Agilent Technologies N8201A Service Manual download pdf (Page 100)

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100 Agilent N8201A Performance Downconverter Synthetic Instrument Module, 250 kHz to 26.5 GHz

4 BW/Avg

Avg/VBW Type

Displays the functions that enable you to automatically or manually choose one of the

following averaging scales: log-power averaging (video), power averaging (RMS), or voltage

averaging.

When you select log-power averaging, the measurement results are the average of the

signal level in logarithmic units (decibels). When you select power averaging (RMS), all

measured results are converted into power units before averaging and filtering operations,

and converted back to decibels for displaying. Remember: there can be significant

differences between the average of the log of power and the log of the average power.

The following are the averaging processes within the N8201A, all of which are affected by

this setting:

Trace averaging (see BW/Avg) averages signal amplitudes on a trace-to-trace basis.

Average detector (see Detector, Average) averages signal amplitudes during the time or

frequency interval represented by a particular measurement point.

Noise Marker (see Marker Noise) averages signal amplitudes across measurement points

to reduce variations for noisy signals.

VBW filtering adds video filtering which is a form of averaging of the video signal.

When Auto is selected, averaging for the current instrument measurement settings is

chosen

Auto selects Power (RMS) Averaging if Marker Noise is on, Band/Intvl Power is on, or

Detector is set to Man and Average. It selects Voltage Averaging if Amplitude, Scale Type is

set to Lin or Detector is set to Quasi Peak or EMI Average. For other conditions, Auto

selects Log-Power Average.

When manual is selected, the type is shown on the left side of the display with a #. When

auto is selected, the N8201A chooses the type of averaging. When one of the average types

is selected manually, the N8201A uses that type regardless of other N8201A settings, and

sets Avg/VBW Type to Man.

Key Path: BW/Avg or Auto Couple

Saved State: Saved in Instrument State

Factory Preset: Auto (Log-power)

Remote Command:

[:SENSe]:AVERage:TYPE RMS|LOG|SCALar

[:SENSe]:AVERage:TYPE?

[:SENSe]:AVERage:TYPE:AUTO OFF|ON|0|1

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Agilent Technologies N8201A Service Manual Page 100

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