DC signal using AC coupling

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adriwii
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Posts: 3
Joined: Sun Sep 10, 2017 10:56 am

DC signal using AC coupling

Post by adriwii » Sun Sep 10, 2017 11:05 am

Hi, i have that problem. When i want to read a AC signal in an audio amplifier with the channel setting AC coupling, the software shows me a DC signal of 20V. In that test point i have much more DC signal than that but it has to be 0Vac, because im not putting a signal in there. Anyone can help me, why the PicoScope or the software are reading like 20Vdc? Thank you very much.
Adrian.

Martyn
Pico Staff Member
Pico Staff Member
Posts: 255
Joined: Thu Aug 11, 2011 7:43 am
Location: Cambridgeshire

Re: DC signal using CA coupling

Post by Martyn » Mon Sep 11, 2017 7:58 am

What PicoScope model do you have ?

Help->About and paste the text from there will give us the info we need to see.
Martyn
Technical Support Manager

adriwii
Newbie
Posts: 3
Joined: Sun Sep 10, 2017 10:56 am

Re: DC signal using CA coupling

Post by adriwii » Mon Sep 11, 2017 9:22 am

Hi, i see that this is not the correct place to put this. This is the automotive section, sorry fot that. Anywhere i have the PicoScope 2000 series and the level zero signal adjusted to 0V. When i measure in AC thats what happend :
https://imgur.com/a/eMocO

(The image size is not the right then i put the url to it).

Thanks a lot.

Martyn
Pico Staff Member
Pico Staff Member
Posts: 255
Joined: Thu Aug 11, 2011 7:43 am
Location: Cambridgeshire

Re: DC signal using CA coupling

Post by Martyn » Mon Sep 11, 2017 9:31 am

Please can you go to Help->About and then copy and paste the text.

A psdata file would also help :)
Martyn
Technical Support Manager

adriwii
Newbie
Posts: 3
Joined: Sun Sep 10, 2017 10:56 am

Re: DC signal using CA coupling

Post by adriwii » Mon Sep 11, 2017 9:44 am

PicoScope® 6 - Software de Osciloscopio para PC versión: 6.12.7.2687
Copyright © 1995-2017, Pico Technology Ltd.

Modelo: PicoScope 2205A
Número de serie: EO191/570
Versión USB: 2,0
Fecha de calibración: lunes, 20 de febrero de 2017
Versión Hardware: 17
Versión del controlador: 2.3.0.4

Martyn
Pico Staff Member
Pico Staff Member
Posts: 255
Joined: Thu Aug 11, 2011 7:43 am
Location: Cambridgeshire

Re: DC signal using CA coupling

Post by Martyn » Mon Sep 11, 2017 9:49 am

Please can you email in to support@picotech.com we need to discuss what you are doing in more detail, and the automotive forum is not the correct place for this.
Martyn
Technical Support Manager

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