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Old 10th January 2006, 06:03 PM   #1
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Default Hatfield Herts UK Inductance meter

I don't have one,
We don't have one at work,
The guys in the design house next door don't have one.
My subcontractors don't have one,
I only want it once. (ok maybe twice).

Could anyone measure a coil for me please?
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Old 10th January 2006, 11:37 PM   #2
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I do not know how exact this coil measurement must be.

Unless you need it amazingly accurate, you can measure a coil yourself using a simple multimeter, analog or digital. Such multimeters are available quite cheaply, going as far down as $10 here-probably not much more there.

You would need the use of a signal generator.

Here is an excellent online signal generator.

http://www.satsignal.net/ Audio Tools =>Sweepgen
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Old 10th January 2006, 11:46 PM   #3
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If you're still coming down to Chatham I'll measure it for you.
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Old 11th January 2006, 01:01 AM   #4
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you can do this with one dual-opamp:

The sound card impedance tester
The LMS test set uses a dual opamp to compare the voltage drop across an unknown impedance and an acurately known resistor. It is remarkably simple.

You can test inductors, capacitors, transformers, negative impedances, etc.

A PDF of the QEX article is available at www.arrl.org/qex/2005/Steber.pdf

the code can be downloaded at
http://www.arrl.org/files/qst-binaries/
just look about 1/3 down the page
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Old 11th January 2006, 08:33 AM   #5
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Al, I get down that way about once a fortnight. If I don't get any joy in the next 2 weeks I'll deffinatly take up your offer. The gig I was going to was cancelled because the guitarist broke his arm. There will be others sometime though.

Thanks to the other guys. I don't really want to get into special projects for this. I'd probably need to borrow a meter to varify the calibration anyway!

One of my suppliers has a huge flying probe PCB test machine. I might call in that favour.
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Old 11th January 2006, 09:47 AM   #6
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I have an old Marconi Instruments RLC bridge TF2700 you could use. I'm located in Leighton Buzzard, Beds.
Send me an email if you are interested.
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