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I
N
T
R
OD
U
CTIO
N
O
p
tio
n
5Α incl
ud
es t
h
e ci
r
c
u
it
r
y
n
ecessary to e
n
a
b
le t
h
e
i
n
str
u
me
n
t 2ο
b
e dri
v
en
b
y an exte
rn
al refe
r
e
n
ce frequency,
and also
p
rovi
d
es an i
n
te
rn
al refe
r
e
n
ce f
r
o
m
α tem
p
e
r
at
ur
e-
co
m
pe
n
sate
d
crystal oscillato
r
( Τ C ΧΟ ) . T
h
e acc
ur
acy of
t
h
e instr
um
e
n
t may
b
e improved
b
y usi
n
g eit
h
er the
i
n
te
rn
al o
r
external reference . In
a
dd
ition, t
h
e internal
TCXO may
b
e use
d
as α
r
efere
n
ce for ot
h
er i
n
str
um
ents,
T
h
e ci
r
c
u
itry fo
r Op
tio
n
5 Α i
n
cl
ud
es t
h
e Μ 153 Internal/
E
xte
m
al Refe
r
e
n
ce
m
o
du
le and two RF ca
b
le assem
b
lies .
To install O
p
tio
n
5 Α , remove the i
n
str
u
me
n
t top a
nd
botto
m
covers (refe
r
to instruction ma
nu
al Sectio
n
5 .2)
and p
l
u
g mo
du
le Μ 153 into t
h
e o
p
en mo
du
le soc
k
et next
to t
h
e Μ 30-1/4 Crystal Reference mo
du
le . Install the
mo
du
le
h
ol
d
-
d
ow
n
sc
r
ew
u
nd
er
n
eat
h
the
i
n
st
rum
e
n
t
c
h
assis. Co
nn
ect t
h
e
RF
cable asse
mb
lies
as ; shown in
F
igu re 8/5Α-1 .
OPER
ATIO
N
OPTION 5A
I
N
T
ERN
A
L
/
E
XT
ERN
A
L REFEREN
C
E
Wh
e
n
t
h
e Ιπ t/
E
xt s
w
itc
h
an to
p
of mo
d
ule Μ 153 is i
n
t
h
e
"Int" position, t
h
e i
n
str
u
me
n
t is phase loc
k
e
d
2ο
t
h
e
TCXO in t
h
e Μ 153
a
nd
t
h
e i
n
st
rum
e
n
t acc
ur
acy is !1
ppm
( .0001%) . T
h
e TCXO signal is also o
u
t
pu
t at t
h
e rear-panel
co
n
nector for
u
se i
n dr
iving ot
h
er
d
evices .
W
h
en t
h
e Μ 153 switc
h
is
in
t
h
e " Εχτ "
p
osition, t
h
e
i
n
str
um
e
n
t is
p
h
ase loc
k
e
d
to t
h
e exte
m
al so
ur
ce . If no
external so
ur
ce is p
r
esent . O
p
tio
n
5A is non-functional,
and
t
h
e i
n
st
rum
e
n
t accuracy is ret
urn
e
d
to t
h
e stan
d
a
rd
(±10
ppm (.001%)).
The front-panel ΕΧΤ ACC
UR
ACY la
mp
will lig
h
t w
h
e
n
t
h
e
i
n
st
r
u
m
e
n
t is
ph
ase loc
k
e
d
2ο eit
h
e
r
t
h
e exte
rn
al so
u
rce o
r
t
h
e i
n
te
rn
al TCXO .
WA
RM-UP
TI
ME
Wh
e
n
t
h
e instrument ί 5
t
u
rne
d
on
f
r
o
m
α col
d
start, t
h
e
fr
ont-
p
a
n
el ACC
UR
ACY i
nd
icator may fles
h
, indicating
an
u
nloc
k
e
d
co
nd
itio
n
.
As soon as
t
h
e ACCURACY
i
n d
icato
r
sto
p
s flas
h
i
n
g, t
h
e i
n
st
rum
e
n
t is wa
r
me
d
up an
d
h
as an accuracy of i1
ppm.
T
h
e warm-up ti
m
e is ty
p
ically
less t
h
an 5 mi
nu
tes at 25° C a
mb
ie
n
t tem
p
erat
u
re .
T
HE
O
R
Y O
F
O
PER
ATIO
N
R
efer to
F
ig
u
re 8/5 Α -2 .
ΝΟΤΕ
If
t
h
e front-panel
FRE
D
VERN
I
ER
is not in its CA
L
p
ositio
n
, Option 5A is non-functional .
T
h
e
purp
ose of option 5Α is to phase lac
k
t
h
e Μ 30-1/4
Crystal
Refere
n
ce to α
h
ig
h
e
r
acc
ur
acy
r
efere
n
ce . T
h
e
o
p
tion ci
r
cuit
r
y is contai
n
e
d
in
t
h
e Μ 153
I
n
ternal/
E
xte
r
nal
R
efere
n
ce mo
du
le, a
nd
includes α
t
un
e
d amp
lifie
r
, α
ph
ase
detector, α filte
r
, α co
m
pa
r
ator, α refe
r
e
n
ce mo
n
itor, and α
TCX0.
8/5 Α- 1
S
PE
CI
F
ICATIO
N
S
I
N
T
ERN
A
L
Fr
eq
u
e
n
cy Acc
ur
acy
t1
ppm
Tem
p
eratu
r
e Ra
n
ge
25 ° i5 ° C
Agi
n
g
1 pp
m
/yea
r
Sta
b
ility
<0 .2 p
p
m/
h
o
ur
afte
r
3 ho
ur
war
m-up
(Ty
p
ically afte
r
2
h
o
ur
warm-up)
R
eference
Output
10 MHz TT
L
E
XT
ERN
A
L
Fr
e
qu
e
n
cy Accu
r
acy
Equ
al [ο
exte
rn
al source
External Input
Fr equency
5 or 10
MHz
Acc ur acy
±1 ppm
Input
Level
ΤΤ L or .5 to 5
VRM
S
i
n to 2
k
o hm (sin e
o
r squ are wave)
INPU
T/O
U
T
PU
T CO
NNE
CTO
R
R
ear-
p
anel
BN
C
I
N
STA
LL
ATIO
N
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