There are many different "standard" ballasts and lacking experience and not knowing if you are measuring starting voltage or filament voltage, I do not know the common answer. The answer would be available from your ballast manufacturer.
Now stating that, Lithonia offers "Fluorescent Ballast Testing" information in the back of their catalog which includes how to test and meter settings. The information appears to be fairly comprehensive.
Remember to wear proper PPE while doing this and take precautions (it would not be in your best interest to fall off a ladder).
Goodluck,
Shane
