Unipulse F381A - When the Displacement Advances Suddenly

52
4 SETTINGS AND CALIBRATIONS
52
SETTINGS AND CALIBRATIONS
Chapter
4
* Out of the points not kept in a waveform, those meeting the following conditions are kept in the
waveform by priority.
① Data kept as judgment points but not kept in a waveform when Peak Hold, Bottom Hold,
Peak to Peak Hold, Relative Maximum Hold, Relative Minimum Hold, or Inflection Point
Hold is used
② HI or LO result data not kept in a waveform when waveform comparisons are made
Example) When a hold or waveform comparison HI/LO judgment point does not fall
into the data that should be kept in a waveform
■When the displacement advances suddenly
・ When the displacement advances suddenly, a phenomenon occurs in which sampling is not
performed in time and the data that should be kept in a waveform is dropped. In that case, the
data of the immediately preceding displacement is kept in the waveform as the data of the
dropped displacement. If 10 or more pieces of data are dropped, a pace error will result and the
DPM OK signal will turn OFF.
* Guide for the displacement pace
Displacement pace at which one piece of data is dropped: waveform resolution
× 4000sps (/s)
Example) When the Measurement Length is 4000mm → 2mm×4000sps＝8000mm/s
Example) When the displacement advances suddenly
・ If the displacement pace is fast, sampling may not be performed at the section start point.
In that case, no load is held at the section start point, but the load in time for sampling near the
section start point is held.
Load
Displacement
Resolution (2mm)
12mm 14mm
Load sampling: 4000sps (every 250μs)
○ Load sampled by 250μs
● Load kept in a waveform
Priority
○ Hold or waveform comparison HI/LO judgment point
Load
Displacement
The previous data is kept
Resolution
in a waveform.
Resolution
10mm 12mm 14mm
Load sampling: 4000sps (every 250μs)
○ Load sampled by 250μs
● Load kept in a waveform
Resolution
16mm
No-sampling section
(2mm) (2mm) (2mm)