Wavetek 3000 Instruction Manual page 18

OPERATION
this is the case, add
10 dB of fixed
attenuation and turn the
RF vernier
control toward maximum . The
unlevel
light should then go out .
2 .7 .6
FM Modulation - Internal
Set the mode switch to FMxl or
FMx100
and the
frequency to 400 or 1000 Hz .
Adjust the AM/FM vernier to the desired
peak deviation .
2 .7 .7 FM Modulation - External
CAUTION : Input
voltages greater than
t10 VDC or 10 VRMS should not be applied
to the external
modulation input con-
nector or damage .may occur to internal
circuitry of the Model 3000 .
Set the
mode switch to FMxl or FMx100
and the
frequency switch to
external .
Apply a 1O V p-p signal into 600 ohms to
the external modulation input connector .
This calibrates the
AM/FM vernier con-
trol .
The desired peak deviation can be
set .
For FM modulation the upper fre-
quency limit is 25 kHz .
33
29
25
21
17
13
9
5
MOD
T. P
7.3V
PIN
CONNECTION
1
N .C .
2 400
3 200
4 100
5
80
6 40
7 20
8
10
9 8
10
4
11 2
12 1
13 .8
14
.4
15
.2
16
.1
17
.08
18
.04
19
.02
20 .O1
21 . oo8
22 .004
23
.002
24
.001
25
ground
26 - 31
N .C .
32
7 .3V
33 - 35 N . C .
36
MOD . T .P .
Figure 2-7 . Pin Location & Identification
2-8
2 .7 .8
Vernier Control FM Position
Switch the
mode switch to
the FMxl or
FMx100 position and the frequency switch
to Vernier . Using the AM/FM vernier
output control, frequency can be varied
in a positive
direction up to 5 kHz in
the xl position
or 500 kHz in the x100
position .
2 .7 .9
Vernier Control - AM Position
Switch the mode switch to the AM posi-
tion and the frequency switch to Vernier .
Using
the AM/FM
vernier control
the
output amplitude can be varied . It also
enables more
than 20 mW of power to be
obtained
over
portions of the band .
2 .7 .10
Programming
Frequency
is programmable via a rear
panel
input connector set
by standard
8-4-2-1 BCD contact closures .
A mating
connector
is supplied with
each unit .
See Figure
2-7 for pin
location and
identification .
These connections are
in parallel with the front panel Lever
Indicator switches .
If the rear panel
programming is used,
the front panel
switches should
indicate all zeros .
Rear panel BCD
programming can be
im-
plemented by referring to Table 2-1 .
100's
10's
1's
.O1's
.001's
TABLE 2-1 . PROGRAMMING
Switch TTL
Logic "0" Open
>2 .2V
Logic "1" Ground <0 .4V