83
Chapter 3 Features and Functions
Frequency Modulation (FM)
3
Modulating Source
The function generator will accept an internal or external modulation
source for FM.
• Modulating source: Internal or External. The default is Internal.
•
If you select the External source, the carrier waveform is modulated
with an external waveform. The frequency deviation is controlled by
the ±5V signal level present on the rear-panel Modulation In
connector. For example, if you have set the deviation to 100 kHz,
then a +5V signal level corresponds to a 100 kHz increase in frequency
.
Lower external signal levels produce less deviation and negative
signal levels reduce the frequency below the carrier frequency.
•
Front-Panel Operation
: After enabling FM, press the
Source
softkey.
•
Remote Interface Operation
:
FM:SOURce {INTernal|EXTernal}
Modulation
In
+5 V
0V
-5 V
33210A users guide.book Page 83 Wednesday, July 16, 2008 11:16 AM
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