Vibration measurement & data evaluation in testing

Featured Product from Gantner Instruments, Inc.

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Vibration measurement and data evaluation for testing and monitoring applications
Whether your challenge is condition monitoring, predictive maintenance, structural health monitoring(SHM) or efficient data storage and analytics in various test applications – a comfortable and easy-to-run vibration measurement setup is crucial.
We provide powerful I/O modules for any type of accelerometer with connectors for most standard sensors or you can adapt them to your needs.
Both types of modules provide a galvanically isolated sensor supply voltage (15V DC) and samples with 20kHz on each channel. The sensor inputs can be switched from differential to single-ended inputs by software. In addition, these modules provide one single-ended input per sensor input, which can be used e.g. for temperature compensation. With this feature, measurement setups with the highest accuracy are possible.
Acquire data from MEMS sensors with the Q.series X A108-4M1 and A108-2M3 I/O module
MEMS(Micro Electro Mechanical System) sensors are often used for low-frequency vibration measurements down to DC. These MEMS or K-Beam sensors require a supply voltage for operation. The new Q.series X module A108 provides the sensor supply for simple and convenient setups. It is possible to connect four single-axis MEMS sensors to the A108-4M1. This module comes with standard 1/4-28 sockets (4-pole). Furthermore, two tri-axis MEMS sensors can be connected to the A108-2M3 module with its DSUB 9 pole sockets.
Connect IEPE / ICP® sensors to the Q.series X A111 I/O module
You have to set up a measurement chain with sensors based on IEPE(Integrated Electronics Piezo Electric), ICP®, ISOTRON®, DeltaTron, Piezotron or PiezoStar(physical unit mv/g)? Our four-channel A111 provides the right signal conditioning with sensor supply according to IEPE or ICP® standards. Each channel samples with 100kHz and is galvanically isolated to other channels, to the power supply, and to the bank for powerful filtering and evaluation on the I/O level and a maximum on robustness.
Datasheet: A111 IEPE, 4 Ch
A141 Charge Amplifier for Piezo Electric sensors
When it comes to very special applications with limited installation space, high surface or ambient temperature, PE(Piezo Electric) sensors are the methods of choice. With their direct charge output(physical unit pC/g) these sensors have no electronic items in the sensor housing, making them small and robust against high temperatures. However, these sensors require external signal conditioning to convert the charge into a standard voltage signal. In the past, this was achieved by external devices such as inline charge amplifiers and their output was connected to the data acquisition system.
With the Q.series A141 charge amplifier, we offer a four-channel signal conditioning I/O module that covers the need for external devices.
Depending on the charge signal to be measured, you can choose between two modes for either fast transient and pulsating signals or almost static ones. Every time you are facing a very broad measurement range, A141 might just be a perfect choice. Use it for your measuring challenges with accelerometers, force, or pressure sensors.
Datasheet: A141 Piezo, 4Ch
For a detailed understanding and comparison of the different sensors and signal conditioning, technologies take a quick look at our one-page overview.
You can connect all of these I/O modules to our powerful data acquisition controller and smart edge device Q.station X. The Q.station X can evaluate the vibration data for you to reduce the number of stored data points and to announce warnings or alarms independently of any connected computer.
The following parameters can be calculated in the time domain:
  • RMS
  • Peak
  • Peak-to-Peak
  • Crest
These parameters are evaluated in the frequency domain:
  • Vibration velocity
  • Vibration displacement
  • Max Amplitude @ Frequency
  • FFT spectra(with Plugin)
  • and many other trend parameters
Setting FFT parameters in GI.bench
The configuration of the parameters can be easily done using arithmetic variables or the FFT settings in GI.bench.
All these parameters can be used to trigger the storage of the raw data with pre- and post-trigger conditions. This helps to keep the data volume low, as raw values are only stored in case something important has happened.
Configuration of statistical functions for long-term trend analysis
Additional statistical functions such as maximum, minimum, average or standard deviation are available for long-term trend analyses. With the help of these functions, trend parameters can be formed from parameters such as RMS, peak value or effective vibration velocity. The duration for calculating the statistical function can be set individually, e.g. a maximum of the RMS value over one minute.
For data storage and visualization on the computer level, we offer our software GI.bench. This powerful and well-designed piece of software is more than just a tool for configuring the measurement chain. It provides data storage capabilities including merging data streams from different controllers or a redundant and scalable storage platform independent from any windows based user interface.
But when it comes to how to visualize a large number of data points and provide overview dashboards, GI.bench underscores its strength. Easy to use drag & drop graphic elements such as YT / XY charts, gauges, bar graphs, bottoms, and sliders allow any kind of dashboard to be configured in seconds. Channels from the measurement system or variables that have already been evaluated can also be applied to the graphic elements by drag & drop. Even pictures or video streams from IP cameras can be integrated into the dashboards to show a perfect overview of the measurement setup.
If you want to share measurement data or need many screens to visualize all your data simultaneously, you can easily use standard web browsers to connect to the DAQ system and view dashboards.

Vibration Monitoring Essentials – An Overview of Acceleration Measurement Technologies

To select the appropriate accelerometer, a clear understanding of the application and its measurement tasks are essential. Download our whitepaper that explains the various types of absolute vibration transducers – accelerometers with pure acceleration outputs and their corresponding measurement chains. Included is a detailed overview of the PE, IEPE, and MEMS sensor types, the advantages and disadvantages of each, their required signal conditioning, and best-fit data acquisition systems.