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Join Date: Jul 2017
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Kelvin Double Bridge for Resistance Measurement

07/16/2017 12:29 AM

Dear All,

1)How to do the kelvin double bridge zero setting before start the resistance measurement of the copper cable?

2)In double bridge there is two knobs called initial and final ,what is the role of these two knobs?

3)In spot reflecting galvanometer head area there is mentioned clamp and free as well as side area D,1/0.1,1/1,1/100,1/1000 all these readings available,please let me know these things for doing this measurement.

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#1

Re: Kelvin double bridge for resistance measurement

07/16/2017 2:37 AM

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#2
In reply to #1

Re: Kelvin double bridge for resistance measurement

07/17/2017 1:11 AM

Nice reply, and the video may well answer the OP's question, but I was quite a few seconds into watching the video before I discovered that the speaker was attempting to speak English!

I have considerable difficulty understanding people speaking English with accents very different from that of the western US. My hearing is far from perfect, so perhaps others can understand what this guy is saying, but I treated this the about the same way I treat most help desks from India: I tell them I don't understand, and hang up.

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#3
In reply to #2

Re: Kelvin double bridge for resistance measurement

07/17/2017 6:33 AM

Yes, it was a difficult accent, but I was getting the hang of it after a few minutes.

I have tried to understand people affected with Cerebral Palsy, and Oz TV brings us plenty of UK and US accents, so it isn't too hard after a while to tune in. No harder than receiving Morse Code. Just have to stay in practice.

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#7
In reply to #2

Re: Kelvin double bridge for resistance measurement

07/18/2017 1:40 AM

Well hopefully this isn't too hard to understand, pretty basic stuff...you really only need to understand about half of what he's saying to get the gist...It's basically just to isolate your ohmic load, to get a precise reading...

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#4

Re: Kelvin Double Bridge for Resistance Measurement

07/17/2017 9:51 AM

Decades had past since I got involved....

The very low ohmic testing is accomplished by pumping small current into the DUT

The test requires the use of testing probes with two paralleled cables /wires terminated in each probe using heavy duty alligator clips ...

These testing probes need to be zeroed first together to negate any resistance that may affect the measurements..

The two initial /final knobs may be intended for the "coarse" and "fine" tuning adjustments of the probes prior to actual testing? It is intended to "Null" your test jig..

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#5

Re: Kelvin Double Bridge for Resistance Measurement

07/17/2017 11:38 AM

All these questions can be answered using the original equipment manufacturer's User Instructions leaflet. If it is not to hand, a simple telephone call to its helpline will precipitate a replacement.

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#6
In reply to #5

Re: Kelvin Double Bridge for Resistance Measurement

07/17/2017 1:43 PM

The only thing better is one of those new-fangled telephone thing-a-ma-jigs that spits out the instruction leaflet when the OEM calls it.

I believe this new thing is called a facsimile machine.

But be warned, if you want a banana, and it spits out a picture of one, you still cannot eat it. It takes a really new thing called 3D printer with banana starch and banana oil to print out a banana.

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