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#1
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Measuring small inductances
Hi all,
I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? Thanks, p. -- The BBC: Licensed at public expense to spread lies. |
#2
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"Paul Burridge" wrote in message
... Hi all, I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? www.google.com |
#3
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"Paul Burridge" wrote in message
... Hi all, I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? www.google.com |
#4
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"Paul Burridge" wrote in message ... Hi all, I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? If you have a signal generator you can connect them to a suitable capacitor and measure the resonant frequency. Leon |
#5
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"Paul Burridge" wrote in message ... Hi all, I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? If you have a signal generator you can connect them to a suitable capacitor and measure the resonant frequency. Leon |
#6
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On Mon, 15 Mar 2004 12:48:43 -0000, Leon Heller wrote:
"Paul Burridge" wrote in message ... Hi all, I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? If you have a signal generator you can connect them to a suitable capacitor and measure the resonant frequency. Leon Nyuk, nyuk, nyuk. I bet if he had a signal generator, he wouldn't be looking for inductors to shotgun that multiplier In fact, he wouln't even be building a multiplier. -- Best Regards, Mike |
#7
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On Mon, 15 Mar 2004 12:48:43 -0000, Leon Heller wrote:
"Paul Burridge" wrote in message ... Hi all, I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? If you have a signal generator you can connect them to a suitable capacitor and measure the resonant frequency. Leon Nyuk, nyuk, nyuk. I bet if he had a signal generator, he wouldn't be looking for inductors to shotgun that multiplier In fact, he wouln't even be building a multiplier. -- Best Regards, Mike |
#8
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On Mon, 15 Mar 2004 12:48:43 -0000, "Leon Heller"
wrote: "Paul Burridge" wrote in message .. . Hi all, I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? If you have a signal generator you can connect them to a suitable capacitor and measure the resonant frequency. Hi Leon, That's what I have been doing, in fact. It's just I'd prefer to have a more convenient, portable method to get instant read-outs of coil values... -- The BBC: Licensed at public expense to spread lies. |
#9
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On Mon, 15 Mar 2004 12:48:43 -0000, "Leon Heller"
wrote: "Paul Burridge" wrote in message .. . Hi all, I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? If you have a signal generator you can connect them to a suitable capacitor and measure the resonant frequency. Hi Leon, That's what I have been doing, in fact. It's just I'd prefer to have a more convenient, portable method to get instant read-outs of coil values... -- The BBC: Licensed at public expense to spread lies. |
#10
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"Bill Turner" wrote in message ... On Mon, 15 Mar 2004 10:46:53 +0000, Paul Burridge wrote: I've got quite a huge stash of inductors in my parts bin. The colour codes don't always seem to relate to the values I've been able to measure, with my multi-function DVM, however, and I can't accurately measure any inductor about 10uH. Is there a circuit anywhere that would enable me to get a reasonably accurate idea of the values I've got down to say 100nH or thereabouts? __________________________________________________ _______ I'd recommend a grid dip meter and a known capacitor, but be sure to make the test at a frequency well below the self resonant frequency of the inductor alone. Another thing to be wary of: Some inductors are wound on a resistor to reduce the Q for a specific purpose. Be suspicious of any which have an unusually broad dip. -- Bill, W6WRT QSLs via LoTW This is what I do; it works well even on my questionable dip meter. Google for "LCR" meter; see what you come up with (mostly high $ instruments, probably). |
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