DC Component measuring

Kiril Kirilov · 20th January 2003, 09:03 AM

Does anybody have an idea, how can be measured DC component in primary winding of PSU transformer? I hope it's possible without expensive equipment?

dhaen · 20th January 2003, 09:29 AM

Kiril,

Check out this thread:

Transformer Hum?! STOP IT!

With a bridge rectifier and capacitor in one side of the mains supply only, you should be able to measure any DC present across the electrolytic capacitor

Cheers,

stefan · 20th January 2003, 09:55 AM

How do you think?
Will this be good?
If you measure positive and negative voltage across resistors difference between them will (may be) equal to DC voltage in AC outlet.

peranders · 20th January 2003, 10:58 AM

I think you guys have misunderstood the question.

The question is how do I measure the DC part in the AC signal? My suggestion is simply to switch the DVM to DC but some (all?) may have some voltage limiting so the reading MAY be wrong. One trick to avoid this is to attach an external LP-filter, 100k plus 1 µF as a start. This filter reduces the AC part of the signal you want to measure.

20th January 2003, 09:03 AM	#1
Kiril Kirilov diyAudio Member Join Date: Jul 2002 Location: Kyustendil, Bulgaria, Europe	DC Component measuring Does anybody have an idea, how can be measured DC component in primary winding of PSU transformer? I hope it's possible without expensive equipment? __________________ I like everything, but mediocrity

20th January 2003, 10:58 AM	#4
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	I think you guys have misunderstood the question. The question is how do I measure the DC part in the AC signal? My suggestion is simply to switch the DVM to DC but some (all?) may have some voltage limiting so the reading MAY be wrong. One trick to avoid this is to attach an external LP-filter, 100k plus 1 µF as a start. This filter reduces the AC part of the signal you want to measure. __________________ /Per-Anders (my first name) or P-A as my friends call me

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20th January 2003, 09:29 AM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Kiril, Check out this thread: Transformer Hum?! STOP IT! With a bridge rectifier and capacitor in one side of the mains supply only, you should be able to measure any DC present across the electrolytic capacitor Cheers,

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