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surena - 17 May 2005 00:53 GMT

How I can find the current curve of a circuit?
I make circuits like simple RC with a Vsin source and put V and I
marker. The V marker gives the expected sin curve of V, but I marker
needs a pin and after that the curve is a flat (0) line and not a sin
wave. Maybe the problem is how I put the pin. I do not know. Any help?

Surena

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Terry Pinnell - 17 May 2005 06:14 GMT

>How I can find the current curve of a circuit?
>I make circuits like simple RC with a Vsin source and put V and I
[quoted text clipped - 3 lines]
>
>Surena

You don't give much information - such as the component and voltage
values, and the software you are using! But, guessing, one possibility
is that current is dominated by voltage at the particular scale your
program is using, like this:
http://www.terrypin.dial.pipex.com/Images/RC-Measuring1.gif

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Terry Pinnell
Hobbyist, West Sussex, UK

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surena - 18 May 2005 02:53 GMT

Yes, You are right. Using separate window shows the current wave. But I
use Orcad capture 9.2 and I want to know how I can see voltage and
current as two separate scales as you did in your gif picture? Also how
I can show that current for example lags voltage by 90 degrees (phase
difference)?

Surena.

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Jim Thompson - 18 May 2005 03:15 GMT

>Yes, You are right. Using separate window shows the current wave. But I
>use Orcad capture 9.2 and I want to know how I can see voltage and
[quoted text clipped - 3 lines]
>
>Surena.

In Probe, click "Help", "Search", type in "axis" and read the steps.

...Jim Thompson

I love to cook with wine. Sometimes I even put it in the food.

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Electronics Forum / CAD / May 2005

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