How does a current Transducer work?

I am using a current transducer LEM HAS200-S . I want to know the internal working principle for it- how does it convert current to voltage?

It is based on the principle of Hall Effect, wiki HALL EFFECT

YES I DO KNOW ABOUT THAT BUT I DO NOT UNDERSTAND THE WIKI HALL EFFECT EXACTLY.. COULD YOU ALSO TELL ME THE CIRCUITRY USED INSIDE THE TRANSDUCER OR ANY RELEVENT LINKS / PDFS ETC

Hope this helps

http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/hall.html

Essentially the right hand rule, when there is drift in the charges it creates an EMF and based on the current flowing through the conductor this EMF varies and based on the material of the conductor a relationship is drawn between voltage o/p and the current through the conductor,

when current flows through a conductor which is placed in a plane perpendicular to a magnetic field the electrons are forced to one side of the conductor creating a potential difference across, the voltage is read out at the hall voltage.

Now the voltage produced is in the order of millivolts and therefore needs to be amplified considerably hence the next stage from here is a amplifier with a dual rail supply to be able to measure positive and negative flow of current

aka as below

Hi Sohil

Flemings Left hand motor rule will also give you a better idea as well as the right hand rule

http://en.wikipedia.org/wiki/Fleming's_left-hand_rule_for_motors


Faraday's Magnetic Field Induction Experiment

http://micro.magnet.fsu.edu/electromag/java/faraday2/

Good page to see how this occurs "make sure you have Java enabled on your browser the applet is very good on this page clearly showing you the relationship btw magnetism and induced voltage current

http://micro.magnet.fsu.edu/electromag/java/faraday2/ In fact you can even build this at home with a magnetized needle and water surrounded by a coil to see the reverse effect of passing a current through an inductor and the magnetic field it produces The converse is true for magnetic field passing through an inductor , inducing the current / voltage it produces

Hope this helps you

MD Harrington

www.harrington.force9.co.uk

Why bother with the LEM at all. Just pass your current through a low ohmic resistor and measure the voltage drop across it. Its simpler, easier and quicker. If you want to understand Hall Effect try this website: http://www.electronics-tutorials.ws/electromagnetism/hall-effect.html , it helped me.

"Why Bother !! " Why bother ??/ hmmmm Interesting topic this

If everyone in the world didn’t Bother then we wouldn’t have the great people who brought us light into our homes, electric into our home's , we wouldn’t have the telephone , or the pstn or a transmitter would we If we didn’t have people that bothered to find out what A hall sensor is or what exactly makes up an electron or what energy can we utilize from the sun

What happens if you don’t BOTHER to find out how a hall sensor works !!

Lets have a look at your speedometer for example or your next assignment which might be detect the number of revolutions showing your equations for how you intend to pulse an led on at 30 degrees 60 degrees and 90 degrees whilst the wheel of a bicycle revolves at 20 revolutions or 60 revolutions per second


Cant use a resistor there you know can you or do you think you might able to do this ??

What about a strobe for the timing of a vehicle or automatic advance of vehicle timing for the combustion engine for example Or the automatic gearbox of a motor vehicle

Use a resistor there would you ?? I don’t think that work very well do you !!

What about the speed that you have to cut a cylindrical shaped peace of steel Why would you have to take into account rev’s per second I mean why bother about this as well then hmmm !! Why even bother to wake up in the morning why not just give in now

Why indeed !! Bother I can think of quite a few reasons why you should BOTHER !!

No i like that one definatley very good that answer

Tell you what we do here Lets all not bother to help or provide people with these answers showing them where to go and look for advice answers and learn something different Lets all not bother Lets not BOTHER to put up WebPages as well as write software produce PCBS, circuits and Lets all not Bother to make life interesting at all !! What a good idea