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Pickup ohm Reading Inconsistent
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chuckergtrs



Joined: 30 Dec 2004
Posts: 1029
Location: Wichita, KS

PostPosted: Sun Apr 24, 2016 12:56 pm    Post subject: Pickup ohm Reading Inconsistent Reply with quote

So I build and wound my second homemade pickup recently. Got it wired up and it was reading a steady 7.70k on the meter for weeks. Hooked it up to the meter last night and it couldn't find a solid number to land on, kept jumping around. Got worried so I hooked it to an amp and it's putting out sound just fine (it's not in the guitar yet.) Hooked a Fender pickup to the meter and it read a solid number. What would be causing my pickup to not find a single number and should I be concerned. It's still putting out sound just fine.

Still learning pickup building, so thanks for an tips or knowledge you can provide.

Chucker
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statorvane



Joined: 21 Aug 2003
Posts: 1950
Location: Upstate New York

PostPosted: Mon Apr 25, 2016 12:49 am    Post subject: Reply with quote

Was the pickup installed in the guitar when you noticed this? Maybe the capacitor charging up in your tone circuit.
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chuckergtrs



Joined: 30 Dec 2004
Posts: 1029
Location: Wichita, KS

PostPosted: Mon Apr 25, 2016 5:35 am    Post subject: Reply with quote

No, it has not been installed into the guitar yet. I did notice when I pressed on the cloth tape a little bit that it read more consistent. So, I wrapped another layer of tape tightly around the coil and it seems to be reading better so far.

Chucker
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tangelolemon



Joined: 26 Jan 2009
Posts: 2691
Location: Brooklyn, NY

PostPosted: Mon Apr 25, 2016 6:56 am    Post subject: Reply with quote

hmm... that makes me wonder if something might be amiss with the coil, like there might be a short or even a break in it?

Applying pressure to the coil changing its behavior isn't a good sign, to me.

If this is for your own personal guitar, I'd put it in, rock it for awhile, and see how it goes. If it's for a customer's guitar, I might be tempted to re-wind.
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BrightKJ



Joined: 13 Sep 2008
Posts: 342
Location: Midlothian, VA

PostPosted: Mon Apr 25, 2016 6:58 am    Post subject: Reply with quote

If your ohm meter is doing anything other than giving you a solid reading, it means you do not have continuity, which indicates an open circuit or a wire making inconsistent contact. A more likely suspect could also be a cold solder joint, so I would consider refloating all your terminations before doing anything else.
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chuckergtrs



Joined: 30 Dec 2004
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Location: Wichita, KS

PostPosted: Mon Apr 25, 2016 8:04 am    Post subject: Reply with quote

Thanks guys. The solder connections are shiny and clean, so I don't think there is any problem there. It's still reading steady this morning so I will keep an eye on it for a while, but will probably start building another pickup just as backup, as I do plan to put this one up for sale at some point.

Chucker
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Kregg



Joined: 22 Apr 2008
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PostPosted: Mon Apr 25, 2016 6:19 pm    Post subject: Reply with quote

How old are the batteries in the multimeter?
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marksound



Joined: 15 Aug 2005
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Location: OKUSA

PostPosted: Mon Apr 25, 2016 8:05 pm    Post subject: Reply with quote

If it started to behave after a tighter wrap of tape, I'm thinking there's something in the coil. Maybe a loose wind? I don't know--I've never wound a pickup. But electrical stuff is pretty basic. If there's an iffy connection somewhere it won't read right.

Ask Fliski.
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chuckergtrs



Joined: 30 Dec 2004
Posts: 1029
Location: Wichita, KS

PostPosted: Tue Apr 26, 2016 5:32 am    Post subject: Reply with quote

Battery in the meter is good, that was my first thought. It's still reading good now with the tighter wrap, but I have started building another just in case.

Yes, I have consulted Fliski... He is my pickup guru and has educated me well through my studies of pickup building. Laughing

Chucker
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metal god



Joined: 31 May 2015
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PostPosted: Sat Apr 30, 2016 11:41 pm    Post subject: Reply with quote

you no after time that tape will loosen up and it wont work right
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rhardman



Joined: 11 Sep 2008
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PostPosted: Sun May 01, 2016 9:36 pm    Post subject: Reply with quote

did you have alligator clips on the test leads???
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chuckergtrs



Joined: 30 Dec 2004
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Location: Wichita, KS

PostPosted: Mon May 02, 2016 3:04 am    Post subject: Reply with quote

rhardman wrote:
did you have alligator clips on the test leads???


No. But it is still reading steady and good now. I started building a new one to replace this one.

Chucker
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Old Black



Joined: 18 Jan 2006
Posts: 1977
Location: Minneapolis

PostPosted: Mon May 02, 2016 8:56 am    Post subject: Reply with quote

Are the connections from the multimeter grounding or otherwise touching something?

I've had your problem before and it was the above (I had small alligator clips, which you really should get, poorly attached to the multimeter probes).
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chuckergtrs



Joined: 30 Dec 2004
Posts: 1029
Location: Wichita, KS

PostPosted: Tue May 03, 2016 2:57 am    Post subject: Reply with quote

Old Black wrote:
Are the connections from the multimeter grounding or otherwise touching something?

I've had your problem before and it was the above (I had small alligator clips, which you really should get, poorly attached to the multimeter probes).


No, it was a clean connection to the meter. I even tested with a Fender pickup, which was reading just fine. I suspect the problem has to do with a repair I did to the coil wire when it broke about half way through the winding process.

Thanks for all the tips guys, good stuff!

Chucker
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BrightKJ



Joined: 13 Sep 2008
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Location: Midlothian, VA

PostPosted: Tue May 03, 2016 6:57 am    Post subject: Reply with quote

chuckergtrs wrote:
Old Black wrote:
Are the connections from the multimeter grounding or otherwise touching something?

I've had your problem before and it was the above (I had small alligator clips, which you really should get, poorly attached to the multimeter probes).


No, it was a clean connection to the meter. I even tested with a Fender pickup, which was reading just fine. I suspect the problem has to do with a repair I did to the coil wire when it broke about half way through the winding process.

Thanks for all the tips guys, good stuff!

Chucker


Hahaha... it might have helped to lead with that little tidbit of info. It kind of explains everything you were seeing.
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