Manfred Weber
Metra Mess- und Frequenztechnik in Radebeul e.K.
PC Vibration Measurement System VibroMetra

FFT/Order settings

In the event of an order analysis (Order, hz or Order, 1/min is selected as unit for the frequency axis) the FFT settings are modified. Since the scan during the order analysis is not performed time synchronously, as in the normal FFT, but angle synchronously, the settings relate to indications for speed rather than time. The options for Windowing function, Overlapping and Spectral statistics are identical to the ones of a normal FFT.
FFT/Order settings

Rotation frequency source

1. Rotation frequency source
Selecting the rotation frequency source (required for angle synchronous scan).

Rotation frequency range

2. Rotation frequency range
Enter rotation frequency range.

Order range

3. Order range
Indicate orders to be displayed (minimum 0).

Rotations for 1 spectrum

4. Rotations for 1 spectrum
Determine the rotations to be collected for 1 spectrum (similar to the time window of FFT). A higher amount leads to a higher line resolution.

Process data

5. Process data
The process data display inner parameters of the FFT that result from the selected settings. They are just for information.