he instr u ment . O b tain α carto nof
cor ru gate dca rd boar d of the co rr ect ca r ton stre n gt h and
having insi d e d i m ensions of no less than six i nch es m o r e
t han t h
e instr u
ment d
imensio n s
. C
u s
hion t
h
e instrument
b y tig
h
tly p ac k i
ng
t
hree
i
nch
es of
dun
nage o
r ureth ane
foam between carto n an d i n str um e nt, on all si des . Seal
ca r ton with s h i pp i ng tape o r i ndu st r ial staple r .
CA L I BR ATIO N
Co rr ective M aintenance
Install t he 7 Α 17 in any 7000-se r ies oscillosco pe
m
ai
n -
Stan d ard R e p lace m ent
Pa r ts .
All
electrical a nd

f r ame . Apply α 1 kH z, 0 .4 volt s q uare-wave fro m t h e
m ech a n ical r eplacement parts fo r t h e 7 Α 17 can b e

oscillosco p
e CA L I BR ATO R . Ce n te r t hed isplay a nd
obtai ned t hr ough yo ur local fiel d office or represen-

a dj ust t
he
Gain
potentio m eter (locate d on th e circ u it
tative . H oweve r , m a ny of t he electronic p arts can be

b oa r d ) for α d is p lay of
eig h
t
divisio n s .
ob tai ned locally i n less ti m e t h a n is req u i re dto or d er
t h em fr om Te k tro n ix, Inc . Before purch asi ng or ordering

NOTE
re p lace m e n t p arts,
check t he pa r ts list for val u e, rating,

O b se r ve p r o per termination
of CAL I BR ATO R ou t put
tole r ance, a nd d escri p tio n .

w h en applying voltage to t h e 7A1750 Ω input .
REV . C, OCT . 1977

Α PPL I CA TIO N S
Gene r al

TA BLE 1
T his section p rovi d es s uggestion s for possi b le mo d i-

P O WER S UPPL Y L OAD
L I M ITS
fications to t h e 7 Α 17 .
Th e 7 Α
17 may
b e m o d ifie dto
s u it αpa r tic u lar n ee d b y u sing t he areas p rovi d edfor

S upp ly V olts

* M axim u m Limit
circuit con struction . P ower s upp ly a nd r ea dou t connec-
tions
are rea d ily availa b le ; see F ig . 2 for t h eir locations .

+5 V

500
mA
T he fro n t su b - p a n el of t h e 7 Α 17 is p r e- pu nchedwith
+15 V

500
mA
various size and
s h
a p
e h oles to
allow easy
m oun ti ng of

-15V

500 m A
switc h es, indicators, etc .

+50
V

100 mA
-50 V

100 m A
7 Α 17
P ower s u pply limitations are given in Ta b le 1 . Ι 2
ί 5 recom m en d e d t h at ci rc u it r y added to t
h
e 7 Α 17 not

*These maximums cannot occur simultaneously! T he total p ower
exceed these limitations .

d issipation must not excee d - 16 .5 watts .
GAI N AD J
F ig . 2 . 7 Α 17 s h owing areas for circuit construction and p re- p unched front sub-panel .

7 Α 17
H IG H IMPE DA N C E A MPL I F I ER

R 5

390 Ω

1/4
W

5%
R
6

910 92

1/4 W

5%
T h is fiel d effect t r an sisto r ( FE T) a mp lifier can
b
e

R7

21 Ω

1/8 W

1%
co
nn ecte d to the in pu t of t he 7 Α 17 to i ncrease th e

R 8

1 ΜΩ

1/4 W

10%
sta b ility and r aise t h e
i np
ut
i mp e dance f r om 50 o h ms to

R9

21 Ω

1/8 W

1%
over one mego h m depending on
t he value of R 1 . (It is

R
10

910 Ω

1/4 W

5%
not r eco mm en d e d t h at R 1 excee d five or ten mego
hm
s

R
11

390 Ω

1/4 W

5%
du e to p ote n tial lea k age pr ob le ms .)
T he op tional limite r ci r cuit, co
n sisti n g of C R 1 αand
C R i b, s hou l d be u sed w h en t h
ere
is
α
p ossibility of
exceeding ±15
volts at the i np ut of the FET a mp
lifie r .
T h is circ u it will avoi d p
ossi b le d amage to t h e FE T .
Atte
n uato r s m ay b e a dd e d to th is amplifier circ u it fo r
t he pu rpose
of ob taini n g αd esi r ed d eflection facto r , r efe r Q 1α- Q 1 b
to t h e a pp licatio nfor "atte
nu ators" .
P
a r ts
L ist :
* R 1

1 ΜΩ

1/4
W

1/2%
R 2

470 Κ 92

1/4
W

10%
R3

560 Ω

1/4 W

5%
R 4

47 2

1/4 W

10%
* M ay be selecte d to
suit in pu t imped ance re q uirements .

*'O p
tional
I
NPU T
R 1
1 Μ
-15 V

+15 V

+15 V
op tional
Ι

Ι
`~ D1A

D1 B

R 5
ει

L - t
Ι

QlA

ς 3 Τ
R 2

Ι

R4
Fig . 3 . FE T Amp lifier .
REV . FEB 1974
Ci

.005 μ F

ce r

20%

500 V
C2

1 .8 pF

ce r

20%

500 V
C3

22 μF elect

20%

15 V
C4

.001 μ
F

ce
r

20%

500
V
C5

22 μ F elect

20%

15 V
**D1 a -D1b

D u al d io d e F SA1480 availa b le
from Te k t r
on
ix,
Inc ., o rd e r pa r t
nu
m be
r
152-0321-00 .
Ν channel D u al
F ΕΤ 2Ν
4416
a v aila b le fro m Te k tro n ix, Inc .,
or d e r p a r t nu m b er 151-1031-00 .
R 7
C5
R6
910
To
7 Α 17 in put
R 10

ATT ENU ATO R S
( U se
wit h FE T Am p lifier)
In so m e cases w h ere the sensitivity of the 7 Α 17 is
too great, atte nuato r s of t h e ty pe s h own in F ig . 4 m ay
be a dd e d . T h ese are h ig h imped ance attenuators and
s hou l d be u se d with α h ig h i npu t i mp e d a nce am p lifier,
r efe r to t he FET A mp lifier in t h is sectio n .
C2 is αva
r
iable capacito
r u
sed to
n
o
rm alize
th e
Input to app roximately 10 pF
. F
or t
h
ese calculations,
C2 is ass u me d to b e 10 pF .
R Σ et - R2'
Ct =
13
2
,
C
2
Rt
I NPU T
ν ;
F ig . 4 . H ig h F re q uency Attenuators .
Exam p le : Α d eflection factor of 200 m V /
d iv with R i n = 1
m
ego hm is d esi
r
ed . T h e FET a mp lifier has an input
r esista n ce = 1 mego h m = R fet
50 m V / d iv
Vr
_
-Vo/V,

200

= 0.25
mV /D ίν
R 2' =
1
m
ego
hm
Χ 0 .25 = 250 k ilo h m
RI = 1 m ego hm -250 k ilo hm = 750 k ilo h m
R
2-
250 k ilo hm Χ 1 m ego hm
=
333 k ί1 ο h m
1 m ego h m -250 k ilo h m
F or mu las :
Attenuatio n

_ R atio V
r
=
V ο / V i

250 k ilo h m Χ 10 p icofarads
C1

750 k ilo hm
=
3 .3 p icofara d s
R fet
-- i np ut r esista n ce of t he amplifie r .
R i n = d esi r e d
i npu
t
resistance at t h e I NPU T connector .
N or m alizing

Con nect α 1 kH z squa r e wave
R 2' = R i n Χ V
r
R 2 p arallele d with R f
et

fro m

t h e

oscilloscope CA L I-
BR ATO R . A d ju st t he outpu t of
Rt - R in - R 2'

t h e CA L I BR ATO R for αd is p lay
of four to six ve r tical d ivisio ns .
R

Ad ju st C2 for s quare lea d ing edge
2 = R
2'
R Σ
et

a nd flat top .
Gain

R eadju st, if necessary, t h e 7 Α 17
Gain co n trol fo r pr ope r sensi-
tivity .
To FE T
Am p lifier
7 Α 17

7 Α 17
RE ADO U T

Each
word locatio
n h
as its own r ow and col um n
return lines . The top word locations have α row return
E
achof t he oscillosco p es fou r p l u g-i n com pa r tments

line locate datΒ 37 of t h e p l u g-in inte r face connecto r
are allotte d two wo rd locatio ns located at
t
h e
to p and

and α col umn r eturn li ne located at Α 37 . Th e botto m
b otto m of th e C R T sc r een (see F ig . 5) . E ach wo rd
word locatio n s have αr ow ret u rn line at Β38 a nd α
locatio n can b e enco d e dto write
up to te nch ar acte rs .

colu mn ret u rn li n e at Α 38 .
For each
of the ten
s paces available
in α word location
t her e is α
co rr es p on d i ng ti m eslot (TS) pu lse . T he time-
slot pu lses inter r ogate t h e readou t e ncoding r esisto rs in

T h e ti m eslot pu lses are always -15 volts in ampli-
t he pl u g-i n s . T her es u lting info rmation is ret urnedto t he

tu de . T h erefore t h e cu rre n t flowing fr
o
m
t h e ti m eslot
oscillosco p e read out system as vario u s row
an
d col
u
m n
lines t hr o ugh t he p l u g-i nencoding
resistors into t h e row
cu rre n
ts .
T h
ese
r
ow a nd col umn cu rr en ts select t he

a nd column ret urn lines is α d irect resu lt of t he value
ch
aracte rs or ope r atio n sfr o m t he m at r ix s h own i n F ig .

of t h e en co d ing resisto rs as give n by O hm 's law . For
7 . Fo r exa mp le : to ob tai n t he letter " Α " t he r e mu st b e

exa mp le : In o r de r to p lace th e letter " Α " at timeslot
0 .4 mA of row cu rrent a nd 0 .3 mA of col umn c urr e n t .

location 3 of t he top word locatio n (ci r cle d in F ig . 5),
α 37 .4 k ilo h m r esisto r
(-15 volts/0 .4 m A) m u st b e
Plug-in

Plug-in

Plug-in

Plug -in

place d b etween
TS-3 a nd t h e row ret ur n li ne Β 37 andα
Compartment

Com partment Com p artment Cornp a rtment

50 k ilo h m

resisto r
Ι

(-15 volts/0 .3 m A) b etween Τ 5-3
#1

#2

#3

#4

and col u m n ret urn line Α 37 . R efer
to Ta
b le 2 for interface
pin
con nections
.
TS-5
Τ 5-3 Τ 5-7
TS-1 I Ι I Τ 5-9
9000
-TS-1
- TS-2
- Τ $-3
-TS-4
- TS-5
-TS-6
-TS-7
-TS-8
-TS-9
-TS-10
Bottom

To assure t hat encoding
errors
cannot occur
w hen the
W ord Locations

Ι

enco d ing load is heavy, α d io de should be p lace d in series
with t h ose encoding resisto r s t hat allow 0
.6
m A o r m o r e
c u rrent to flow into t he row o r col u mn ret u r n li nes .
T h is m eans t h at w hen calc u lati ng t he values for the
enco d i ng resistors t he forwar d voltage drop ( V f) of the
TS-1
' TS-2
. τε .

Ι

d io de m u st be ta keninto acco un t ; i .e .,
to ob
tai n 0
.9
MA
using α silicon
d iode, t he typ ical value of t he
en co d i
ng
resistor wo
u
l d b
e
-15 volts V f/0 .9 mA = 15
F ig . 5 . R ea dout W or d L ocations an d Timeslot L ocations .

volts-0 .6 volts/0 .9 mAχ 16 .2 k ί lo h ms .
Timeslot Nu m be r
C RTSCREEN
I n terface
Pin
Nu m ber
Β 33 -
Α 33 -~
Β 32 -~
Α 32 -~
Β 31 -~
Α 31
Β 30 --~
Α
30 -~
Β 29 -
Α 29 -
TA BLE 2
E ncoding
R esistors
T he d iag r am for th e ab ove exam p le is s h own in F ig . 6 .
37 .4 k
To Β
(row return rn line)
from Β32

50k
ITS-3)

To
Α 37
(column return line)
F ig . 6 . E ncod ing configuration for letter " Α " .
for
R owR et u rn L ine 837

top
Column Return Line Α 37 word
locations
for
RowR eturn Line Β 38

b ottom
Colu
m n R
etu
rn L i n e Α
38 wo
rd
locations

Ι
Colu m n
0 1 234567 8 9
10
Ι

0 .2

Ι

0 .3

Ι

0 .4

Ι

0 .5

Ι

0 .6

Ι

0 .7

Ι

0 .8

Ι

0 9

31 .
ROwam er es

0

Ι
0 .1

0
C u rre η ί
ι ( M illi-
ρ ιΙ
1 0

0 1 2 3
4 5 6 7 8 9
2 0 .1

ί <Ι
/ + -
+
CΔ>
3 0 .2

A dd * Add * R e d uce * R
educe *

ID EN TIF Y *
one two prefix p
refix
zero

zeros

an d
add
one zero
4 0 .3

m μ π

Χ Κ Μ GΤ β
5 0 .4 SKIP - S V
Α
IN
Ν d 8 C Ω
Ε
6 0 .5

U Ν
L Ζ Υ Ρ F J QD
7 0 .6

Decimal* Decimal* Decimal * Decimal * Deci
m
al
*
p oi n t p oi n t p oi nt p oint point
location location location
location location
#3 #4 #5 #6 #7
8 0 .7
9 0
.8
10 0 .9 A dd
S
p
ace
In
Dis p lay *
Op eratio
n
al ad
dr ess
F ig . 7 . Read out
M atrix .
T h e following table in d icates the typical
r
esisto
r

sp ace) . T he following fig u re sh ows αp ossi b le timeslot
val u es r equ i re d to enco d e s p ecific currents . R esistors

assig nm e n t .
may be rated as low
as
1/8
watt .
Ti m eslot

111 2131
4
15161
7
1819110
R equ i re d

R esisto r Tole r an ce

C h aracter

Τ I Ε 1 S 1 Τ ls p acel 1
C u rre nt V alue
0 .1 m A

150 k Ω

5% ο

Timeslots 1, 2, 9 an d 10 do n ot r equ ire e ncod i n g r esisto rs .
0 .2 mA

75 1< Ω

5%

Ty p ical

resisto r values for en
codi
n g
are give n in t he
0 .3
m
A

50
k Ω

5%

followi n g ch art .
0 .4 mA

37
.4
k Ω

1%
0 .5 mA

30 .1 k S2

1%

T h e circuit for "TEST 1" is s h ow
n in F ig .
8 .
0 .6 m A

24 .3 1< 2 1%
*0 .7 m A

20 .5 k Ω

1%

Timeslot

Ch aracter

Row

Col
um n
*0 .8 mA

18 .2 1< Ω

1%

L ocatio n

E nco d ing

En co d ing
* 0 .9 m A

16 .2 k Ω

1% ο

R esisto r

R esisto r
*31 .0 mA

12 k S2

5% ο
3

Τ

50 k Ω

16 .2 k Ω
* U sing α

1N4152 silicon d io de

4

Ε

37 .4 k
Ω

12 k S2
5

S

37 .4 k Ω

150 k 2
6

Τ

50 1<12

16 .2 k 2
Exa mp le :

"T E ST

1"
is
to b e written on
t he C RT

7

S P AC E 16 .2 1< Ω

-
scree n . T h is word is six ch ar acte rs lo ng
(incl ud ing α

8

1

-

75 k Ω
7 Α 17

7A17
ITS-31
Β32
( Τ 5-4)
Α 32
ITS-511
831
50k
ΛΜι
16 .2 k
AA/'V
37 .4 k
37 .4 k
150 k
Deci m als e n code d dur ing ti m eslot 1 appear b etwee n
timeslot locations therefore d o not requ i re the use of
anot her timeslot location . Exam p le : E nco d ing "D ECI-
M A L POINT L OCATIO N#4" dur i ng timeslot 1 wo u l d
16 .2 κ

cause αd
eci m
al to a ppea
r b etween ti m eslot 4 and ti m e-
slot 5 .
Β 37
16 .2 kI
row return
^"

line)

En co d i ng t he "ID EN TI F Y" op eration d ur ing ti m eslot
75k
1 will cau se t h e entire rea do u t to ch ange to the wor d
ο ~ η
^ η

Α 37
(column
IDENTIFY .
return line)
F or furt he r i n formatio n concer n ing t h e rea d
outrefe r
2
ο t he man
ual of any 7000 se r ies m ai nf ra m e t h at
F ig . 8, Encod ing information for "TE ST
1" .

con tains α readout .
(TS-6)
Α 31
ITS-71
Β 30
(TS-8)
Α 30
50 k
B A ND W IDTH
L I M IT ER
For low frequen
cy
app
lications, h ig h fre q uency n oise
p ro b lems can b e re d uced b y r est r icting t
heb
a
nd wi d t h
of t he 7 Α 17 . F or example, w h en d is p layi ngαlow-
frequency sig nal, li m iting t he h ig h fr eque n cy r es ponse i n
ma ny cases will consi
d era b ly red uce h ig hf r e qu e ncy
noise wit hou t d isto r ting t he d
esire
d signal .
T
h
e
filte
r
sh own in F ig . 9 is
to be
connecte d in series
with t h e Signal outpu t li n es (A-11 and B-11 on the
con nector) . Small notc
h es
on
t h e conductive "run s"
lea d
i n g
to
Α -11 andΒ -11 are p rovide d as p ai n ts w he r e
t he Signal out pu t li n es may
be cu t
to
i n sert t h e filter .
T
h
e r eadou t matrix (
F ig . 7)
contains bothcharacter s
and op eratio n s . T h e op eratio n s are mar kedwithan
aste r is k (") arid a r e always encod e d dur i ng ti m eslot 1 .
Enco d i ng t hese op eratio
ns causes p
re-deter
m
i ned c h arac-
te rs o r d eci m als to appea rin o r b etwee np re- d ete rm i n e d
ti m eslot locatio n s . F o r exa mp le : enco d ing "ADD T W O
Z ER OS" du ri n g ti m eslot 1 will cau se zeros to b e
d is played in ti m eslot locatio ns 5 a nd 6 ; b y en co d ing
"RE
DU C
E PREF IX"
du
r ing
ti
m
eslot 1, th e pr efix t
h
at
was p revio u sly en co ded for timeslot 7 will be c hanged ;
(i .e .,
milli
(m) to
m
ic r o ( μ )) .
50

L

2 π _

F c L
L

π F c

C

πF , Χ 200

R_0
.5
E
XA MPLE :

Wh en

Fc e q uals 5 mega h ertz . L= 3.20 pH,
C = 320 pF, and R = 200 o hm s .
Το collector

ι
Q220

4 9

Το Α 11
εε
To
collector
Th is

filter

m ay

be

d esigne d using

t h e

following

Q120

To 811
fo rmu la w he r e

F c is t h e -3 dB fre q ue
n
cy in
H e r tz

ι
(w hen wo rk i ng into an i mp e d ance of 50 o hm s each si de
to gr ound ) . L is given in H enrys ; C is given i n F ara d s ;
a nd R is
give nin O h ms .

Fig . 9 . Bandwid t h L imiter .