3 Spectrum Analyzer Mode
3.3 Channel Power Measurement
–
The RBW to be used in the calculations is the equivalent –3 dB bandwidth of the
current RBW filter
–
The rules apply whether in swept spans, zero span, or FFT spans
Ranges
Option Option # Phase Noise Option Range
No EPx Option 1 Best Close-in [offset < 20 kHz]
2 Best Wide-offset [offset > 30 kHz]
3 Fast Tuning [same as Best Close-In]
EP0 4 Best Close-in [offset < 600 kHz]
1 Balanced [offset < 600 kHz]
5 Best Spurs [offset < 600 kHz]
2 Best Wide-offset [offset > 800 kHz]
3 Fast Tuning [same as Best Close-In]
EP1 1 Best Close-in [offset < 140 kHz]
2 Best Wide-offset [offset > 160 kHz]
3 Fast Tuning [single loop]
EP2, EP3, EP5 1 Best Close-in [offset < 70 kHz]
2 Best Wide-offset [offset > 100 kHz]
3 Fast Tuning [medium loop bw]
EP4 1 Best Close-in [offset < 90 kHz]
2 Best Wide-offset [offset > 130 kHz]
3 Fast Tuning [same as Best Close-In]
Noise Floor Extension
Lets you turn on/configure the Noise Floor Extension (NFE) function. Some Modes
(such as Spectrum Analyzer Mode), support two states of NFE, Full and Adaptive.
The ON state (in Modes which do not support Adaptive NFE) matches the FULL state
(in Modes that do support Adaptive NFE).
In ON or FULL NFE, the expected noise power of the instrument (derived from a
factory calibration) is subtracted from the trace data. This will usually reduce the
apparent noise level by about 10 dB in low band, and 8 dB in high band (>~3.6 GHz).
In Adaptive NFE, there is not the same dramatic visual impact on the noise floor as
there is in Full NFE. Adaptive NFE controls the amount of correction that is applied
based on other instrument settings like RBW, averaging and sweep time. Adaptive
NFE controls the degree of potential improvement in the noise floor to give more
Spectrum Analyzer Mode User's &Programmer's Reference 671
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