Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [measurement]

Measurement is the assignment of numbers to objects or events. All measurements consist of three parts: magnitude, dimensions (units) and uncertainty.

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What does pitch means in the context of the sizing of a breadboard?

I am trying to build an eagle-cad part for an Arduino Micro. (so I can make a PCB and stick the arduino on it) I was hoping to derive the distance between the two rails of pins from the fact that on a 2.54 mm pitch breadboard, there are 5 holes in…
azani
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How to make single ended voltage measurements

I’m in the process of setting up a test rig to automatically measure and test induced PCB voltages. The device I’m using (we’ll call it the meter) makes single ended measurements. The PCB output drives a 24V volt fan via two pins (which I assume are…
user11623
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How are new 'best performance in the world' devices measured?

Say you build an ADC or a DAC (or a scope/spectrum analyser) that has the best performance in the world. With what exactly do you test it with? I'm guessing: Build the best ADC. You'll get digital numbers that you can collect, then run them through…
Marty
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What is Noise Temperature?

Here's a good question for the professional electronic engineers of Chiphacker: What is noise temperature, and how is it used in designing receiving systems as a whole? (I've seen it specified for the Arecibo telescope antenna, for example.) I've…
Jesse
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How do I measure CO and CO2 concentration in a gas?

I'm looking for a document with a description of a method to measure CO and CO2 concentration on a gas. I found some information about how to do it with infra red absorption, but not enough information to run a test. I also saw something using a…
Andre Oliveira
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Schrödinger and electrical measurement issue

During the 19's, Schrödinger state that it is impossible to make a measurement without disturbing a system. To illustrate his statement, he made the famous experiment of the cat and the box. Poor cat btw.. This is also true in electronic nowadays. A…
M.Ferru
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Accuracy class 0.5 (0.25 USA)

I have a 50 Amp current shunt, Tyco, specified as "Accuracy class: 0.5 (0.25 USA)" What does 0.25 (USA) mean? Is it somehow equivilant to class 0.5 ISO, or does it mean something else? I'm not in the USA or Canada, and our supplier doesn't know…
david
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Is there a device to measure distance to a live wire through bone-like material?

Is there any electronic device that can measure the distance from a point in space to a wire with very low voltage running through it? The measurement of concern would be approx. 3 to 5mm . Its application would require the measurement to be made…
Gregg Stein
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MCP3909 Energy metering IC , How to use the HFOUT in it?

I'm using the Microchip MCP3909 Energy metering IC, How to use the HFOUT in it ? note: HFout supplies a frequency output proportional to the average active real power . This frequency should be sent to the meter on HFOUT pin which access a…
xsari3x
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Measuring tension force on rope

Suppose I want wo measure how strong someone (or somthing) pulls on a rope, i.e. I want to measure the tension (=dragging) force on the rope. The pulling would come from only one direction. I assume a maximum force of let´s say about 1000N (could be…
Junius
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Strategies for measuring physical PCB dimensions

Are there any low-cost and accurate ways to measure small dimensions on a physical PCB? Physical is critical here, since it's easy to measure dimensions in a CAD tool. However, actual dimensions will diverge somewhat from the design dimensions due…
MattHusz
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How do you know that an oscilloscope is displaying the actual waveform?

As oscilloscopes get faster and faster, when designing a new scope how do you know that what it's displaying is the same as the actual waveform? For the fastest scopes, you don't have something faster that you can use to verify that the measurement…
crj11
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How to measure acidity of a breath condensate?

Is there any way to measure an acidity of a breath condensate? That is to measure a pH of an exhaled breath condensate. I would like to use such a sensor to daily measure my acid level in a breath condensate and correlate it with heartburn attacks…
Datageek
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Measuring components of current

When measuring input current to a primary winding of a transformer with an inline true RMS multimeter, can no-load current be measured, then full load current be measured, and then simply subtract no-load current from full load current to leave the…
Steven Carr
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Definition of Full-scale error

I was looking for the concept of "Full-scale error" (related with laboratory measurement terminology) on the web without success. I would appreciate your help.
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