HP 33120A, User Manual

Page: 71 / 118

Peak Frequency Deviation
The peak frequency deviation represents the variation in frequency of
the modulating waveform from the carrier frequency.
•
Peak frequency deviation: 10 mHz to 7.5 MHz. The default is 100 Hz.
•
The carrier frequency must always be greater than or equal to the
peak frequency deviation. If you attempt to set the deviation to a
value greater than the carrier frequency (with
FM
enabled), the
function generator will automatically adjust the deviation to equal
the present carrier frequency.
From the front panel, “
MAX VALUE
” is displayed and the deviation is
adjusted. From the remote interface, a -221, “Settings conflict” error
is generated and the deviation is adjusted.
•
The sum of the carrier frequency and peak frequency deviation must
be less than or equal to the maximum frequency for the selected
function
plus 100 kHz
(15.1 MHz for sine and square, 200 kHz for
triangle and ramp, and 5.1 MHz for arbitrary waveforms). If you
attempt to set the deviation to a value that is not valid, the function
generator will automatically adjust the deviation to the maximum
value allowed with the present carrier frequency.
From the front panel, “
MAX VALUE
” is displayed and the deviation is
adjusted. From the remote interface, a -221, “Settings conflict” error
is generated and the deviation is adjusted.
•
Front-Panel Operation : Press
Shift Level
to set the peak deviation
(the value is displayed for approximately 10 seconds).
Before setting the deviation from the front panel, you must have
FM
enabled. If you attempt to set the deviation when
FM
is not
enabled, “
SELECT AM, FM
” is displayed.
•
Remote Interface Operation :
FM:DEViation {< peak deviation in Hz >|MINimum|MAXimum}
Chapter 3 Features and Functions
Frequency Modulation (FM)
80