New to the forums and hoping this is the right place to discuss this.
Here’s the scenario... we have a dynamometer with a DC output voltage that’s adjustable, anywhere from 90 volts to 400 volts. This comes off of a full wave rectifier at 120 hz. At our 90 volts DC, we are still seeing 45ish volts AC, and this number rises as the DC output is increased.
There’s a lollipop style capacitor after the rectifier, I believe the rating was 1-2 Nano farads. It measures ok on a multi meter, but obviously isn’t filtering the circuit as it should.
We hooked up the circuit to an oscilloscope and it appears to be getting rectified as it should. Any suggestions on what might be happening? Any suggestions on how to properly size a capacitor for this scenario?
Thank you for any insight provided.
Here’s the scenario... we have a dynamometer with a DC output voltage that’s adjustable, anywhere from 90 volts to 400 volts. This comes off of a full wave rectifier at 120 hz. At our 90 volts DC, we are still seeing 45ish volts AC, and this number rises as the DC output is increased.
There’s a lollipop style capacitor after the rectifier, I believe the rating was 1-2 Nano farads. It measures ok on a multi meter, but obviously isn’t filtering the circuit as it should.
We hooked up the circuit to an oscilloscope and it appears to be getting rectified as it should. Any suggestions on what might be happening? Any suggestions on how to properly size a capacitor for this scenario?
Thank you for any insight provided.