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Originally posted by Ford MX Racer36:
I bought a 100w 4ohm dummy load resistor because someone said that my amp is dead so my question is how exactly do you work this. I was told to hook up your pos to one wire and neg to the other wire and put your dmm on it and read voltage and do some math and it tells you if your amp is putting out and you can compare it to output ratings. But when I put the dmm on acv and hook it up to the resistor and read the voltage, it reads the same as without the resistor. I am totaly comfused on how to work this . Any help would be appreciated. Thanks Ryan

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does it read 0

without the resistor in place and a test signal going too the amp and the amp on take a reading across the + and - terminals bridged with the dmm on ac voltage you should read between 50 and 80 volts depending on the type of amp you have

now leave the - of the dmm attached to the - of the bridged output of the amp then attach one of the terminals of the resistor to the pos terminal bridged output of the amp and then attach the + terminal of the dmm to the other lead of the resistor you should get a voltage value a little lower than that of the first test

then too check and see if you are outputing current turn the dmm to ac current you may also have too change your leads at the dmm to comply with doing a load test and depending on what your amp is rated at you should be getting at least that current and if not you may have a component failure now remember how too get watts from voltage x current

the output voltage (v) times the out put current amps (A) = watts (w)

v x a = w

and the only way too really check clipping is with an osi scope

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Posts: 1843 | From: flagstaff arizona | Registered: Jan 2003  |  IP: Logged |