## What Are AC and DC Coupling?

This is an important subject to understand when working in the signal processing field. In terms of AC and DC Coupling, what is Coupling? Quite simply, coupling is the transfer of energy from one medium to another, for example, from…

## 5 Videos That Explain Resonance

One of our most popular articles here on the Noise & Vibration Measurement Blog is What Is Resonance? by James Wren. Since this is such an important concept in noise & vibration measurement we thought we’d see what videos we…

## Vibration : Measure Acceleration, Velocity or Displacement?

When using vibration data, especially in conjunction with modelling systems, the measured data is often needed as an acceleration, as a velocity and as a displacement. Sometimes different analysis groups require the measured signals in a different form. Clearly, it is impractical to measure all three at once even if we could. Physically it is nigh on impossible to put three different types of transducer in the same place.

## How To Analyze Noise & Vibration In Rotating Machines

In this article we will look at the basic steps needed to measure noise & vibration in rotating machines. We won’t look in great detail at some of the techniques involved – we deal with these elsewhere on the blog. This material…

## What Is The Difference Between Single Ended & Differential Inputs?

Prosig P8000 systems use differential inputs, but what are they and why are they so special? This subject is not always fully understood and, therefore, the focus of this article is to try to make the difference clearer and explain…

## Converting Acceleration, Velocity & Displacement

From time to time I meet engineers who are interested in the conversions between acceleration, velocity and displacement. Often, they have measured acceleration, but are interested in displacement or vice versa. Equally, velocity is often used to find acceleration. This article outlines the nature of the conversion between these units and will suggest the preferred method for doing so. .

## 10 Sites That Every Engineer Should Know About

Here’s another post inspired by an office discussion. We were discussing our favourite engineering based websites and realised the results would make a great blog post. So after a rummage through our bookmarks and a little further debate we’ve come…

## A Simple Frequency Response Function

The following article will attempt to explain the basic theory of the frequency response function. This basic theory will then be used to calculate the frequency response function between two points on a structure using an accelerometer to measure the…

## What Are dB, Noise Floor & Dynamic Range?

Most engineers are probably familiar with or have come across the decibel or dB as a unit of measurement. Its most common use is in the field of acoustics where it is used to quantify sound levels. However, as will…

## What Is Resonance?

We hear the word used a lot, but what is resonance? First, in order to explain we have to explain the terms we will use. A period is the amount of time it takes to complete one cycle The number…

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