 22.01.2013 Maintaining its position as the forerunner of innovation, SDT announces the next major step forward for ultrasonic condition based monitoring.
When the SDT270 was released in October 2010 it represented an evolution for PdM and Reliability professionals. It was the first ultrasound data collector to feature survey driven temperature, tachometer, and static/dynamic measurements powered by an onboard synchronous database. Now, only two years later SDT builds on its success by adding vibration severity measurements to the SDT270.
With the new Acceleration feature on the SDT270 inspectors are able to measure, log, alarm, and perform analysis of vibration data. Basic vibration severity is measured using any of the SDT270 versions (SB, SS, SD, SU, DD, DU). Advanced data acquisition is possible with SDT270DD and SDT270DU versions only. Data acquisition provides data for further analysis through Ultranalysis Suite software.
- Vibration Severity Measurement
Vibration severity is indicated by four measurement choices on the SDT270.
- Velocity RMS
- Acceleration RMS
- Acceleration Peak
- Acceleration Crest Factor
- Frequency Range
The SDT270 provides two frequency ranges for vibration measurements
- 10 to 1000 Hz
- 10 to 10,000 Hz
- Data Acquisition Time (DAT)
The four vibration severity indicators noted above are calculated over the data acquisition time (DAT). The DAT is selected by the operator. As an example, when the user sets the DAT to 10 seconds and begins the measurement by pressing the “M” button on the SDT270 keypad, the SDT270 will buffer all instantaneous values, then calculate and display the results.
The DAT is adjustable from 0 to 80 seconds. When data is taken “on the fly” the user sets his DAT to zero (“0”) seconds.
- Vibration Data Acquisition
Two platform versions of the SDT270 (DD & DU) perform Data Acquisition of the acceleration signal over a selected duration. Data acquisition is used to process time data for time domain (TWF) and frequency domain (FFT) representation.
- Sampling Rate
While collecting vibration data for TWF and FFT analysis the inspector can adjust the length of his data sample. The available duration is between 0 and 60 seconds. The sampling rate is dependent on the frequency range setting.
- 32,000 samples per second for the frequency range [10-10,000 Hz]
- 4,000 samples per second for the frequency range [10-1,000 Hz]
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