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Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Antonio wrote ...
How did you connect both probes to measure the AC input and the full-wave rectified output? If you are using a diode bridge (4 diodes), this is not possible, as the ground is not the same. A capacitor that heats up quickly? Very strange, as capacitors normally don't dissipate significant energy. Possibly a wrong connection or insufficient voltage rating. Are the red buttons in the "cal" (calibrated) position?
I connected the channel A to AC wires, and channel B to + and - on the rectified.
I didn't have a capacitor with high enough capacitance at that voltage level, only worked for my old 12Vdc supply, so yes, its just underrated.
Calibration buttons for channel A and B are in the calibrated position
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
MadsKaizer wrote ...
I connected the channel A to AC wires, and channel B to + and - on the rectified.
Both channels have the same ground. If you connect the ground leads of the probes to different points, you short-circuit the points. In a full-wave bridge, the connection short-circuits the AC signal trough one of the diodes (this may damage something...).
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I have found the fault on my scope that was giving me all this trouble, it was a capacitor on the channel B board that was damaged from being pushed into another solderpoint, after some minor repair its working like a charm and I can now get all kinds of different signals without noise or mixed signals :)
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
I don't think it's ferrite because apparently ferrite doesn't like DC. I think it's iron powder but I'm not exactly sure. I know that the ones from ATX power supplies (the yellow ones) work well. I have found one that is blueish-green that also works well that is from an ATX power supply.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Ferrite most likely works as well, there has been some discussion on that if there is no gap in the series inductor (=very big inductance), saturation might not matter at all as it will still provide more or less constant current.
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ZVS flyback troubles
