Tektronix 2901 User manual

1 Ν E5 - Γ RU CT101 V
ΜΑΝ
UA
L
2901
Serial
Nu mber
TIME-MARK
G ENE R A TO R
Te k t r onix, Inc .

"
Ρ . Ο . Box 500
"
B eave r ton, Oregon 97005
"
Phone [phone] " Cables : Te k tronix
070-0995-00

370

WARRANTY
All
Tektronix
instruments
are warranted
against
defective materials
and workman-
ship
for one year . Tektronix
transformers,
manufactured in our
plant, are warranted
for the
life of the
instrument .
Any questions with
respect to the
war-
ranty
mentioned above
should be taken
up
with your Tektronix
Field Engineer .
Tektronix repair and
replacement-part
service is geared directly
to the field, there-
fore all 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
service . Please
include the
instrument Type and
Serial or
Model Num-
ber with
all requests for parts
or service .
Specifications
and -price
change privi-
leges reserved .
Copyrights
1970 by Tektronix,
Inc .,
Beaverton, Oregon .
Printed in the
United
States of America
. All rights
reserved .
Contents of this
publication may
not be
reproduced in
any form without
permission
of the copyright
owner .

P age

Page
SE CTIO N 1 S PE CI F ICATIO N

Test E qu i p ment R eq u i r ed and R ecommen d
ed 5-1
Introdu
ctio
n
1-1

S h ort For m Pr oce d ur e

5-2
P erformance Conditions

1-2

Calib r atio n R ecor d a nd In
d ex

5-2
E lect r ical C ha r acteristics

1-2

P
erfo r mance C heck /Cali br atio n P roce d ur e

5-3
E nviro n mental C h aracteristics

1-2

P
reliminary P roced u re

5-3
Ph ysical
C h aracte
r
istics

1-2

Test E qu ipment
Setup a
n
d Co n trol Settings 5-4
SE CTIO N 2
O
PER ATI
N G
I
N ST RU CTIO N S

C h ec k
Ove
n Lig h
t

5-3
Ch ec k /A d ju st -30 V S upp ly

5-4
I n tr od
u ctio n 2-1
C h ec k P ower S u p p ly R eg u lation

5-4
Installation

2-1

C
hec k /A d ju st Crystal Oscillator
F re qu ency 5-5
Co n trols an d Connectors

2-2

C hec k /A d ju st
Mu
ltiplie rs
(50 n s, 10 π s, 5 ns
General O p erating Information

2-2

and 2 ns)

5-8
C h ec k M arke r O u t pu t (Co unt d own
S E CTIO N 3 CI R
C U
IT D E
SC
R I
P TIO N

Circ u its)

5-10
I n tro d u ctio n
3-1

C hec k M a rk e r Am p lifier
O u t p ut

5-12
B loc k Diagram Desc r i p tio n
3-1

C heck Trigger
O u
t p
ut

5-12
Detaile d Circ u it Descri p tion

3-1

C hec k E xternal Cloc k O p eratio n 5-13
Oscillator

3-1
Mu lti p lier

3-1

SE
CTIO N
6
ELE CT R ICA L P A R TS L IST
Divider an d Co u ntdown Circ u its

3-3

Abbreviations a n d Sym b ols
P ower Su pp ly

3-9

P arts Ordering Information
In d ex of E
lect
r
ical P a rts L ist
SE CTIO
N 4 M AI N T EN A N C E

E lectrical
P a r ts List
Introdu ction

4-1
Access to t h e I n te r ior

4-1

SE CTIO
N 7 DIAG R A M S A N D MEC H A N ICA L
Pr eve n
tive M ai n te n a nce

4-1

P A RTS I LLU ST R ATIO N S
O
F
Cleani n g

4-1
E lectrical
Lu bricatio n
4-1
M ech anical
I n s p ection

4-1
R e p ac k aging
P erformance
C
h
eck
s

4-1
Tro
u
bles
h ooting

4-2

SE CTIO N 8 MEC H A N ICA L P A R TS L IST
Cor r ective M aintena n ce

4-5

M ech a n ical P arts L ists Information
Sol d eri ng Tec hn i qu e

4-5

In d ex of
M
echanical P
a r ts an d Repackaging
Ill u strations
R emovala nd R ep lacement of
Com p onents
an d Subassemblies

4-6

M ech
anical P arts L ist
Ph ysical L ocatio n of
Com
p
onents

4-9

Accessories
SE CTIO N 5 PERF O RM A N C E C HE C K /
CA
L I B
RATIO N
I n tr
od u ctio n 5-1
Com p lete or P artial Calibration P roce dure

5-1
Com p lete or P artial P erforma n
ce C h ec k 5-1
TABLE O F CONTENTS
2901
A b breviatio n s a n d symbols used in
this man u al are
b ase d on o r ta k end
ir ectly from IEEE Stan d ar d 260
"Stan d ard
Symbols fo r Un its", MIL-STD-12B and ot her
stan d
ards of t h e electro nics in d ust r y . C h a n ge
informa-
tion, if any, is locate d at t h e r ea r of t h is man
u al .

Fig . 1-1 . 2901 Time-Mark Generator .

Intro
du
ction
S E CTIO N 1
S PE CI F ICATIO N S
C h ange information, if any, affecti n g t h
is section will be fo u n d at t h e
rear of t h e man u al .
T h e 2901 Time- M ar k Gene r ato r is αcom p act, wide range,

T he inst ru ment is pr ovi ded wit h
an
attac h e d t h ree-wire
soli d state inst ru ment t h at p rovi d es acc ur ate time and fr e-

p
ower cor d wit h α thr ee-termihal p ola r ize d p l u g to connect
qu e
n
cy ma rk e
r
s fo r cali br ati n g a n d verifyi n g both t h e swee p
to t h ep ower so u rce . T h e t h i r d wi re, d i r ectly connecte d to
time acc u racy of oscillosco p es a n d t he fre qu ency dis p ersio n

t h e instr u me n t f r ame, is i n te nd
e
d to g r o
u
nd
t
h
e
i nst ru me n t
of s p ect ru m analyzers . M ar k e rfr e qu e n cies a r e cont r olle d by

to p rotect op erati n gpe r so nn el, as r ecomme n d ed
by
natio n al
αtem p erat u re-stabilize d 10 MHz c r ystal

oscillato r .

M a rk er

an d international safety codes .
ou t p u t selections incl u de fou r sine-wave f r eq u e n cies (20 MHz,
100 MHz, 20O MHz, 50O MHz) an d sixteen ma rk e r intervals

The instr u ment s h o
u
l
d be o p
erate
d from αp ower so ur ce
( .1 Its to 5s) in 1-5-10 seq u ence . Α ma rk e r am p lifie r o u t put

wit h its ne u tral at o r
near
g r o
u
n
d (ea
r t h ) p
otential
.
It is
p rovides eit h er p ositive or negative-goi n g h ig h level mar k ers

not inte n ded for ope r atio nf r
om two p h ases of α mu ltip h ase
(1
Its
to
5 s)
wit h minim u m am p lit u
de of 25 V
into 1 k Ω .

E ig h t

system, or ac
r
oss the legs of α single- p h ase t h ree wire system .
,_
I _
ι Μ
-,_~_,_~_ α
σσ
α
σσσσσσσσ
σσο σσ σ
ρ
10 .3 i n c h es
F ig . 1-2 . 2901 d imensions .
t r igger i n te r vals ( .1 Its to 1 s) are also p rovi ded in 1-10 se-
quence time coi n cide n t wit h t h e ma rk e r s .
Dime n sio n s
are to t h e n earest 1/8 i n c h
Ι "

10 .9 inches
2901
3
i
nc
h
es
j

S p ecifications-2901
P erformance Conditions
C h aracte r istics desc r ibe d i n t h is section a r e valid over
t h
e
state d envi r o n mental r a n ge, fo r inst ru me n ts calibrated
at an ambie n t tem pe r at ur e betwee n +20°C an d +30°C .
Th e crystal oven
i
n
d
icato
r
on
t h e inst ru me n t m u st s h ow t h at
normal op e r
ating
tem
pe r at ur e has been attai n ed ( p ower
applie d for 2 h o u rs o
r more) . T h e i nst ru ment also r e qu i r es
at least α 30' min u te wa r m up pe
r
io d afte
rt h
e PO WER
switc h
is switc h ed on .
Time- M ark ers
Pe r io d s
Acc u racy
Stability
Am p lit ude
M A RKER O U
Tpu t
2 ns (sine wave)
5n s to 50 ns (sine
wave)
.1 μ s to 5 s (mar k ers)
M A RKER A MPL I F I ER
O
U T PU T
T R IGG ER O UT p u t ( .1 μ s to
1 s i n decade ste p s) .
Am p lit ude
ELE CT
R
ICA
L
C
HA R ACT ER
ISTICS
C h aracteristic
E XTe rn al C L OC
K
INPU
T
Req u ire d
Am p lit u
de
'Parts p
er million .
Performa nce L imits
0° C to 50 0C) .
W it h in 3 Ρ/ Μ in 24 ho u rs
(20°C to 30°C) at .1 μ s (10
MHz) after 2 h o u rs o p eratio n .
At least 0 .3 V peak to p ea k
into
50 Ω .
At least 0 .5 V p ea k
to

p ea k
i n to 50Q .
At least 0 .5 V p ea k to pea k
into 50 Ω .
Am p lifie d 5 s to 1 μ s p ositive
o r n egative-goi ng time mar k -
e r s . Am p lit u d e (5s to 5μ s
ma rk e r s) at least 25 V into 1 k Ω
loa d . A mp lit u de 1 μ s ma rk e r
at least 22 V i n to 1 k Ω loa d .
Positive-goi n g triggers at least
0 .5 V into 50 Ω o r 1 V into 1
ΜΩ , 150 pF .
At least 2 V pea k to p eak sine

Dimensio
n s
wave

o
r

at

least

2 V

p ea k
p u lse am p
lit u
de
.
C h aracte r istic
Maxim u m Safe In pu t
Am p lit
u de
F re q u ency Range
In p u t Imp edance
Sin u soi d al-2 n s,

5 n s,

10 ns,

Line Voltage
50 n s .

115V R ange
Pe r io
d ic
Pu lses- .1 Its to 5 s in

230 V R ange
1-5-10 se qu ence
.

C
r est F actor ( R atio :
Perio d wit
h
i n 0 .001
% (10 Ρ/
Μ 1,

Pea k /
RM S)
20 ° C to 30 ° C) .

L ine C u rrent
Perio d with in 0 .002% (20 Ρ / Μ '
Power
L ine Fre qu ency Ran ge
Fu se (115V and 230V
R anges)
Tem pe r at u re
O pe r ati n g
Non-operating
Altit u
de
O p
erating
Non-operating
F i n is h
W eig h t (net)
Pe r formance Limits
5 V (DC + p ea k AC)
50
kH z

o r

less

to

10 MHz .
L owe
r f r e qu e n
cies
may be used
if t h e p u lse r ate of
r
ise is e qu
al
to or faster t h an 1 V/ μ s .
50 Ω wit h i n 20% .
In p
u
t P owe r Requ irements
90
V to
136
V .
1 8 0
V
to
272 V .
At least 1 .3
240 mA maxim u m
30 watts
maxim u m, at 115 V,
60 Hz .
48 Hz to
440
Hz
0 .3 Α F ast-blow ty pe .
E
nvironmental C h aracteristics
Ph ysical
0°C to 50 ° C Ambient
-40 0 C to 65 0 C
To 15,000 feet
To 50,000
feet
Fr ont panel is a
n odized alu-
minum
A pp r oximately 8 l b s .
A pp
roximately 11 inc h es Χ
8 inc
h es Χ
4'/3
inc hes . See
F ig .
1-2

Intro d uction
Th e 2901 Time- M ar k Gene
r ator p r ovi d es acc u rate time-
ma rk ers f r om 5 s to .1 1 . ιs
intervals a n d sine wave fre q u encies
from 50 n s (20 MH z) to 2 ns (500 MHz) .
M a rk er i n tervals or
f r eq u e n cies may be selecte d by dep r essing
α se r ies of self
canceli ng p ush b u ttons . Time-mar k ers may be
stac k e d (not
u sef u l for sine-waves) by p ush ing t h e d esi r ed mar k
e r
b
u ttons
sim u lta n eo u sly .
SECTION
2
O PER ATI N G I N ST RU CTIO
N S
C h ange information, if any,
affecting t h is section will be fo u n d at
t h e
rear of t h e man u al .
ΝΟΤΕ
2901
T h e crystal oven i
nd icator lig h t is across t he h eater
win d ing for t
h
e
crystal oven . It mo n ito r s t he o p er-
ation of t he t h ermostat, and i
n
dicates
w h en t h e
h eater is on . The crystal oven
p
ower
is in d ep en d -
ent of t he P O WER switc h .
T r igger pu lses, from .1 Its to 1 s, coinci d ent wit h t h e co r -

FUN CTIO N O
F
CONTROLS
res pond ing time-mar k ers,
are available at t he T R IGG ER

A N D CONNECTORS
O U Tp u t connector w hen any of
t h e eig h t T R IGG ER S E -
LE CTO Rpu s hb u ttons are d e pr essed .

All selectors and connectors re qu i r e d
for normal op era-
H ig h am p lit u de (25V pea k to p eak , or g r eate r ,i
n
to
1 k Ω )

tio n
of t he 2901 a r e locate d on t h e front a n drear p
anels
mar k ers, p ositive-going or negative-going p ola r ity, f r om

of t h einstr u
ment ( F ig . 2-1) . T h eir f un ctions a r e described
1
Its to 5s
are available at t h e M A RKER AMPL I F I ER O U T-

i n t he following
table .
PU
T
conn
ecto r w h en t h e M A RKER A MPL I F I ER switc h is in
eit h e r t h e
-h
o r - p
ositions
.
M A RKER AMPL I F I ER switc h
s h o u ld be in t h e O FF p
osition w hen t h e am p lifier is not u se d .

M
A RKER
S
ELE
CTO
R

Self-canceling

p ush b u ttons,

t h at
select in d ivi d u al o r combinations
of time-mar k er
intervals and fre
q u encies, for t he M
A RKER OU T pu t
Installation

connector . M ar k ers up to
two
deca d es ap art may be stac k e d by
T h e 2901 instr u ment is p rovi ded wit h an
attac h ed th ree-

de p ressing t h e d esi r ed p u s hbu tto n s
wire powe
r cord with α t h ree-termi n al p
olarize d p l u g for

sim u ltaneo u sly (not a pp licable fo r
connectio n to
t h e p ower so u rce . T h e t h i r d wi r e is
d irectly

th e sine-wave fre qu encies) .
connecte d to
t he inst ru ment frame a n d is i n te n ded to gro un d
t h e i n str u me n t to p
rotect op erati ng pe r sonn el, as recom-

MA
RKER O U
Tp
u
t

O u t p u t for sine waveo r ma rk e r
men d e d by t h e n
ational an d inte r natio n al safety cod es .

per ί od s
SELECTORS .
selecte d by t h e M A RK-
Color co d ing of cord condu
ctors follows t h e N ational E lec-

ER S ELE TO R S . O u t p u t am p lit u de
trical

Code :

L
ine

cond u ctor-blac k ,

ne u t r al

cond u cto r -

of th e mar k ers, at least 0 .5
V p ea k
to
w
h ite, safety eart h (gro u n d ing) cond u ctor-green
.

p ea k into 50 Ω loa d .
T R IGG ER S ELE CTO R

Series of eig h t self-canceli
n g p u s h-
b u ttons t h at select o u
t pu t trigger
O p e r ate t h e 2901 f r om α p ower so u rce wit h its ne u tral

p u lses from .1 Its to 1 s in decade
at o r nea r ground (eart h ) p ote n tial . It is not i
n ten
ded
fo r
ste p s . Trigger pu lses a r e coi n ci-
op e r atio n f r om two ph ases
of α m u lti- ph ase system, or

dent wit h t h e corres po n d ing time-
across t h e legs
of α si n gle p h ase, t h ree-wire system . L ine

mar
k ers .
voltage r an ge, fo r t he 115V selector p osition, is 90V to

M A RKER A MPL I F I ER

Th ree p ositio
n
switc
h (-}- O FF -)
136 V

( n ot to excee d 177 V) ;

an d 180 V to 272 V ( n ot to

t h at

p rovi d es

am
p lifie d

p ositive
excee d 352 V) for t h e 230 V range of
t he line voltage se-

or

negative-goi
n g

time-ma rk e r s
lecto r p
ositions .

L ine fre qu ency ra nge is 48 Hz to 440 H z .

at

t he

O U T PU T

con n ecto
r .

Se-
iecte d mar k ers from 1 Its to 5 s
a r e
amplified
t h e ap p ro p riate line
voltage range for yo ur sit u -

m p lifie d to at

least 25 V

p
ea k
into 1 k Ω . Does n ot o p erate over
ation by switc h ing t h e screw d r ive r
o pe r ated L ine V oltage

t h e 2 ns to .5 Its

r a n ge .

Switc
h
selector
on t h e bac k panel (see F ig . 2-1) to t h e correct p
osi-

s h o u l d be i n t he O FF p osition
tio n , and p l ug
t h
ep
ower co r d i n to αs u itable p owe r so ur ce .

w h en t he am p lifie r is n ot u se d .
Allow two ho ur s fo r
th e
c
r ystal oven temperat u re to sta-
bilize (to mi n im u m d r ift), t h en t ur n t he P O
WER switc h to

O U T PU T

O u
t p
u
t
co
nn ector fo r t h e am p lified
ON an d allow 5 minutes fo r t h e i n str u ment to
warm up .

time-mar kers .
O u t p u t am p lit u de

O p erating
Instructions 2901
Ζ - Ζ
Fig . 2-1 . F ront and rea r- p an el selecto r s an d connectors .

O p erating Instructions- 2901
of

t
h
e

mar k ers

is

at

least 25 V

or less .

F re qu en
cies below 50 kH
z
pea k , i n to α 1 k Ω loa d .

may b e used if t h e rate of rise
O VEN Indicator

Indicates crystal oven h eati n g .

is 1 V / μ s . The 0 .1 μ s M A RKER
Crystal oven and in d icator p ower

SELE CTO R pu s hbu tto n is t h e Χ 1
a r e in d
ep endent of t h e P O WER

in pu t signal p e r iod, with t h e lower
switc
h .
Allow
approximately 2

order selector bu ttons co u nting
h o ur s, after
t h
e p
ower cor d h as

t h e in p u t p eriod d own in 1-5-10
been connected to αp ower so u rce,

seq u ence
to
t h e lo n gest
(5 s
pu s h-
for

th e

crystal

tem p erat u re

to

b utto n
) pe r
iod .
2 n s
to 50 π s sine-
stabilize . T h e i n str u ment can be

wave ma rk
er selections are in-
u se d wit h i n 5 min u tes after t h e

o p erative
with
an exte rn al sig n al,
P OWER switc hhas been tu rne d

u nless t h e in pu t fre q u e n cy is 10
on ; h owever, freq u ency stability

MHz .
will be r e d u ce d .

L I NE V O L TAG E Selecto r Sc r ewd r ive r o pe r ated switc h t h at
C L OC K ( ΙΝΤ - ΕΧΤ ) Switc h Selects eit h e
rt h
e
i n te r nal oscillator

selects tn r 90 V p r ima r y

0
V
-
-
(Rear P anel)

or an

exte rn al

signal as t h e f r e-

272 f
V
o r
ea
nominal
li
n e
-1
voltage
V or 180

-
q u e
n
cy
so u rce for t h e coun tdow n
2ltage op e r a-
tion .
circ u its .
ΕΧΤ C L OC K I NPU T

U se d for external oscillato r
sig nal
.
Connecto r Input imped ance a pp roximately
50Q . E xternal cloc k fre qu ency is

General O p erating Information
co u nte d down in α 1-5-10 se-
quence, to 50 χ10 6 times t h e in-

T h e crystal ove n temperat u re has stabilized w h en t he
pu
t p eriod . F req u ency range 50

O VEN i n dicato r cycles on a n d off at regu lar intervals .
kH
z
o r less
to at least 10 MHz .

Pe r iod of t h e cycle is abo u t 30 seco n ds, de p ending on t h e
R eq u i
r
ed
signal in p u t am p lit u de is

ambie n t tem pe r at ur e .
1 volt mi n im u m p ea k to p ea k
sine
wave to 5 V (pea k AC

+

DC)

Te r minate t h e ou
t p
u
t into
50
Ω for o p tim u m ma rk e r d ef-
maxim u m .

R
eset

level

+50 m V
inition and consistent
mar k er amplit u de .