« on: August 12, 2013, 12:45:45 PM »
calibration depends on the model of the meter.
i have the sekonic L508 and to calibrate it i have to hit both ISO buttons at the same time (it has two to keep track of different film stocks or to quickly figure out polaroid vs film exposure). once both buttons are depressed the screen shows the exposure compensation scale and i can dial in the exposure by 1/10th of a stop.
i used to have it calibrated using polaroids to figure out what a decent exposure was. you could use your camera to spot meter a grey card and use that for calibration or you could just shoot a picture in good light, adjust camera settings until you like the exposure, and then adjust your meter based on how far off its readings are.
you will have to refer to your manual on how to do it on your meter though.