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Basic Oscilloscope Operation Question

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FenderBender:
Yes this is an amateur question-

I have a Tek 465M. I wanted to view the output of my bridge rectifier circuit. I had it set on 50ms/Div and 20V/Div, but I get a flat line.

Meanwhile, if I hook it up to my function generator with the probe, all looks good.

I hooked up the ground lead to - side of the rectifier and the probe to the + side.

My DMM does show that the bridge is working.

Am I doing something wrong? I tried to put a 200ohm resistor on the output to act as a load. But I still get a relatively flat line

Tried changing coupling, trigger level etc.

Is there a reason why I get no signal on the CRT?

Thanks.

joelby:
Do you have ripple filtering capacitors? At 20 V/div, you probably won't see much ripple, so the output voltage will be DC, which will be a flat line. However the flat line shouldn't be at ground unless you have AC coupling set.

IanB:
What's the voltage of the flat line?

BravoV:
Make sure you've set the scope input coupling at AC and slowly adjust the vertical resolution.

FenderBender:

--- Quote from: IanB on February 06, 2012, 01:28:02 am ---What's the voltage of the flat line?

--- End quote ---

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