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CLIOwin 7 PCI User's Manual - Audiomatica

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9.2.1 TOOLBAR BUTTONS, DROP DOWN LISTS AND DISPLAYS<br />

Starts an FFT measurement. Right-clicking on it you open the associated drop down<br />

menu where it is possible to select the Continue switch. In this mode the<br />

measurement is not started from blank but accumulates with the previously stopped<br />

one; see Averaging (9.6) for details.<br />

Stops the current measurement.<br />

Enters the FFT Settings dialog box.<br />

Enables the Time Data display. The second graph that is activated behaves as an<br />

oscilloscope and displays the captured waveform correspondant to the last FFT<br />

analysis.<br />

Enables the Hold function. Depending on the setting entered in the FFT Settings dialog<br />

box, it is possible to hold either the minimum or maximum value per frequency point.<br />

Moves the equal loudness curve up of 1phon. See also 9.5.<br />

Moves the equal loudness curve down of 1phon. See also 9.5.<br />

data window<br />

Selects a weighting data window among the following:<br />

- Rectangular (no window)<br />

- Hanning<br />

- Hamming<br />

- Blackman<br />

- Bartlett (triangular)<br />

- FlatTop<br />

channel display<br />

Selects the input channel to display among the following:<br />

- Channel A only<br />

- Channel B only<br />

- Channel BAL (two channels used in balanced configuration)<br />

- Channel A&B (both channels displayed in different graphs)<br />

Y scale units<br />

Selects the measurement units among the following:<br />

- dBV<br />

- dBu<br />

- dBRel (with respect to the global reference level; see chapter 8)<br />

- dBSPL (for acoustical measurements)<br />

frequency smoothing<br />

Selects the frequency smoothing in fractions of octave from 1/48 to 1/2 of octave.<br />

target averages<br />

Inputs the total number of averages. Averaging is controlled by the setting in the FFT<br />

Settings dialog; see Averaging (9.6) for details.<br />

number of averages display<br />

Displays the number of the actual average; this number increases during the<br />

measurement unless, while in exponential averaging, the target has already been<br />

reached; see Averaging (9.6) for details.<br />

94 Chapter 9 - FFT

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