Transformer Turns Question

Chris · 2016-02-15T00:05:06+00:00

Hi guys, I need to count the number of turns of wire on this relay core I have. Trouble is, there are way too many to do so manually. The DC resistance is over 500 ohms and the wire gauge is *very* tiny; there must be a couple of thousand turns at least. I've thought of an ingenious way of counting them and I'd like to know if it will work in practice. What I plan to do is wind say 10 turns of wire around the outside of this core, which is effectively just a solenoid of course. Then I feed this outer winding with say - for example - 10mV of AC at say 10kHz. I determine the voltage output level from the 'secondary' with an oscilloscope. From the ratio of p-p input voltage to p-p output voltage I can calculate the unknown number of turns on the core solenoid from the knowns: the input & output voltages and the primary no. of turns. What do you think? Will this work in practice?

Feb 15, 2016 20 Replies

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Jan Panteltje 10 years ago

On a sunny day (Tue, 16 Feb 2016 07:41:00 -0800 (PST)) it happened snipped-for-privacy@yahoo.com wrote in :

If you put AC on the big turns, and use 1 (one) turn and a scope to measure, you should be OK too. And remember 2 * sqrt(2) for that pp voltage.

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Transformer Turns Question

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