User`s manual

3-39

Operating Procedures

3. Operating Procedures

(2) Detailed setting

Clicking the [Options] button opens the following dialog box. Make settings as

needed. (You do not have to make these settings under normal conditions.)

(E)

(F)

(G)

(E) Number (number of data points)

Set the number of FFT computation points for mechanical system diagnosis.

The larger the number of points, the higher the measurement accuracy, but the

longer the time needed uploading data. Using a small number of points for initial

rough measurements and then increasing the number of points for final detailed

measurements will reduce the measurement time. Basically make measurements

using the maximum number of data points (4096).

(F) Window ( windowing function)

A windowing function is applied to the data. If it is difficult to see the measured

waveform, changing this setting may make it easier to see. You can select from

among "Hanning", "Hamming" or "Nothing". Basically make measurements using

"Hanning".

(G) Operation ( operation adjustment range)

Reducing this setting narrows the operation range during measurement. But this

makes it difficult to see the waveform in a low frequency region. If difficult to see

the waveform in a low frequency region in the default setting, then change it to a

larger value. Units for this parameter are as follows:

Rotary motor: rotations (number of revolutions)

Linear motor: magnetic pole pitch (mechanical length equal to 360° electrical

angle)