Thanks a lot, E150GT! That was a really good thread. No need to buy a duty cycle meter. I'm going to use my analog Volt-Ohmmeter, and then convert the average voltage reading to a duty cycle figure by using the formula in the thread. I like an analog meter much better than a digital one for measuring the average value of square waves. Of course, meter damping is a factor, but generally it's much more accurate to use an analog meter for measuring the average value of square waves than trying to take a mental average of the two voltages that a digital meter would flash at you.