Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Source Frequency = (Analyzer Frequency * Multiplier Numerator / Multiplier Denominator) +
Offset Frequency
Analyzer Start
Freq
(Hz)
Analyzer Stop
Freq
(Hz)
Multiplier
(Num/Den)
Offset Freq
(Hz)
Source Freq
(Hz)
1.0e6 2.0e6 1/1 0.0 1.0e6 – 2.0e6
2.0e6 4.0e6 1/1 100.0e6 102.0e6 –
104.0e6
2.0e6 4.0e6 -1/1 100.0e6 98.0e6 – 96.0e6
102.0e6 104.0e6 1/1 -100.0e6 2.0e6 – 4.0e6
98.0 96.0e6 -1/1 100.0e6 2.0e6 – 4.0e6
3.0e6 4.0e6 3/1 0.0 9.0e6 – 12.0e6
4.0e6 6.0e6 5/1 100.0e6 120.0e6 –
130.0e6
4.0e6 6.0e6 -5/1 100.0e6 80.0e6 – 70.0e6
Use of the YTF (Microwave or mm Preselector) with External Source Control
In most stimulus/response measurements that utilize External Source Control, the
source exactly tracks the tuned analyzer frequency. Consequently, preselection is
not needed, and you can achieve greatly superior amplitude accuracy and
repeatability by bypassing the YTF (Preselector) using the Microwave Preselector
Bypass control in the Amplitude, uW Path Control menu (note: this control is only
available if option MPB is installed).
There are rare but important cases, however, where the source is tuned to a
different frequency than the analyzer, using the Multiplier and Reverse controls in
the Source, Frequency menu. For example, you might be tuning the source to ½ of
the analyzer frequency when looking at second harmonic distortion in a DUT. In
these cases, it would be commonplace for there to be an undesired signal at the
analyzer input that is at an image frequency that you will want to reject with the YTF.
Understanding these cases is important for proper operation of the Microwave
Preselector with External Source Control, so that you only bypass it when it will
improve accuracy but not hinder the measurement.
Point Trigger
Shows point trigger type selected and navigates to the Point Trigger menu, which
lists all instrument point trigger types.
The instrument and source point trigger synchronization can be done using SCPI
bus commands or by using external trigger output and input lines.
Spectrum Analyzer Mode User's &Programmer's Reference 461

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)