I am a model railroader. The type of power that i use, called DCC- produces an AC wave that cannot be read accurately with a multi-meter. A website recommended using a full bridge rectifier to change teh wave to a DC wave that the meter can read. I have built the rectifier and it measures both peak and average voltage well -- after adjusting for the loss of V by virtue of the inclusion of a CAP in the circuit. The site also advises that you can use a full bridge rectifier to measure amps. My power supply puts out about 13 V and 3.3 A. I first built a rectifier out of 4 1n4001 diodes but it got hot very fast -- since as it turns out the diodes are only rates at a fraction of an amp. However, I did get a reading near 3.3 A. I then bought a Vishnay full bridge rectifier # KBU4D. When I use it the max amps I can measure is 0.3 amps, even with a very heavy load on the circuit. I though that there might be a cap built into this recitifier but I cannot see one in the spec sheet.
Any advice?
Any advice?