Monitor Audio ASW100 User Manual download pdf (Page 197)

FFT Analyzer

AM700 Audio Measurement Set User Manual

4-85

am700 window 1.0

0.01 0.015 0.020

etc. for 513 numbers separated by white space. Spaces,

tabs, and Carriage return/line feed are considered

blank space.

The file consists of the header that defines the file as a window file for the AM700

version 1.0 followed by 513 floating point numbers, in ASCII format, that define the

weighting factor to be applied to the frequency bins. The numbers can be entered in

either exponential or decimal form (1.2e–2 or 0.012, for example). The file is stored

in the nvram:/windows directory for access by the AM700 when the User

window choice is selected.

Measurement Modes

In the FFT Analyzer there are two mode of operation: FFT analysis and Multitone

analysis. When you turn on the multitone analysis mode, the analyzer starts looking

for a multitone. When the application detects the multitone signal it is looking for, it

starts making various measurements and displays the results. It continues to make

these measurements as long as the multitone signal lasts. You can use the Meas.

Mode soft key, located beneath the large control knob assignment indicator, to

toggle between FFT analysis and multitone measurement mode.

Displays

In FFT mode the following View Setup choices are available:

Spectral. This is an FFT display of amplitude versus frequency. You set the

frequency span using either the control knob or directly through the FFT menus The

frequency axis for the display can be selected to display either linear or logarithmic

scaling.

Bar Graph. This display shows the bin widths and the bin amplitudes versus

frequency. The bins are completely filled from the bottom of the display to the peak

amplitude in a bin. When the display is expanded the rectangular shape of the bins

is demonstrated. An example of a expanded Bar Graph display is shown in

Figure 4-39.

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Monitor Audio ASW100 User Manual Page 197