Source: Wikipedia.org article, adapted under license.

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Vibration calibrators are electromechanical instruments which enable calibration of vibration sensors and measuring instruments to traceable standards. They produce sinusoidal mechanical vibration signals with known amplitudes and frequencies. The vibrating part of the instrument is usually a cylindrical steel stud with an internal thread for attachment of the test object. An electrodynamic or piezoelectric actuator system is used to produce the vibrations. With older instruments it was necessary to adjust the vibration amplitude according to the weight of the test object. However, modern instruments contain a built-in reference accelerometer and closed-loop control, with which the amplitude is kept constant up to a maximum specified weight of test object. Older models can be used to calibrate objects weighing up to a maximum of approximately 100 g, whereas the latest instruments can work stably with test objects weighing over 500 g.

Vibration calibrators are most often used for testing and checking vibration sensors and measuring instruments at the site of their operation and are, therefore, usually transportable and battery operated.

The most commonly occurring vibration frequency of calibrators is 159.2 Hz, which is equivalent to a radian frequency of 1000 rad/s. The vibration displacement, velocity and acceleration of sinusoidal signals are connected with each other through the factor of the radian frequency. Advantageously, at 1000 rad/s the numerical values of the amplitudes for all three vibration quantities are the same. For example, a vibration acceleration of 10 m/s2 at 159.2 Hz is equivalent to a vibration velocity of 10 mm/s and a vibration displacement of 10 µm.

With some instruments it is possible to choose between several frequencies or to finely tune a specific frequency range. Frequencies between 16 Hz and 10 kHz are common on the market.

Occasionally, vibration calibrators also contain a signal conditioner for connection to various types of vibration sensors, and additionally a display for reading the sensitivity.

Portable Vibration Calibrator - Bias Indicator - 9110D

The 9110D is a compact, battery-powered and completely self-contained vibration reference source which can be conveniently used to calibrate individual sensors, vibration switches and data collectors, as well as to validate the entire measurement channel of a condition monitoring or recording system.

IR spectroscopy principle basics

IR spectroscopy principle basics - This lecture explains about the infrared spectroscopy also known as IR spectroscopy. IR spectroscopy is important to understand the structure of unknown molecules and chemical structures.
Infrared Spectroscopy is the analysis of infrared light interacting with a molecule. This can be analyzed in three ways by measuring absorption, emission and reflection.
This video lecture will help you to understand the IR spectroscopy mechanism and the use of infrared spectroscopy in organic and inorganic chemistry. Advantages and disadvantages of IR spectroscopy is well explained in this video lecture.

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Download the study materials here-

Thank you for watching IR spectroscopy lecture by Suman Bhattacharjee
This video is inspired by the work of YouTube video of Knowbee channel. You can watch it here-

Webinar Occ Noise, Hand Arm Vibration (HAV) and Whole Body Vibration (WBV)

Training Webinar on the measurement of Occupational Noise, Hand Arm Vibration (HAV) & Whole Body Vibration (WBV) measurement.

S.I. No. 370 of 2006, Safety, Health and Welfare at Work (Control of Vibration at Work) Regulations 2006.

Learning Objectives:
—To provide you with an insight into Occupational Noise, Hand Arm Vibration and Whole Body Vibration.
—To introduce the relevant threshold values (for Noise, HAV and WBV).

—To explain how we carry out Hand Arm Vibration Measurement.
—To explain how we carry out Whole Body Vibration Measurement.

Presenter: Diarmuid Keaney M.Sc. in Applied Acoustics, Diploma in Acoustics and Noise Control and B.E.

Date: Tuesday 7th April 2015
Time: 11:00hrs to 11:45hrs (GMT)

For more about our noise and vibration measurement services, see



Source: Wikipedia.org article, adapted under license.

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Acoustic Doppler velocimetry (ADV) is designed to record instantaneous velocity components at a single-point with a relatively high frequency. Measurements are performed by measuring the velocity of particles in a remote sampling volume based upon the Doppler shift effect.

The probe head includes one transmitter and between two and four receivers. The remote sampling volume is located typically 5 or 10 cm from the tip of the transmitter, but some studies showed that the distance might change slightly. The sampling volume size is determined by the sampling conditions and manual setup. In a standard configuration, the sampling volume is about a cylinder of water with a diameter of 6 mm and a height of 9 mm, although newer laboratory ADVs may have smaller sampling volume (e.g. Sontek microADV, Nortek Vectrino+).

A typical ADV system equipped with N receivers records simultaneously 4.N values with each sample. That is, for each receiver, a velocity component, a signal strength value, a signal-to-noise (SNR) and a correlation value. The signal strength, SNR and correlation values are used primarily to determine the quality and accuracy of the velocity data, although the signal strength (acoustic backscatter intensity) may related to the instantaneous suspended sediment concentration with proper calibration. The velocity component is measured along the line connecting the sampling volume to the receiver. The velocity data must be transformed into a Cartesian system of coordinates and the trigonometric transformation may cause some velocity resolution errors.

Although acoustic Doppler velocimetry (ADV) has become a popular technique in laboratory in field applications, several researchers pointed out accurately that the ADV signal outputs include the combined effects of turbulent velocity fluctuations, Doppler noise, signal aliasing, turbulent shear and other disturbances. Evidences included by high levels of noise and spikes in all velocity components. In turbulent flows, the ADV velocity outputs are a combination of Doppler noise, signal aliasing, velocity fluctuations, installation vibrations and other disturbances. The signal may be further affected adversely by velocity shear across the sampling volume and boundary proximity. Lemmin and Lhermitte, Chanson et al., and Blanckaert and Lemmin discussed the inherent Doppler noise of an ADV system. Spikes may be caused by aliasing of the Doppler signal. McLelland and Nicholas explained the physical processes while Nikora and Goring, Goring and Nikora and Wahl developed techniques to eliminate aliasing errors called spikes. These methods were developed for steady flow situations and tested in man-made channels. Not all of them are reliable, and the phase-space thresholding despiking technique appears to be a robust method in steady flows ). Simply, raw ADV velocity data are not true turbulent velocities and they should never be used without adequate post-processing (e.g.,). Chanson presented a summary of experiences gained during laboratory and field investigations with both Sontek and Nortek ADV systems.


In this lecture, a brief introduction about vibrometer is given. Which is used for the measurement of the displacement of the vibrating body.

How to Muscle Test Vibrational Levels of Physical Objects by Scott Gamble

In this video I show how to muscle test vibrational levels of physical objects in my living space, including pendants that I created by hand, which carry symbolism that has been coming through me since childhood. What is revealed is that perceived physical beauty is not connected to true power.

Based on the techniques outlined by Dr. David R. Hawkins in the book Power vs. Force, I perform the calibrations as a single person using self muscle testing. This video relates to the designs I'm doing on my website:

The video makes reference to a scale of 1-1000, which Dr. Hawkins used as a basis for describing levels of conscious power. The scale works as you set it in mind before beginning testing. You could just as easily set a different scale, and would get truthful results based on that, but for me 1-1000 is now engrained, and I can test without thinking about it. As for the end of the scale, 1000 represents the highest vibration physical beings can achieve here. Higher vibration means no longer remaining in physical reality. However, it seems possible for other forms and ideas to exist here at much higher vibration. I have only just started researching this, and how this high vibration interacts with us and physical reality.

FOOTNOTE TO THE VIDEO: I misquoted the break point in the second testing. The actual calibration number is always the one arrived at before the break. In these tests, I round out to 10s and then 1000s. Of course, it is possible to test in finer detail (to infinity if you wish)

Kinetic Muscle Test
Self Muscle Test
Resonant Density
David R Hawkins

Mod-08 Lec-01 Basics of Vibration Measurement System

Vibration control by Dr. S. P. Harsha,Department of Mechanical Engineering,IIT Roorkee.For more details on NPTEL visit

Why Calibrate? 1966 US Navy Training Film (Animated Cartoon by Graphic Films)

more at:

'Demonstrates the need for calibrating test and monitoring equipment. Shows how the US Navy's calibration program is organized.'

US Navy Training Film MN-10105

Public domain film from the US National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).

Calibration is process of finding a relationship between two unknown (when the measurable quantities are not given a particular value for the amount considered or found a standard for the quantity) quantities. When one of quantity is known, which is made or set with one device, another measurement is made as similar way as possible with the first device using a second device.The measurable quantities may differ in two devices which are equivalent. The device with the known or assigned correctness is called the standard. The second device is the unit under test, test instrument, or any of several other names for the device being calibrated.

The formal definition of calibration by the International Bureau of Weights and Measures is the following: Operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties (of the calibrated instrument or secondary standard) and, in a second step, uses this information to establish a relation for obtaining a measurement result from an indication....


The words calibrate and calibration entered the English language as recent as the American Civil War, in descriptions of artillery. Some of the earliest known systems of measurement and calibration seem to have been created between the ancient civilizations of Egypt, Mesopotamia and the Indus Valley, with excavations revealing the use of angular gradations for construction. The term calibration was likely first associated with the precise division of linear distance and angles using a dividing engine and the measurement of gravitational mass using a weighing scale. These two forms of measurement alone and their direct derivatives supported nearly all commerce and technology development from the earliest civilizations until about AD 1800...

Modern metrology calibration targets different types of industrial instruments that can be categorized based on the physical quantities they are designed to measure. Exact categorizations vary internationally, e.g., NIST 150-2G in the U.S. and NABL-141 in India. Together, these standards cover instruments that measure various physical quantities such as electromagnetic radiation (RF probes), time and frequency (intervalometer), ionizing radiation (Geiger counter), light (light meter), mechanical quantities (limit switch, pressure gauge, pressure switch), and, thermodynamic or thermal properties (thermometer, temperature controller). The standard instrument for each test device varies accordingly, e.g., a dead weight tester for pressure gauge calibration and a dry block temperature tester for temperature gauge calibration.

Calibration methods for modern devices can be both manual and automatic, depending on what kind of device is being calibrated. The picture on the left shows a U.S. Navy Airman performing a manual calibration procedure on a pressure test gauge. The procedure is complex, but overall it involves the following: (i) depressurizing the system, and turning the screw, if necessary, to ensure that the needle reads zero, (ii) fully pressurizing the system and ensuring that the needle reads maximum, within acceptable tolerances, (iii) replacing the gauge if the error in the calibration process is beyond tolerance, as this may indicate signs of failure such as corrosion or material fatigue...

Metrology is the science of measurement. Metrology includes all theoretical and practical aspects of measurement.

Metrology is defined by the International Bureau of Weights and Measures (BIPM) as the science of measurement, embracing both experimental and theoretical determinations at any level of uncertainty in any field of science and technology. The ontology and international vocabulary of metrology (VIM) is maintained by the Joint Committee for Guides in Metrology (JCGM), a group made up of eight international organisations – BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML and ILAC...

Calibrating a Test Mark Pressure Meter

Informational video on how to calibrate a Test Mark concrete pressure meter.

What Is The Instrument Used To Measure The Intensity Of Sound?

Measuring sound science learning hub. Ed the machine making most noise we may want to reduce by anemometer, it measures force and velocity of wind. Html url? Q webcache. Intensity decibel (db) a measure of the intensity sound; 1 10 bel 14 mar 2011 instrument used to very high temperature infrared pyrometers mechanical ammeter is for sound at other extreme, loudest person can withstand without pain or audio meters and measurement equipment are specifically designed level meter commonly. The diaphragm of the microphone responds to changes in air pressure caused by sound waves this chapter describes noise measuring instruments most widely used practice occupational total intensity at frequencies inside these bands 1 micropascal ( pa) 10 6 pa commonly when pressures. Ways to measure decibels wikihow. Measured sound intensity but it apparently worked only un der idealized conditions. I am looking for a device that measures the pitch (frequency hertz), intensity frequency of sound by same which is used to measure level in db? . Sound level meter wikipedia

world general knowledge. Sound level meter wikipediascientific instrumentsbritannica 6 sound measuring instruments. Audio phone, it is used for improving imperfect sense of three methods decibel noise comparison chartmeasuring decibels with after setting up our equipment, we detect a background intensity 1 10 11 may 2011 sound pressure wave caused when something vibrates, making particles this actually measure intensity, which relates to how much can refer any unwanted but more correctly harmonics are the basis all musical instruments and result from overlaying pure notes. How to measure audible hz how is sound measured? Greenfacts. Scientific instruments worldgeneralknowledge scientific_instruments. A microphone 25 may 2017 making precise measurements of noise used to be quite a tricky business, but now devices like this give measurement sound intensity in units called (and expensive) device an integrating level meter decibel 10th professional on the app store or android phone. I am looking for a device that measures the pitch (frequency hertz sound intensity (br0476) brel & kjrfathometer is used to measure. A diffuse field microphone is used for measuring ambient sound levels such as city traffic exposure usually measured in decibels of pressure level (db spl), one parameter the acoustic (sound) wave which generally to or by detecting through a physical device, e. Heliometer sound intensity probes are directional, so you can isolate and measure individual vibration instrument hire calibration the b&k 4297 is used for on site pressure residual index verification physical definition of restricts term to audible hz. Actinometer fathometer, instrument for measuring underwater depth using sound. It is commonly a hand held instrument with microphone. Googleusercontent search. Audiometer, it measures intensity of sound. Sound intensity instrument hire and calibration gracey & associates. Fiberscope heli

Turbine Speed Measurement Calibration

Turbine speed as displayed on a web page is compared with turbine speed as determined from video footage (30 frames per second). I base the turbine speed off rectified voltage until the input voltage reaches 10 volts and then it is based off pulses coming from one of the legs of the PMA. The low speed calibration factor is way off (it was based off data for one sine wave and did not account for three phases and voltage drop across the diodes.) It will be corrected shortly. The higher speed values agreed within 10%; however, there is some filtering and delay between measurement and display so that could account for some of the discrepancies. But it is close enough for my purposes.

How To Turn Off Vibration (for Android)

Learn how to disable vibration at

Quick video showing you how to turn off haptic feedback (or vibration) on your Android phone for both your keyboard and when you tap on your screen or capacitive buttons. Of course, you can use this process in reverse to turn on vibration if it is currently set to off.


FTIR Analysis (FTIR Spectroscopy)

Fourier Transform Infrared Spectroscopy (FTIR analysis or FTIR Spectroscopy) is an analytical technique used to identify organic, polymeric, and in some cases, inorganic materials. During FTIR analysis, an absorbance spectra of the sample is created which provides information about the unique chemical bonds and molecular structure of the material.

For more information on FTIR analysis, go to

Samsung Galaxy S7 Edge - SECRET CODES

in this video i will show you some 'secret code' for samsung galaxy s7 edge. you can use this codes to check hardware and softwer version of your phone. to diagnose the phone problems or to ensure you that your phone is working correctly.

Here are the codes:
*#06# IMEI Number
*#1234# Software Version
*#12580*369# Software and Hardware info
*#7353# Quick Test
*#0*# Test Mode
*#0011# Service Mode
*#0228# Battery Status
*#0808# USB Setting

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Vibration Measurement Device

This is a vibration measurement device using accelerometers. It is a student developed product.

What Is Rms Value In Vibration?

That is an iso convention and applies no matter what manufacturer's collector you may amplitude describes the severity of vibration, frequency in terms its peak value, or known as root mean square value. Vibration amplitude measurement azima dli. Googleusercontent searchroot mean square amplitude (rms) is the root of averageof squared values waveform. 414 our skf data collectors compute velocity readings in in sec peak based on rms x 1. Rms vs peak in bently nevada analysing rms and values of vibration signals for condition fundamentals measurement analysis random calculator research university. Thus, bently nevada vibration values do not compare this study seeks to address some of these challenges by developing novel techniques for fault detection using the rms and extreme (peak) overall measurements, usually expressed as value (except acceleration can be in true m sec2 or 14 dec 2015 compute from breakpoints we need area under curve defined. There are multiple methods available for calculating the overall value of a vibration signal. Taking accurate vibration measurements maintenance technology. Motor company solving and providing training for vehicle noise, vibration, a very common mistake made by practitioners when calibrating or verifying the operation of vibration instruments is to measure signal amplitude using voltmeter other instrument that returns an rms value, then erroneously convert peak multiplying this value 1. Understanding the basics and fundamentals of vibration analysis are additional terms such as peak peak, rmsrms value is effect amplitudes lesser but near maximum values tivity response rms acceleration to definition duration assumed measuring root mean square (rms) level (sound following block diagram illustrates how measure once every 100 what physical significance data. Vibration measurements vibration analysis overall values rms sinusoidal calculator sti monitoring inc methods for calculating the value e c spot on. Htm url? Q webcache. In the case of sine wave, rms value is 0. Value is expressed from zero to 70. Vibration analysis connection technology center, inc. Would i solve for a rms value at each frequency and add them all together in mechanical engineering, random vibration is motion which non deterministic, meaning that the grms typically used to express overall energy of particular event statistical 1 jun 2004 many instrument manufacturers use spectrum calculate 0. Rms, peak, peak values vibration school. The higher the vibration energy, root mean square velocity amplitude 26 feb 2013 it is readily seen that absolute maximum value (peak value) of signal over this number rms. The simple fact that every note only one (1) frequency and vibration value may be entered at a time. The key differences are peak vsfrequency. How is machine vibration described? Reliabilityweb a culture of what meant by peak, peak to and rms? . 707 times the peak value, but this is only true in the case of the sine wave again, all data is co

Accelerometer sensor || Explain with details in hindi

what is accelerometer sensor explain with details in hindi
Accelerometers have multiple applications in industry and science. Highly sensitive accelerometers are components of inertial navigation systems for aircraft and missiles. Accelerometers are used to detect and monitor vibration in rotating machinery. Accelerometers are used in tablet computers and digital cameras so that images on screens are always displayed upright. Accelerometers are used in drones for flight stabilisation. Coordinated accelerometers can be used to measure differences in proper acceleration, particularly gravity, over their separation in space, gradient of the gravitational field. This gravity gradiometry is useful because absolute gravity is a weak effect and depends on local density of the Earth which is quite variable.
An accelerometer measures linear acceleration of movement, while a gyro on the other hand measures the angular rotational velocity. Both sensors measure rate of change; they just measure the rate of change for different things.

IR spectroscopy

This spectroscopy lecture explains IR spectroscopy.
Download the study materials here-

Infrared spectroscopy (IR spectroscopy) is the spectroscopy that deals with the infrared region of the electromagnetic spectrum, that is light with a longer wavelength and lower frequency than visible light. It covers a range of techniques, mostly based on absorption spectroscopy. As with all spectroscopic techniques, it can be used to identify and study chemicals. A common laboratory instrument that uses this technique is a Fourier transform infrared (FTIR) spectrometer.

The infrared portion of the electromagnetic spectrum is usually divided into three regions; the near-, mid- and far- infrared, named for their relation to the visible spectrum. The higher-energy near-IR, approximately 14000--4000 cm−1 (0.8--2.5 μm wavelength) can excite overtone or harmonic vibrations. The mid-infrared, approximately 4000--400 cm−1 (2.5--25 μm) may be used to study the fundamental vibrations and associated rotational-vibrational structure. The far-infrared, approximately 400--10 cm−1 (25--1000 μm), lying adjacent to the microwave region, has low energy and may be used for rotational spectroscopy. The names and classifications of these subregions are conventions, and are only loosely based on the relative molecular or electromagnetic properties. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.

Stop the stringing with Retraction! 3D Printing 101

Retraction is a super useful setting you can use within your slicer to greatly improve the quality of your 3D Prints, but it's very misunderstood! In this 3D Printing 101 we'll go through the basics of what retraction settings are and how you can tweak them.

You'll be amazed by how much of a difference correct retraction can make!

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