Dummy Loads with the PLWO Tripping the DCP

[jbeckva]

Ahh.. thought you could see 'er in the scope as a lil plateau of sorts.

 

[laatsch55]

Nope.

 

[Gepetto]

Lee make a filter of a 10K resistor in series with about a 0.15uF cap and put this series configuration from one side of your load resistor to the other with the resistor to the positive side of the amp output. Put your scope across the resistor with probe tip to the junction between the resistor and capacitor and the scope probe ground to the other side of the cap (ground)

Run your 1 Khz sine wave test signal through the amp with the load connected. It should give you a flat line output at ground. This is a 100 Hz filter and any DC in the signal should come through as a disturbance off of the ground line.

 

[laatsch55]

Got it done. hooking the AP back up. Hang on.

 

[laatsch55]

So put the fluke to this new ground or put the scope on DC??

 

[laatsch55]

It won't trip at 1KHZ Joe. The lower stuff is where we are having problems.

 

[laatsch55]

Dumb question. Fluke between load positive and the ground to the same place as scope ground.

 

[laatsch55]

Could not get it to trip at 1KHZ. Went down to 130 HZ. Wouldn't trip there either . Wasn't seeing more than 8-9mv DC on the Fluke.Went don to 20 HZ. The fluke was all over the place(below the filter, I know.) and tripped the DC at 70 watts.

 

[Gepetto]

Then make your filter lower Lee, move the filter pole to 10 Hz using a 10K resistor and a 1.5uF cap. Then you can run the amp at 100 Hz and you will get decent averaging. If you want to move the pole lower, say 1Hz then change the capacitor to 15uF.

 

[laatsch55]

Gotcha Joe. Thanks.