Installation; Operating Procedure - Wavetek 3000 Instruction Manual

signal displayed
on the oscilloscope .
The instrument is now
ready for use .
2 .7
OPERATING PROCEDURE
No preparation for operation is required
beyond completion
of the initial
in-
stallation checks
contained in Section
2 .6 . To insure that the Model 3000 will
perform as stated in the specifications,
the instrument should
have a two
hour
warmup before using .
2 .7 .1
Turn On
Verify that
the power transformer pri-
mary is
matched to the line
voltage
available and that the proper fuse
is
installed (See Section 2 .3
Electrical
Installation . Turn the front
panel
switch "ON" . One or more front
panel
accuracy lights will be
illuminated
indicating an operating
condition .
NOTE : A flashing
indication on the
lights indicates an unlocked condition .
This should cease in
a matter of sec-
onds . If the flashing does not cease,
refer to the warranty on the back of the
title page . If the unit is
not going
to be used to the extreme limits of its
specifications, it can be used immedi-
ately,
otherwise a two hour warmup is
required .
NOTE : When working with active circuits,
transceivers, etc ., care should be used
to keep voltage or RF power from being
applied to the RF output
connector .
Damage may occur to the output attenuator
circuitry of the Model 3000 if this hap-
pens .
2 .7 .2 Frequency Selection
Select the frequency
desired with
the
six Lever
Indicator switches
on the
front panel . A frequency between 1 and
520 MHz can be selected with a
1 kHz
resolution .
2,7 .3
Output Level Selection
Set the output attenuator and vernier
to the
desired level . The output
is
continuously adjustable over a +13 to
-137 dBm range .
The level shown on the
attenuator added to the meter indication
equals the RF output .
NOTE : AM modu-
lation is
possible at levels above +3
dBm as long as the peak of the modulated
output does not exceed the +13 dBm max-
imum output level .
If this level is ex-
ceeded the unlevel light will illuminate
indicating an unleveled condition .
2 .7 .4 AM Modulation - Internal
OPFRATION
Set the mode switch to
AM and the fre-
quency switch
to either 400 or 1000 Hz
modulation rate .
Adjust the AM/FM ver-
nier to indicate the desired
modulation
depth .
2 .7 .5
AM Modulation - External
CAUTION : Input
voltages greater than
±10 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 AM and
the fre-
quency switch to external .
Apply a 10
V p-p signal into 600 ohms to the Exter
nal modulation
input connector .
This
calibrates the'AM/FM Vernier
control .
The desired modulation depth can then be
set . The upper frequency limit of this
input is 20 kHz .
NOTE :
When AM modulating, care must be
taken not to exceed the +13 dBm maximum
level or excessive
distortion and an
unlevel condition
can exist . In some
cases, a high % of AM
modulation may
cause the unlevel light to come on when
the RF
vernier control is at minimum .
This is caused by
the bottoming of the
PIN diode leveler
which in turn can
cause an increase
in distortion . If
2-7