v/r i—i mi iwi’i
(5)
Apply
a
signal to
the EXT MOD 1
or
EXT MOD
2
input
socket and vary the
level.
If the input applied
to the external modulation socket is outside the
ALC
range (at least 0.7
to 1 .4
V
RMS) HI or LO
will
be indicated and
an error message
will be displayed
at the top of
the
screen.
If
the level is within
the required range,
the arbitrary waveform
symbol will appear alongside the modulation value.
MODULATION MODES
Two
independent inputs
on the front panel allow external modulation
signals to be
summed with
signals from the internal oscillator and
a second optional internal oscillator
(if
fitted).
Thus up to four modulations
may be available at one time. These can
be combined to
give single, dual, composite
and dual composite modes.
Single
In the single mode,
only one modulation can be active at any one
time, and selecting
another modulation
cancels the first.
Dual
In the
dual mode, a common carrier wave is modulated
by two different types
of
modulation,
e.g. one AM and one FM.
Each type of modulation carries separate information.
Composite
This mode consists
of
two
modulating channels with similar
types of
modulation,
the
effective
modulation
being
the sum of the
two
waveforms
e.g.
FM1 +
FM2. This mode cannot be
used for pulse or wideband modulation.
Dual composite
This mode is similar
to single composite with each of the two modulating
channels being
the sum of two
sources, e.g. FM1 + FM2 and AMI +
AM2.
Modulation mode selection
In order
to select a different
modulation mode;
(1)
Press [UTIL]. Utilities
Selection Menu 1 will appear on the display.
(2)
Press [Mod'n Mode]. The
display changes to show the four options. Press
the
required soft key.
(3)
Press [SIG GEN]
to return to the Sig Gen menu where the
modulation and
individual source
parameters will be shown.
Note...
Full information on
the range of utilities can be found under
'UTILITIES'.
46882-074C 3-1-19
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