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Author Topic: Will this Hall Effect sensor work?  (Read 528 times)
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I am building a circuit to calculate power consumption of appliances.  After reading a lot on here, as well as other sites, I decided that I liked the idea of these http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=6668185 Hall effect sensors.  The thing is, I just notice that it says the frequency bandwidth is 100KHz, does that mean they are not going to work at mains voltage frequency (50Hz) or that they are a bit overkill and will work up to 100KHz?

The circuit will be measuring 0 - 20A max, and I like these because there is a little headroom just in case.

thanks
paul..
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Are you in the US? Take a look at Kill-A-Watt, nice mains power measurement. Might even be able to borrow from a library (we borrowed from Sudbury, MA, then bought our own - well, the wife did, I would have made something had I known she was doing that!)
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No I am not, I am in Spain, I do have already a very similar device, but that is not what I am trying to achieve.  This project isn´t for monitoring,  It is more of a control circuit.  I need to know how much power is being consumed in order to carry out other tasks. 
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The thing is, I just notice that it says the frequency bandwidth is 100KHz, does that mean they are not going to work at mains voltage frequency (50Hz) or that they are a bit overkill and will work up to 100KHz?

They will work at 50 Hz. The 100 kHz bandwidth is more of a measure of transient response, that is, how well they will "track" a sharp turn-on or turn-off of current. Have a look at figures 9 and 10 in the datasheet. The "step response" is directly related to the bandwidth and are probably more useful but not as easily quantified by a single number.

Did you notice they are out of stock and not expected until 08/06/11?

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Thanks for that.  That is the answer I was hoping for.  I already bought it, so it doesn´t matter they are out of stock, but thanks for noticing.
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