Tune the first fret notes by adjusting string tensions and compare the second to twelfth fret notes of a string with the chromatic electronic tuner pitches.If it is perfect you are done with that string. Play some songs on one string and adjust the string length at the bridge accordingly if the intonation does not work well. If the fifth fret note is still a little sharp (high), move the bridge (bridge saddle) back a third of a millimeter. Tune the open string note and check the fifth fret note with a mechanical pitch pipe.If the 12th fret note isn't perfectly in tune while the open note is perfectly in tune, you need to repeat step 4 until it is. You should see that it is not in the same place anymore. Once you have completed step 2 again, re-fret the 12th fret on the string you just made the adjustment on and check it on the tuner.Make sure the entire instrument is still perfectly in tune. After you make a saddle adjustment, you will need to repeat step 2. If the distances y i between strings and frets are too large, intonation tuning will be impossible.Ĭheck it. Need to keep y i small as possible for first string to achieve intonation tuning.From these equations can tell that intonation tuning improves as string tension T reduces and distance y i between string and twelfth fret reduces with offsets d minimized. The intonation tuning error due to string stretching is ( T 2+(T (2 y i/ s)) 2) 1/2- T, where T is the open string tension of the ith string, and y i is the distance between the side of the ith string and the twelfth fret peak. The more expensive guitars can have their strings closer to the fretboard and so have better intonation tuning. There may be some string buzzing permitted at frets higher than twelfth fret. Place the strings as close as possible to the frets if some buzzing on next higher fret can be heard increase the distance slightly.The closer the string(s) to the frets, the less the string stretching and tension increase when pressed, the smaller the offsets d have to be, the significantly (exponentially) better the intonation tuning due to less string stretching, but string buzzing may perhaps sometimes reduce intonation tuning. The better quality guitars can have their strings closer to the frets with less buzzing.If you do alter your action on any string, repeat step 2. If you alter your action after you complete the intonation setting process, you may undo all of the work you are about to do. The smaller the magnitude and duration of the buzzing on adjacent frets the smaller the offsets d has to be. ![]() The buzzing sometimes produce some harmonic pitches that can reduce the purity of the pitches of the higher pitch frets the tenth fret note pitches can sound a little higher. The two pitches may briefly and temporarily blend making sometimes the note pitch a little sharp. This means if the string is buzzing raise it so that it does not! When the string is vibrating or buzzing on the next higher pitch fret, the note pitch can quickly and temporarily switch making intonation tuning very difficult. If you have any desire to raise or lower your string action (the distance between your strings and the fretboard) you should do it now. When you're tuned, move on to the next step.Īdjust your action. Stick with this step until every string is open tuned as close as possible to perfect. As the tension on each string changes it may alter the way your neck is sitting and may detune your other strings.
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