Agilent X-Series Signal Generators User’s Guide 79
Using Analog Modulation (Option UNT)
Using an External Modulation Source
Using an External Modulation Source
Removing a DC Offset
To eliminate an offset in an externally applied FM or ΦM signal, perform a DCFM or DCΦM
Calibration.
NOTE You can perform this calibration for internally generated signals, but DC offset is not usually
a characteristic of an internally generated signal.
1. Set up and turn on the desired modulation.
2. Press FM/ΦM > FM Source > Ext1 or Ext2 > More > Setup FM Source > Ext DC Cal.
Performing the calibration with a DC signal applied removes any deviation caused by the DC signal,
and the applied DC level becomes the new zero reference point. When you disconnect the DC signal,
perform the calibration again to reset the carrier to the correct zero reference.
Using Wideband AM
Wideband AM uses the I input of the I/Q modulation system. When the wideband AM is turned on,
the I/Q is turned on and the I/Q source is set to external. If the I/Q is turned off or the I/Q source
is set to internal, then the wideband AM turns off.
Rear panel inputs are
described on page 13
AM, FM or ΦM inputs
Default
Currently selected
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