Main advantage of using a Wheatstone bridge

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#1 21672857 29 Nov 2014 05:08

Kevin Tomas Kevin Tomas

Anonymous

Post #1
21672857 29 Nov 2014 05:08

Which is the main advantage of using a Wheatstone brdige (quarter bridge type) for a temperature measurment circuit, so the variable resistor would be a NTC thermistor, instead of a simple one leg circuit, with a resistor in series with the NTC?

Thanks.
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#2 21672858 01 Dec 2014 19:47

Emmanuel Galleto Emmanuel Galleto

Anonymous

Post #2
21672858 01 Dec 2014 19:47

hi Kevin,

I quoted an answer from a site maybe you should check this out.

1.) Using a wheatsone bridge is a differential measurement as opposed to a single ended measurement against an absolute reference.

With the wheatstone bridge several things (potential errors) are canceled out including the bridge excitation, and temperature errors in the 3 "fixed" bridge resistors due to their temperature coefficients (assuming you use resistors with matched or similar coefficients).

2.) If you use a Wheatstone bridge, your measurement can be extremely precise for, or extremely sensitive to, a given change in the thermistor's resistance. If you use a simple voltage divider, it's much more difficult to achieve a similar level of precision or sensitivity for a given thermistor resistance change.

- http://goo.gl/UJsL5M

Hope it helps,
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#3 21672859 05 Dec 2014 04:22

Robert Speer Robert Speer

Anonymous

Post #3
21672859 05 Dec 2014 04:22

If you use a Wheatstone bridge, your measurement can be extremely precise for, or extremely sensitive to, a given change in the thermistor's resistance. If you use a simple voltage divider, it's much more difficult to achieve a similar level of precision or sensitivity for a given thermistor resistance change.

Source(s): http://wirehouse.in
#4 21672860 05 Dec 2014 06:57

Kevin Tomas Kevin Tomas

Anonymous

Post #4
21672860 05 Dec 2014 06:57

Thanks for the reply, that´s exactly the answer I was looking for!
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Main advantage of using a Wheatstone bridge

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