Spider DSA User’s Manual
107
High-Pass Filter Fc (Hz) sets the digital high-pass filter frequency, used to
block spurious low frequency and DC signals. To measure very low frequency or
DC signals set this value to zero and use the DC-SE or the DC-DI input mode.
Time Weighting defines the time weighting for exponential averaging. (Only
available in acoustic test)
Time Interval is the time period of calculating Leq for each individual channel.
(Only available in acoustic test)
If the Modal Data Acquisition (MDA) function was enabled during the progress of
creating a new FFT test, Click the MDA button to show the expanded MDA
definition of each channel’s input. Provision is made for roaming excitation
(impact) tests, roving response shaker tests and permanently installed multiple
input and/or output modal tests.
Figure 62. MDA Parameters in Input Channel Table (FFT)
In Acoustic Analysis tests there are two additional channel properties, Time
Weighting and Time Interval as shown below.
Figure 63. Input Channel Table (Acoustic)
On the top of the tab there are a series of buttons used to manage the channel
settings. Fill allows the settings of one channel to be copied into all the remaining
channels (Fill All) or only to a range of channels (Fill Range).
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