By adjusting the height of the bridge you can increase or decrease the distance of the strings from the fretboard. When adjusting the bridge to affect the action it is important the find the medium between low string action and notes that do not produce a buzzing sound. Using your peterson strobe tuner, be sure to re-tune your instrument after making an adjustment. It is often recommended that you lay the instrument on a table or workbench when you are adjusting the bridge intonation on your guitar or bass. Another recommendation is to actually hold the instrument as if you were playing it.
Strings are so sensitive that intonation can vary when a guitar is vertical or horizontal.
First, tune the guitar in standard tuning using a peterson strobe tuner. Starting with the 1st string play the 12th fret harmonic and check the pitch on the strobe-disc display. Next, play the note on the 12th fret and compare the pitch to that of the 12th fret harmonic. The two notes should be exactly the same. If the fretted note is sharper than the harmonic, the string length from the 12th fret to the bridge is not long enough.