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External FM Source
To provide frequency modulation of the output sig
-
nal using a modulating signal from an external
source, first set up the external signal generator and
connect it to the MG369XB rear panel FM IN connec
-
tor.
Next, access the FM Status menu (page 3-97) and
press Internal / External to select the external source
for the modulating signal. The External FM Status
menu (below) is then displayed.
This menu contains the external FM status window
that shows the current menu selections and the
measured FM Deviation (The FM deviation mea-
surement function measures the voltage of the ex-
ternal modulation signal and calculates the peak
frequency deviation).
Press On/Off to turn FM on and off. The External
FM status display will reflect your selection as On
or Off; the FM modulation status area will reflect
your selection as External On or Off.
Press Edit Sensitivity to open the FM Sensitivity pa
-
rameter, then edit the current value using the cur
-
sor control keys, rotary data knob, or enter an new
value using the keypad and the appropriate termi
-
nator key. The FM Sensitivity range is ±10 kHz/V to
±20 MHz/V for Locked, Locked Low-Noise, and
Unlocked Narrow FM modes and ±100 kHz/V to
±100 MHz/V for Unlocked Wide FM mode. To close
the open FM Sensitivity parameter, press
Edit Sensitivity or make another menu selection.
3-100 MG369XB OM
Signal Modulation Local (Front Panel) Operation
ERR
This error message is displayed
when the external FM modulating
signal exceeds the input voltage
range.The message “Reduce FM In
-
put Level” also appears at the bot
-
tom of the FM status display. FM is
turned off until the modulating sig
-
nal is within the input voltage
range.