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2.6 .2
I
N
ITIA
L
CO
N
T
R
O
L
AD
JU
ST
M
EN
T
Set th e inst rument front-panel controls as follows :
L
ever/ind icator switches
010 .000
FRE D VERN I E R
CA L
MOD U LATION MOD E
CW
MOD UL ATIO N FREΠ
1 kH z
M OD UL ATIO N FM/AM
0
OUTPU T Step
0
d
8m
O
UTPU T VERN I ER
f
u ll εω
2.6 .3
RF OUTPUT CHECK
Connect the equ ipm en t as shown in Fig ure 2-4 . The 10
MHz signal should be ^0 .9
V
pp
,
(Α high-frequency oscillo
scope mu st be
u
se d for
t
hese chec ks.)
2.6 .4
AM
M
OD UL ATIO N C HE C K (1000 Hz)
Set t h e
M
OD ULATIO N M OD E
s
witc h to AM, Move t h e
M
OD UL ATIO N F Μ !ΑΜ slider up to its 50% modulation
p
oi nt. Verify t h at the AM envelo pe
d
is playe d on th e
oscilloscope shows α peak-to-valley voltage
d
iffere nce of
- .45 V
a
nd α
p
eriod of 1 msec (see F igure 2-5) .
2.6 .5
ΑΜ MODULATION CHE CK 1400 Ητ )
Set t h e
M
OD UL ATIO N FRED switch to its 400 Hz
position . Verify that the AM envelo pe
p
erio d is 2.5
m
sec.
2.6 .6
F Μχ 1 CHE C K
Set the
M
OD ULATIO N MOD E switch to FM xt . Move the
MOD UL ATIO N FM/AM slider up an d down, V erify that
oscillosco pe shows an FM display (see Fig ur e 2-6 λ.
2.6 .7
FM x10 CHE CK
Set the
M
OD ULATIO N MOD E switch in FΜχ 10 and
repeat t
h
e above c
h
eε
k
.
2.6 .8
M
OD UL ATIO N FM/AM SLID ER CHE C K
(FRE QUENCY)
Set the F RE Q VERN I ER to "0 kH z" While leaving the
M OD UL ATIO N MODE switch in the FMx10
p
osition, set
t
he
M
OD ULATIO N FREQUENCY switch to DC . Verify
t
h at
m
oving the
M
OD ULATIO N FM/AM slider from 0 to
10 kHz
s
hows an increase in frequency an
t
he oscilloscope.
2.6 .9
M
OD U LATION FM/AM
S
L ID ER CHE CK
(O UTPU T)
Set th e
M
ODULATIO N M OD E switch to AM- Verify that
m
oving the
M
OD UL ATIO N FM/AM slider fro m 0 to 50
shows an increase in output am plit ud e.
ΝΟΤΕ
T
he UNLEVELE D light
m
ay come on duri ng this test.
2.6 .11
FRE D
V
E RN I ER CH ECK
Switch
t
h e FREQ VERN I ER out of CA L position, The
.001% ta mp shoul d go out, and the VERN I ER la mp sh ould
light. Moving th e VERN I ER from -5 kH z to +5 kHz
s
h ould
s
how α sligh t ch ange in frequency on oscilloscope,
2.7
OPER ATI NG PR OC E DURE
No
p
re paration for operation is re qu i red beyond comple.
ιίοπ of
t
h e initial installation chec ks co ntai ned in Section
2.6- To insure that the instrum e nt will
p
erform as stated
in the specifications, the inst rument s h ou ld
h
ave α τωο-ιτοιι1'
warmup before
u
si ng.
2.7 .1
TURN ON
Turn the POW ER switch to ON- One of the
f
ίοητ -ραηιι
ACC UR ACY lam p s will light, in dicating an operating
condition . Α flas hing light in dicates an
u
nlocked condition.
T h is s houl d cease in α matter of seco nds.
It the unit is ππι going to
b
e
u
sed to the extrem e limits of
ίιs specifications, it can be used imm ediately .
CA UTIO N
Wh en working with active ci rcuits, t ra n sceivers, etc.. care
m
ust
b
e used to
k
ee p DC voltage or
R
F powe r from being
applied to
t
he
R
F O U T connector, ot h erwise
d
amage
m
ay
occur to the output circuitry of the instru m ent.
23 .2
FREQUEN CY SELECTION
Se lect t he frequency
d
esired wit h
t
h e six Lever/indicator
switches on the 1rοη t- ραηαΙ . Α fre quency between 1 kHz
(M odel 30021 or 1 MHz ΙΜηλe ι 3001) an d 520 MHz can
be selecte d wit h 1 kH z
r
esol ution,
2.7 .3
OUTPUT LEVEL
S
ELECTIO N
Set t h e OUTPUT Step and VERN IER co ntrols fo r the
desired ou tpu t level . Th e output is continu o usly a dj ustable
over α +13 to .137 d8 m ra nge . Th e RF
o
utpu t equals t h e
level show n on the Step Α1τεηυαt ο r
d
ial algebraically adde d
to
t
he METER indication .
2.7 .4
A MPL IT UD E MOD UL ATIO N -
I
NT ERNAL
Set t h e MOD ULATIO N MODE switch to AM
a
nd
t
h e
M
OD UL ATIO N FREQUENCY switch to either 400 or
1000 . Adjust the
M
OD U LATION FM/AM slid er for th e
d
esired
m
odulatio n
d
epth.
2- 5
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