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2.4
DESC R I PTION O F FR ONT PANEL
Refer to Fig
u
re 2-2-
(1)
ACCUR ACY lamps ind icate the frequency acruracy
of t he instrument .
"VERNI E R" i nd icates +0 .001% +10 kH z
"0 .001%" ind icates " 0 .001%
"ΕΧΤ" i n
d
icates accuracy of external so urce
Typically, the lam p will flas h for α few secon
d
s a fter t h e
instrument is turned on Normally, α steady light i n d icates
that the instrume nt is phase-locked and t he f requency
accuracy ind icated is vali d . Α continuou sly flas h ing light
indicates that one or more of t he
p
h ase-lock ed loops is
open .
(2)
Lover/indicator switches
select an
d indicate output
fr eque n cy .
(3)
FRED VERN I ER
s
h ifts output fre q uency over a 10
kH z ra nge 1 .5 kH z to +5 kHz) .
W
ith
t
he FRE
D
VERNI ER in CA L , the instrument
accu racy is 10,001'ί5,
Wh
en the FRED
VE
RN I ER is not in
CA L, t he Ιη si r ιι me ίιΙ αεευιαεγ is 10.001% +10 kH z.
(4)
OUTPU T
ML
T
L
R ίπ dίεατ es H F output level over α
10
d
8 range in VRMS and d8m.
(51
UNLEVELE D
la m p
ligh ts
when
t he O UTPU T
ME TER read ing is not valid.
(61
OUTPU T Stop Αττεηυατοr co ntrols the RF output
level over α 140 dB range fro m +10 2 ο -130 d 8 m in 10 dB
steps. The Αττ e πυατο r d ial in dicates bot h dB m and VRMS.
(7)
RF O UT pr ovides the RF output signal f rom the
instrument (type Ν connector) .
(8)
OUTPU T VERN I ER controls the RF output level
ove
r
an 11 dB range.
(9)
M
OD U LATIO N F ΜΙΑΜ slider determines the depth
of am plit ud e mo
d
ulation or peak fre quency
d
eviation
d
epen ding on the setting of the
M
ODUL ATIO N MOD E
switch (w
h
en
t
he
M
OD ULATIO N M OD E switch is set to
CW, the FM/AM slider
h
as no function).
(10)
M
OD UL ATIO N FRED switch selects the frequency
of the signal
u
se d to modu late the RF output . The instru-
ment
h
as i nternal 400 Hi and 1 kHz sources, and α DC
source fo r manual am plitud e or frequ ency control . There
is also
p
rovision for an external m odulating sig nal .
(11) ΕΧΤ
M
OD U LATION
I
NPUT acce pts external modu
listing τί g παΙτ as follows-
ΑΜ
DC to 20 k Ι Ιι
FM (FRE D VERN I ER in CAL)
50 Hz to 25 kHz
FM (F RE D VERN I ER not in CA L)
DC to 25 kHz
Α 10 Vpp signal in to 600 ohms is re qu ired for FM/AM
sli
d
er calibration [π
b
e correct. Α smaller i nput voltage.
will ro.sult in proportional calibration ο 1 the FM !ΆΜι
slider, thu s, α 1 Vρρ signal into 600 ohm s will result in α
full scale calibration σ 1 10% AM, 1 kHz
p
ea k deviation
in F Μχ 1, or 10 kH z pea k deviation in FM x10.
Ι 121
M
OD ULATIO N MODE switch selects CW, ΑΡΑ ,
F
Μχ 1, or FMx10 operation .
1131
P
OW E
R
switch provides AC (rower to
P
ower Supply .
2.5
DESCRIPTION OF REAR PANEL
111
AC
L
I NE switch enables unit to operate from either
115 VAC or 230 VAC supply mains.
(2 Ι
AC
L
I NE Fu se (time- delay) ; 1 .0 am p for 115 VAC
operation; 0 .5 amp for 230 VAC operation.
(31
AC L I NE Co r d provides connection to AC mains via
3 prong
p
lug.
(4)
PROG RAMM I NG
J
AC K pr ovides connection for
ιΡηιοίe programming υ 1 fr equency.
(51
M
OD ΤΡ p r ovi des co nve nie nt connection for moni .
toring amplitu de and/or frequency of internal mo du lating
τηιιαΙ .
2.6
I NSTALLATIO N C HE CKS
Τh ε folinwiηg procedure is
u
se d to
d
etermi ne that τhe
instrument is operating
p
ro perly .
P
erfo rmance testing aud
calibration Procedures fo r
t
he instrument are containe d in
ot her sectio ns of this manual . It if is
d
etermine d
t
h at the
u
nit is not operating
p
ro perly, refe r to these sectio ns .
2.6 .1
TURN ON
Verity
t
h at t h e
p
ower-transfo rm er prim ary is matched to
the available line voltage, and
t
hat the proper fuse is
installed (see Sectio n 2.5) . Turn t h e POWER switch to ON
One of th e fron t-panel ACCUR ACY la mps will in dicate
operatio n. No warmup is needed for
t
he following chec ks .
2- 3
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