User`s manual

Table Of Contents
9.2.1 TOOLBAR BUTTONS, DROP DOWN LISTS AND DISPLAYS
gonew.gif Starts an FFT measurement. Right-clicking on it you open the
associated drop down menu where it is possible to select the Continue switch.
In this mode the measurement is not started from blank but accumulates with
the previously stopped one; see Averaging (9.6) for details.
Stops the current measurement.
Enters the FFT Settings dialog box.
Enables the Time Data display. The second graph that is activated behaves as an
oscilloscope and displays the captured waveform correspondent to the last FFT
analysis.
Enables the Hold function. Depending on the setting entered in the FFT Settings
dialog box, it is possible to hold either the minimum or maximum value per
frequency point.
Moves the equal loudness curve up of 1phon. See also 9.5.
Moves the equal loudness curve down of 1phon. See also 9.5.
data window
Selects a weighting data window among the following:
- Rectangular (no window)
- Hanning
- Hamming
- Blackman
- Bartlett (triangular)
- FlatTop
channel display
Selects the input channel to display among the following:
- Channel A only
- Channel B only
- Channel A&B (both channels displayed in different graphs)
Y scale units
Selects the measurement units among the following:
- dBV
- dBu
- dBRel (with respect to the global reference level; see chapter 8)
- dBSPL (for acoustical measurements)
frequency smoothing
Selects the frequency smoothing in fractions of octave from 1/48 to 1/2 of
octave.
target averages
Inputs the total number of averages. Averaging is controlled by the setting in the
FFT Settings dialog; see Averaging (9.6) for details.
number of averages display
Displays the number of the actual average; this number increases during the
100 9 FFT, RTA AND “LIVE” TRANSFER FUNCTION