FLUKE 8060A Guitar Tuning Interface

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Joined: Wed Mar 03, 2004 1:01 am

FLUKE 8060A Guitar Tuning Interface

Post by johnusa » Wed Mar 03, 2004 6:05 pm

Newbie here would like to know if anyone would know how to interface a guitar to a Fluke 8060A VOM with frequency meter to allow for tuning the guitar? The Fluke appears to be extremely accurate and thought it might work as a tuner.<p>Thanks in advance for any help or constructive criticism.

Dean Huster
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Re: FLUKE 8060A Guitar Tuning Interface

Post by Dean Huster » Wed Mar 03, 2004 6:52 pm

Feed the output of the guitar pickup direcly into a comparator circuit configured for a high gain, such as 50 to 100 with a zero-crossing reference. The output of the comparator goes to the input of the DMM. Should work. Remember that the gating of the counter circuitry coupled with the diminishing amplitude of the guitar strings, especially on the higher notes, will mean that you can't read the frequency immediately, but must wait for a full DMM gate cycle. Your DMM may read for only a few seconds before the pickup amplitued dies to too low a value to trip the comparator.<p>OR<p>more easily, you should be able to connect the DMM directly to the speaker terminals of the amplifier and work fairly well as long as the amplitude is high enough. This could mean that you'd be really annoying while tuning the guitar.<p>NOW<p>if this is an acoustic guitar with no pickup, you'll either have to install a pickup or a contact microphone to get a signal. Some of the older contact microphones were of the crystal variety and high-impedance and would probably connect directly to the DMM with no amplification needed. A newer magnetic or electret contact mic would need an amplifier such as the comparator originally described.<p>Frequencies: If you don't have the standard frequencies needed, let me know. I have the entire list for a 32-foot pipe organ. You can mathematically derive all the notes from A440, remembering that octaves are multiples of two.<p>Dean<p>[ March 03, 2004: Message edited by: Dean Huster ]</p>
Dean Huster, Electronics Curmudgeon
Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).


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