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Chapter 21, Spectrum Analyzer Screen
Field Descriptions
Offset Freq
Frequency offset (RF Generator) sets the difference between the instantaneous
frequencies of the Tracking Generator and the center frequency of the Spectrum
Analyzer.
Operating Considerations
The offset can be a positive or negative value. When set to zero, the Tracking
Generator produces a sweeping signal that matches the Spectrum Analyzer’s tune
frequency.
Port/Sweep
This control performs two functions:
• The upper field specifies the output port of the Tracking Generator.
• The lower field specifies whether the Tracking Generator sweeps from low-to-high fre-
quencies (Norm), or from high-to-low frequencies (Invert). (The Spectrum Analyzer
always sweeps from low to high frequencies.) The swept frequency range is determined
by the Span setting in the Spectrum Analyzer’s Main Menu.
Operating Considerations
When using the Tracking Generator, if the output port is set RF Out, or the main
menu Input Port is set to RF In, internal instrument coupling can occur. For
the best isolation between the Tracking Generator and the Spectrum Analyzer, use
Dupl for the output, and Ant for the input.
For measurements on high-power devices, such as amplifiers, use the RF IN/OUT
port for the input.
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