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Spectrum Analyzer 2-28 Amplitude Menu
Spectrum Analyzer MG PN: 10580-00349 Rev. M 2-57
Units & Detection Menu
Key Sequence:
Amplitude > Units & Detection
Units: Press this submenu key to select the amplitude unit: dBm, dBV,
dBmV, dBµV, Volt, Watt, dBW, Amp, or dBA. When measuring Field
Strength, values may be displayed in dBm/m
2
, dBV/m, dBmV/m, dBµV/m,
Volt/m, Watt/m
2
, dBW/m
2
, A/m, dBA/m, or Watt/cm
2
. See Figure 2-25
on page 2-40 . Press Back to return to the Amplitude menu.
Detection: Several detection methods tailor the function of the instrument
to meet specific measurement requirements. There are often more
measurement points across the screen than display points. The various
detection methods are different ways of dealing with how measurement
points will be shown at each display point. The Detection submenu is
illustrated on the lower left.
Peak: This method causes the largest measurement point to be
shown for each display point, assuring that a narrow peak is not
missed.
RMS/Avg: In the Preset case, when the VBW/Average Type is set to
Linear, this method detects the average power of measurement points
that go into the display point. When VBW/Average Type is set to Log,
the traditional average of log(power), such as dBm, is displayed for
the detector, as well as for VBW and trace average.
Negative: This method causes the smallest measurement point to be
shown for each display point. It is especially useful in zero span, to
see if the signal amplitude drops briefly. The method is also useful
when looking at modulated signals, to see if some frequencies are not
being used.
Sample: This is the fastest detection method because for each
display point, only one frequency point is measured. Use this method
when speed is of paramount importance and the possibility of missing
a narrow peak is not important.
Quasi-peak: When this selection is made, resolution bandwidths and
video bandwidths of 200 Hz, 9 kHz and 120 kHz are available. This
detection method is designed to meet CISPR requirements.
Back: Returns to the “Amplitude Menu” on page 2-56 .
Figure 2-42. SPA Units & Detection Menu
Detection
Back
RMS/Avg
Negative
Sample
Quasi-peak
Peak
Back
Units & Detection
Units
Detection