Wavetek 3000 Instruction Manual page 6

1 .1
INTRODUCTION
The Model 3000 is a rugged,
completely
solid-state Signal Generator covering
the frequency range of 1 to 520 MHz .
The output can be amplitude or frequency
modulated and the level can be set be-
tween +13 and -137 dBm.
1 .1 .1 Frequency Characteristics
The frequency of the unit is set via 6
front panel lever/indicator switches
which yield a resolution of 1 kHz .
In
addition, remote frequency program
mability is standard . This feature makes
the Mode1 .3000 Signal Generator ideally
suited for both semi and fully automatic
test applications .
The accuracy of the instrument is based
on a crystal-controlled oscillator that
serves as a stable frequency source for
the derivation of various reference
frequencies . These reference frequencies
arefed to phase locked loops that enable
the Model 3000 to provide high stability
signals to an accuracy of 0 .0017 over
its specified 1 MHz to 520 MHz
range .
In the CW and AM modes of operation the
overall accuracy of the unit is 0 .0017
including short term drift, long term
drift, incidental FM and variations due
to line voltage changes and temperature
changes . In the FM mode, the frequency
is accurate to 0 .0017 t10 kHz up to 5
kHz peak deviation and 0.0017 t45 kHz up
to 500 kHz peak deviation .
1 .1 .2 Modulation Features
The Model 3000 also features both inter-
nal and external amplitude and frequency
SECTION
1
GENERAL INFORMATION
modulation capabilities . Internal
modulation frequencies of 400 Hz and 1
kHz are available . In the FM mode of
operation, peak deviations
up to 500
kHz are attainable .
In the AM mode amp-
litude modulation to 907 is - attainable .
With the MODULATION MODE switch in either
of the FM positions and the MODULATION
FREQUENCY switch in the vernier posi-
tion, the front panel slide control po-
tentiometer can be used to continuously
vary the output frequency over either a
5 kHz or 500 kHz range .
With the MODULATION
MODE switch in the
AM position and the MODULATION FREQUENCY
switch in the vernier position the out-
put amplitude can
be varied via the
same front panel slide control . This
provides
a reference attenuator for
variation of a signal
level around a
specific point of interest . This oper-
ation can also enable the user to obtain
greater
than 20 milliwatts of power
over portions of the band .
1 .1 .3 Output Level Features
The output power is indicated on a
front panel meter calibrated in both
dBm and Vrms . A fifteen-position, 10
dB step attenuator used in conjunction
with an 11 dB vernier control provides
the user with
a range of +13 dBm to
-137 dBm . The calibrated output of the
Model 3000 is
leveled to
within ±0 .75
dB across the complete frequency range
of the instrument .