Selecting amplitude modulation
(1)
At the Sig Gen menu, press [AM], the [AM Depth] box is now highlighted.
(2)
Enter the required
modulation depth via the numerical key pad and terminate with
the
[%]
key. If the modulation depth requested
exceeds
99.9%,
the depth is
reset
to the maximum value
available and the message:
ERROR
56: AM Outside Limits
is displayed at the
top
of the screen.
(3)
Switch the AM ON or OFF
by
pressing [AM
ON/OFF]. The AM
information
is
displayed in
the
lower
half of the screen.
Selecting frequency modulation
(1)
At the Sig Gen menu, press [FM], the [FM Devn.] box will
be
highlighted.
(2)
Enter the FM deviation value via the numerical key pad and
terminate
it with
[Hz], [kHz] or [MHz],
(3)
Switch the FM ON or OFF via [FM ON/OFF].
The
FM
information
is
displayed
in the
lower half
of the screen.
Selecting
phase
modulation
Note that phase
modulation
is
not available
in the low noise modes of the 2040 series. To
use phase modulation the instrument must be
in the normal
noise mode
(see
Page
3-1-37).
(1)
At the Sig Gen menu, press [OM].
The [<&M Devn.]
box will
be
highlighted.
(2)
Enter the phase modulation deviation value via the numeric key pad and terminate
it with the [RAD]
key.
(3)
Switch the OM ON
or
OFF
via the ]<£>M ON/OFF] key. The <£>M information is
displayed in the
lower
half of the screen.
Selecting wideband frequency modulation
(1)
At the Sig Gen menu, press [Wideband FM]. The [Wideband FM] box will
be
highlighted.
(2)
The value can be changed via the key
pad
and frequency terminator key.
To
preserve the widest
bandwidth, the control of the wideband FM is carried out in a
series of Fixed steps and the signal generator automatically displays the calculated
fixed step which
is closest to the keyed
in
value. Applying a 1 V RMS signal to
the rear panel WIDE BAND FM IN socket will produce the indicated deviation.
3-1-14
46882-074C
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