BISOPE series 38 Instrument level difference between Vibrometer vibrati...

BISOPE series 38- Instrument level difference between Vibrometer (vibration meter) and FFT (frequency analyzer; multi-channel vibration analyzer)

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Unlike temperature measurement, where you can select only Celsius or Fahrenheit and press a button, you need to know a lot about 'vibration' before measuring. How to select units and how far is the frequency range? What are the types of sensors and how to attach them? Also where? in which direction? Everyone should know how to measure. As a metaphor, 'knowledge is something that is easy for those who know it, unlike wisdom that is difficult even if you know it.' If you know about the vibration, it is easy to measure the selectivity of the instrument.

 

Distinct difference between vibrometer (vibrometer and frequency analyzer FFT vibration analyzer)

 

Recent vibrometers that can perform simple spectrum frequency analysis and trend storage are being sold at low prices, but in general, vibrometers do not have as precise or diverse functions as FFT (vibration frequency analyzer). Therefore, it is necessary to know the practical optimal knowledge that can identify these differences, and refer to the following.

 

item	vibrometer	Frequency analyzer (FFT, multi-channel vibration analyzer)
Appearance
output		​
Types and uses of instrumentation	Magnet-attached or probe-type machine surface vibration measurement, machine condition management	Select the number of simultaneous measurement channels, whether to measure FRF (resonance), machine diagnosis, long term recording (DAQ), rotor dynamics, front-end or hand held, for Labs and machine analysis
Sensor selection	-The magnet attached type is better than the probe stick type because measurement stability and high frequency are possible. -Sensitivity modifiable instrument (high sensitivity, high impact measurement possible) -Sensitivity modifiable instrument (high sensitivity, high impact measurement possible)	-For low frequency detection (using displacement sensor and DC sensor, or using acceleration of 500mV/g or higher)   -General type acceleration sensor (100mV/g)   -High impact acceleration sensor (10mV/g)
Unit

 

This data is very realistic and it is the result confirmed in the actual domestic industrial field, but it can be subjective and biased, so please refer to it.

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All copyright  korea CBM  written by BISOPE , vs72@naver.com, 070-4388-0415,  www.kCBM.kr

 

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BISOPE series 7 3 axis vibration sensor 3 axis vibration and accelerati...

BISOPE series 7- 3-axis vibration sensor (3-axis vibration and acceleration sensor)

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An accelerometer is the easiest transducer to measure vibration. Since the measurement direction of this transducer has already been determined, the sensor must be placed in the desired direction for measurement. It doesn't really matter if it's up or down. This is because vibration is repeated and if you want to know the relative movement, you have to use two or more sensors that measure it at the same time anyway. In this case, the concept of a phase is only additionally required. However, compared to a single axis vibration sensor, a triaxial vibration sensor literally means a sensor having the ability to measure the magnitude of vibration in three axes at the same time. It is easy to measure and you will be able to identify vibrations in all directions in a short time.

 

Advantages and disadvantages of Triaxial Accelerometer

Triaxial is described as each three-dimensional orthogonal direction in Z, X, and Y directions (H, V, A directions in the case of vibration diagnosis of rotating equipment) that are perpendicular to each other. The axes in each direction have an initial phase difference of 90 degrees from each other, and the 3-axis vibration acceleration sensor outputs the amount of vibration acceleration in each direction as voltage. Therefore, it can be said that the 3-axis vibration sensor has the following advantages.

 

First of all, it is possible to measure the vibrations in all directions at the same time. It measures the vibration in each axis direction at the same time without the need to measure it sequentially with several different sensors or at different times, so it is possible to prove the simultaneous state at the time and shorten the measurement time.

 

Second, it is possible to measure -----

 

On the other hand, the 3-axis vibration acceleration sensor is at least twice as high expensive as the combined price of all three single-axis sensors, and the average probability of failure (MTBF) of the single-axis sensor is shortened to 1 year compared to the manufacturer's recommended 3 years. do. However, in fact, the piezo-type accelerometer is more robust and less durable than expected, so it is not easy to check the broken state. Recently, like a gyro sensor, a modularized sensor capable of measuring 6-axis vibration has already appeared, and like MEMS, which basically employs 3 axes, new-technology vibration sensors with clear advantages of low frequency have already started to lead in price. The day when MEMS sensors will be used more often than piezos can be seen in the near future.

 

Key! Vibration sensor, accelerometer,, Acceleration, Accelerometer, piezoelectric effect, piezoelectric element,piezo,ICP,3 axis vibration sensor,3 axis vibration, vibration measurement ,mems, iepe, vibration education

 

All copyright  korea CBM  written by BISOPE , vs72@naver.com, 070-4388-0415,  www.kCBM.kr