3 Spectrum Analyzer Mode
3.5 ACP Measurement
In all the above cases:
–
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 Correction
Sets the measurement noise floor correction function to On or Off. On enables
measurement noise correction when the measured power in the reference channel
or any offset is close to the noise floor of the instrument. Off turns these corrections
off.
In instruments with the noise floor extensions option (option NFE) enabled, there are
two ways to compensate for the analyzer noise floor: through the NFE and through
this noise corrections control. The techniques are results are similar but not
identical. NFE uses a model of the analyzer noise floor, adapted to the current
conditions such as center frequency, RBW and ambient temperature. The
parameters of this model are measured in the factory or field calibration in a highly
averaged measurement. So, they are consistent. However, because the model is
1084 Spectrum Analyzer Mode User's &Programmer's Reference
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