nmoore6676 said:
This is a stupid question that I'm sure they've dealt with. But here goes, what keeps a holder of the PPM from parking the unit in a closet with a radio tuned to whatever station they want to promote?
The PPM has a motion detector. The patterns of motion determine if the detections are counted.
As I understand it the device registers inaudible markers transmitted with the programming so that the unit identifies which station is tuned on a receiver near the gadget. Is it more sophisticated than that as to detecting a person (or persons) also being in proximity?
Motion determines if the meter is in-tab for each day. No motion, it does not count.
Also does it register multiple listeners and count them or just the person to whom it is registered?
One meter, one person. But all the people in a household must participate. There are no partial households.
I know it is stupid but I've never read any technical specs on them. I'm trusting that there are smarter people than me, in fact for the sake of the world I hope that they are out there somewhere.
Go to
www.arbitron.com and click the PPM button on the left. There is plenty of material about the meter.