A hamfest or two ago I picked up a couple of inductors because... do I need to spell it out?! Anyway, I like Muirhead and Cambridge Instruments kit.
I checked for continuity but unsurprisingly my cheap component tested didn't bother to measure L. Hence I was dreaming up ways to measure the inductance, but never got around to it.
The, while lazing in the most productive environment known to mankind[1], I finally remembered that I had picked up one of those wretched universal bridges which make you appreciate modern TE: a Marconi TF2700.
The TF2700's spec is +-1%, the 1mH measures 0.99mH (see photo) and the 10*10mH are also all good. Job done, they can be stuffed in the cupboard and left to irritate my daughter when she clears things out.
[1] almost submerged in a hot bath, of course - one of the crowning achievements of civilisation.
Hamfest inductors
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Hamfest inductors
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Re: Hamfest inductors
The TF2700 is a bit clunky but they do work. I haven't used mine in 20 years.
I'm sure when they came out the ads claimed they could measure the inductance of a paper clip.
I'm sure when they came out the ads claimed they could measure the inductance of a paper clip.
Re: Hamfest inductors
Played around with it again last night.
Some 1µH inductors disguised as resistors with a silver band measured 1.1µH. Can't argue with that.
Some relatively chunky 0.75µH inductors measured around 1µH. Conceivably there is a frequency dependence of the core, but I'm unconvinced.
Some 1µH inductors disguised as resistors with a silver band measured 1.1µH. Can't argue with that.
Some relatively chunky 0.75µH inductors measured around 1µH. Conceivably there is a frequency dependence of the core, but I'm unconvinced.