FIRST TIME
USE
First time users can
quickly become familiar
with
the principles
of control and display by
carrying
out
the following
exercise, which
demonstrates
how
to set up a typical basic signal
having
the
following
parameters:
Carrier frequency:
100 MHz.
Output
level: 10 dBm.
Amplitude modulation:
30% depth at 1 kHz.
Switching on
(1)
Before switching the instrument
on, check that the voltage selector
has been set to
the value
of the power supply as described
in Chap.
2,
and that no signal voltage
is present on the PULSE INPUT
socket.
(2)
If
the default display shown in Fig. 3-1-3,
Fig.
3-1-4
or Fig.
3-1-5
is not obtained,
a previous user
may
have
set the instrument to switch on with
one of the user
memories
recalled rather than using
the default factory settings. Before
proceeding any further
you
should
reset this selection, see 'Power
up options'.
Switch off and
on again. Alternatively use the MEM
key
followed
by entering 50
and terminating by pressing the [enter]
key. This will reset the instrument
to the
factory default setting.
If the RF level units and
the intemal/extemal standard are not as shown, they
can
be changed
as described on Page 3-1-42, ’RF level
units' and Page
3-1-36
’Selection of frequency
standard’.
(3)
Observe
that the main menu
appears on the display showing default parameters
for FM. The soft
key label marked [Carrier Freq.]
is highlighted (i.e. the line
bordering the label is increased
in thickness
to about
1 mm),
which
means that
anything entered
at this stage will change the carrier frequency.
(4)
If necessary,
adjust the display for brightness and contrast,
see UTILITIES'
Page
3-1-34.
Changing the value
of the selected parameter
If an error is made when
keying in, press the soft key again and key in the
correct value.
If an error message
is displayed, it can be cancelled
by entering a value
which
is within limits.
(1
)
Using
the numerical key pad, enter 100 MHz
by pressing keys
[1],
[0], [0]
and the
key marked [MHz/mV/ms].
Observe that the Carrier Freq. display
changes to
100.000
0000 MHz.
(2)
Press [RF level].
The RF level soft key label is now highlighted.
(3)
Using the numerical
key pad, enter 10 dBm by pressing keys
[1], [0]
and the key
marked
[Hz/dB/radj. Observe that the RF
Level display changes to 10.0 dBm.
(4)
Press [AM]
on the left-hand side of the display.
The menu will now change to
display AM modulation parameters in
the lower panel. The [FM Devn
.]
soft
key
on the right-hand side
of the menu changes to [AM
depth] and this label is now
highlighted.
AM disappears
from
the left-hand
side.
46882-074C
3-1-9
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