FIRST TIME USE
3-6
Display
Before entering any parameters it will be found useful to look at the effect that pressing various
keys has on the display for the Signal Generator menu. This is the main display and it is divided
into a number of fields as shown in Fig. 3-4 below.
Signal source field
This field, at the bottom of the display, is divided into four panels, one each for three signal
sources (the third, C, source is not fitted) and one for the combiner. When a source panel is
highlighted, all the parameters shown on the screen apply to that source; for example, when the A
panel is highlighted, the displayed carrier frequency, RF level, modulation etc., apply only to the A
source. The selected signal source can be changed using the [A] and [B] hard keys.
The RF output from a source may be directed to its own output socket, or re-routed via the
combiner (either alone or in combination with other sources) to the combiner output socket. Signal
sources are combined using a menu accessed via the [SETUP] hard key.
The designation
A
ð
O/P
shows that the A source output is directed to the RF OUTPUT socket for
the A source. When
A
ð
Σ
is displayed it shows that the A source output is directed to the
combiner.
When no signal source is connected to the combiner the combiner panel shows
Σ
not used
. In this
instrument
not fitted
is always shown against source designator C.
When one or more sources are connected via the combiner to the CONNECTION TO RADIO
socket, the combiner panel displays this information by showing either
Σ = Α
or
Σ =
A+B
.
Note that the signal source field is displayed in all modes.
Carrier frequency field
This shows the current carrier frequency setting for the selected signal source. This field is
controlled by the
[Carrier Freq]
soft key.
When the frequency of the selected source is coupled to another source (so that it tracks it), an
arrow is shown together with the other source’s identity. In Fig. 3-4 for example, the B source is
shown coupled to the A source by the A source panel being highlighted and
ð
B
being shown in the
carrier frequency field.
RF level field
This shows the current RF level setting for the selected signal source. This field is controlled by
the
[RF Level]
soft key.
When the level of the selected source is coupled to another source, an arrow is shown together with
the other source’s identity (as for frequency coupling).
Frequency standard field
The type of standard is shown in this field together with its frequency. Frequency standard
selection is made from a menu accessed via the [UTIL] hard key.
This field also displays
Atten Lock
when the attenuator lock function is enabled.
Modulation state field
Here the modulation state is shown as either
ENABLED
or
DISABLED.
This is controlled
by the
[Mod ON/OFF]
key which switches all internal modulation on or off.
When pulse modulation is selected,
Pulse ON
or
OFF
is shown (an additional soft key
[Pulse
ON/OFF]
also appears)
.
