Spider DSA User’s Manual
289
frequency range is set depending on the maximum order and the maximum RPM
of the Order analysis. The user will be able to set the Frequency range higher than
this range to obtain a higher frequency range for FFT analysis. The user cannot
decrease the Frequency range below the minimum value set by the EDM using
the Order analysis parameters.
Overlap Ratio is the ratio of the overlap between two consecutive frames of
data. A 50% overlap signifies a 50% data in a frame is filled by the existing data
and the remaining part of the frame is filled by the new data.
Window Type defines the data windowing function used in the FFT and order
analysis.
Average Strategy – defines the averaging type used in the FFT and order
analysis: exponential, linear or peak hold.
Average Number – defines the number of averages in a linear average or the
weighting factor for exponential averaging.
FFT Average On/Off turns the averaging defined by the above two parameters
On or Off. When the Averaging is On, averaging is done on the data and when Off,
averaging is not performed.
Input Channels Setup
The Input channel setting for an Order tracking test is same as the general setting
for any other test, Refer to Input Channels Setup for the complete setup details.
Output Channels Setup
The Output channels for the 7.5 hardware units of Spider 80X hardware are also
designed to act as tachometer channels.
The Output channel 1 is a dedicated tachometer channel which can support Order
analysis functions and must be used as a tachometer.
The Output Channel 2 can either be used as a Tachometer to calculate the RPM or
use it as an output channel to generate the desired output. Click on “Setup” menu
item and select the Output Channels to view the Output Channel settings.
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