OPERATION
3-1-22
MODULATION ALC
The automatic levelling control (ALC) is used in conjunction with an external source and
can be disabled when not required. To enable the ALC, proceed as follows:
(1) At the Sig Gen menu, press [Select Source]. The display will show the Internal or
External Source Selection Menu (Fig. 3-1-10 or Fig. 3-1-13).
(2) If necessary press [Select External] to obtain the External Source Selection Menu
(Fig. 3-1-13).
(3) Select the required external source from the options shown, e.g. [Ext 1 ALC
Coupling] or [Ext 2 ALC Coupling]. The pictogram at the end of each line will
change from a horizontal line to an arbitrary waveform symbol when the source is
selected.
(4) Return to the Sig Gen menu by pressing [SIG GEN]. The legend Ext Mod 1 (or 2)
ALC coupled appears at the bottom of the display.
(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 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.
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