Wavetek 3001 Instruction Manual page 15

2.7 .5 AMPLITUDE MODULATION - EXTERNAL
CA UTION
Input voltages
greater
t
han -10 VDC or 10 VRMS should
not
b
e app lied to the ΕΧΤ
M OD INPUT connector, or
d
amage may occur to
t
he instrument.
Set the
M
OD U LATION MOD
E
switch to AM an
d
t
he
M
OD ULATIO N FRE
D
switch to EXT. Apply α 10
Vp
p
signal into 600 ohm s to
t
he ΕΧΤ
M OD I NPU T connector,
Th is cali br ates the MOD ULATIO N FM/AM slider . The
d
esired modulation d ep t h ca n
t
hen
b
e set, The upper
frequ ency limit of
t
his bφυ t is 20 kH z .
ΝΟΤΕ
W
h en AM m o
d
ulating, ca re mutt be ta ke n not to exceed
t
h e +13 dB m m aximum level or excessive
d
istortion and
an
u
nlevele d condition can exist. In some cases, α
h
ig h %
AM
m
ay cause t he UNLEVELE D light to come on when
the O UTPU T VERN IER control is at minimum . T
h
is is
caused by "bottoming"
o
f
t
he PIN diode levele r whic h,
in
t
urn, can cause an increase in
d
istortio n. If this is
t
he
case, add 10 dB of fixed atte nuation, and
t
urn
t
he OUT-
PU T VERN I ER control toward maximum. T he UN-
LEVELE D light sh ou l d
t
h en go out.
2.7 .6 FREQUENCY
M
OD U LATION -
I
N T ERNA L
Set the
M
OD UL ATIO N MOD E ;Witch to FΜχ l or FM x10
and
t
he
M
OD UL ATIO N FREQ switch to either 400 or
1000 . Adjust the
M
OD ULATION FM !ΑΜ slider to the
desire d pea k deviation .
2 .7 .7
FRE
Q
UEN
CY MOD
UL
ATIO
N
-
E
XT
ERN
A
L
CA
U
TIO
N
I
npu
t voltages t
r
eater t
h
e
n
!10
V
DC or 10
VRM
S s
h
o
u
l
d
not
b
e ap
p
lie
d
to t
h
e ΕΧΤ
M
OD I
NPU
T co
nn
ector, or
d
amage
m
ay occur to
t
h
e . instrument,
Set the MOD ULATIO N MOD E switc h to F
M
xt or FM xl0
a nd
t
he
M
OD ULATION F RE D switc h to EXT. Apply a
10 Vpp signal to t h e ΕΧΤ M OD I NPUT connector (600
ohms) . This cali b rates the
M OD ULATIO N FM/AM slider .
The
d
esired pea k deviation can now no set.
F
or FM mo du -
lation, t h e upper frequency li mit is 25 kHz : the lower limit
is 50 Hz with
t
h e FRED VERN IER in CA L. o r DC with
t
he
FRED VERN I ER not in CA L position.
2.7 .8 MOD ULATIO N FM/AM S LID ER -AM
Set the
M
OD UL ATIO N MOD E switch to AM and
t
he
M
OD UL ATIO N F R E Q switch to DC .
U
si ng t he ΜQD U-
2 - ξ
L
ΑΤΙΟΝ FM/AM slider,
t
he output amplitude eαη be
varied . 11
also
enables more t h an 20 mW of power to be
obtained over
p ortions of t h e ha nd .
2.7 .10
F
IitQ VERN IE R
Wh en the FRED VERN I E R is in CA L, output fre que n cies
h aving an accuracy of τ 0,001% m
ay
b
e selected by the
L ever/I nrlicator switches with α resolution of Ι kH z. Wh en
the F RE
D
VERN IER is not in CA L, the selected output
frequency can
b
e sh ifte d Σ 5 kH
z
wit h
t
he FRED VERN I E
R
control .
T h e output frequency at
t
he "0" kH z
p
osition of
t h e FRE
D
VERN I ER co r respo n ds closely to the ou tput
freq uency in CA L .
2.1 .11 PR OG RAMM I NG
F
re qu ency is
p
rogramma ble via
a
rear-panel input
εσηηeειπι
u
sing standar d 8Α -2-1
B
CD contact clos ur e or
TT L 5ίηιιαls, ( Ι ηηί c "ρ" = ορπιι , ,=+ 2 .2 V, Logic "1" -
closed - --:, 0.4
V .)
The rear ραηε " PROG RAMM I NG Jack
p
ins are in parallel with
t
he front panel
L
ever/I n
d
icator
switches ;
t
hu s, ifrear-panel
p
rogramm ing is to
b
e imp le-
mented, t he front-panel switches
m
ust indicate all zeroes .
Example - Το program 130 .152 MHz (refer to Fig ure 27 Ι :
FRE
D
DIGIT
1 3 0
1
5
2
GN D PI N S
4 7,8 - 16 18,20 23
εοχστ-_ι re
Fig
οα
0'2
οι
coo
οο4
1002
P
lot
q
r αυne
ν . ε .
ι , ιν
ιι . Γ ,
χ
L
Φ. T . t' ,
ιι
ιτ
ι t
14
1
5
ισ
t2
18
Ι α
2ο
τι
22
τι
24
25
26 31
ιz
ιs -3s
16
27
29
25
21
17
17
9
5
Ι
ατ
αα
ιι -
τ )
Ο ιι
ι 1
2) 1 σ 77
ι ι
CF)
τι
τα
ι
1
Gee
> o-
ιι
ια
C IS )
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ια ιι ~~
ΟΛΟΛΟΛΟ
<
F
ig
u
r
e 2-7,
p
in I
d
e
n
tification