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Meter bridge experiment

by Hardik Batra
Tags: bridge, experiment, meter
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Hardik Batra
#1
Jun19-14, 10:01 AM
P: 82
why the meter bridge experiment not useful for the measurement of small resistance?
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jtbell
#2
Jun19-14, 10:19 AM
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Quote Quote by Hardik Batra View Post
why the meter bridge experiment
I assume you mean what people (in the US at least) usually call a "Wheatstone bridge", rather than the kind of meter bridge that is used in an audio recording studio:

http://www.sweetwater.com/c434--Mixer_Meter_Bridges

Before reading your post, I had never seen a Wheatstone bridge referred to as a "meter bridge", but a Google search revealed that in some places it does indeed have that name. I've learned something new today!

not useful for the measurement of small resistance?
Small compared to what?
Hardik Batra
#3
Jun19-14, 10:29 AM
P: 82
[QUOTE=Hardik Batra;4778031]
Quote Quote by jtbell View Post
I assume you mean what people (in the US at least) usually call a "Wheatstone bridge", rather than the kind of meter bridge that is used in an audio recording studio:

http://www.sweetwater.com/c434--Mixer_Meter_Bridges

Before reading your post, I had never seen a Wheatstone bridge referred to as a "meter bridge", but a Google search revealed that in some places it does indeed have that name. I've learned something new today!
Ok. I mean wheat stone bridge.

I don't know the limit of small resistance.

UltrafastPED
#4
Jun19-14, 11:05 AM
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Meter bridge experiment

Techniques that work are discussed in detail here:
http://www.keithley.com/data?asset=53682
sophiecentaur
#5
Jun19-14, 02:16 PM
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Quote Quote by jtbell View Post
I assume you mean what people (in the US at least) usually call a "Wheatstone bridge", rather than the kind of meter bridge that is used in an audio recording studio:

http://www.sweetwater.com/c434--Mixer_Meter_Bridges

Before reading your post, I had never seen a Wheatstone bridge referred to as a "meter bridge", but a Google search revealed that in some places it does indeed have that name. I've learned something new today!



Small compared to what?
On the senior side of the pond, we spell it Metre when we mean the length and Meter when we mean the measuring instrument. There's no confusion that way.
Most Bridges don't use anything as crude as a length of resistance wire, these days, of course.
Btw, actually how long is the wire that you use in the bridge that consists of a wooden board, brass terminals and an old fashioned galvanometer?
jtbell
#6
Jun19-14, 02:32 PM
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The one that we use in our introductory lab apparatus is in fact one meter (metre) long, mounted on top of a meter stick! (which is in turn mounted along with electrical terminals on top of a board)
sophiecentaur
#7
Jun20-14, 05:35 AM
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Quote Quote by jtbell View Post
The one that we use in our introductory lab apparatus is in fact one meter (metre) long, mounted on top of a meter stick! (which is in turn mounted along with electrical terminals on top of a board)
I was visualising a stick with 36 major (inch) divisions on it, with 16 small ones between each pair. :big grin: Good for training in Arithmetic!!


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