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EAW Smaart 6 Operation Manual Analysis Modes and Display Types

Figure 3-10 Impulse Response window

NOTE: FFT Frequency Resolution (FR) is not displayed in Impulse mode since the im-

pulse response is a time-domain display.

Type

Select the desired type: Log, Lin, ETC.

FFT

Select the FFT size, from 128 to 512k points. Note that changing the FFT size also

affects the time constant (TC) below.

Displays the time constant for the selected FFT size. Selecting a different time constant

from this list is another way to set the FFT size.

Averages (Avg)

This field sets the number of FFT frames to record. For a value greater than 1, the

recorder collects the specified number of frames then averages them to produce the

final measurement result. The principal reason for doing this is noise rejection: each

doubling of the averages increases the measurement’s S/N by 3 dB, down to the SUT’s

actual noise floor, whichever is higher.

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EAW Resolution Spécifications Page 53