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The normal PR interval is from 0.12-0.2 seconds and is measured on the EKG from the beginning of the P wave to the beginning of the QRS complex. This interval represents the onset of atrial depolarization to the onset of ventricular depolarization and consists of:
10,299 Views 11 Comments. 1  Hi guys, Is there a proper way of measuring PR, QRS and QT intervals in an EKG strip? 2  11 Comments. Comment. 3  Sep 3, '13. Just remember the small boxes are .04sec and the large are .20sec when measuring use a good set of calipers.  Sep 3, '13.