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Tektronix 2901 User manual

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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
644-0161
"
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
.