Measuring Voltage

[Rumieus]

How do you measure V(out) using osilloscope?

Vin=10Vpp
f=25Hz
R=1K
C=16nF

 

[Hero999]

**broken link removed**

 

[Rumieus]

From the oscilloscope, how do you measure V(out), the answer for voltage divider V(out) is 0.025V.

I know how to calculate frequency, F=1/t.
Vpp = 2Vp.

But I cant figure out how to calculate V(out) using the waveform.

 

[KMoffett]

This and:

https://www.electro-tech-online.com/threads/capacitor.42535/#post349273

are starting to look like you want someone to do your homework...???

Ken

 

[Nigel Goodwin]

I've no idea what the figures are about?, but you stick the scope on the output, and measure it - that's what a scope is for.

 

[Hero999]

The scale is 5V/division therefore it's 5V peak or 10V peak to peak.

The RMS voltage is 5/√2 = 3.54V.

 

[Rumieus]

It's not my homework..
I don't understand and I post it here..
And the other thread I post (same as this post) was a failure because of internet connection.

I want to calculate V(out) using oscilloscope.

From mathematic equation, we can find V(out) using,
Xc = 1/2 pai Fc
Z= √Xc² + R²

And V(out) = Vin x R/Z.

But how to calculate it using oscilloscope?

 

[Mikebits]

Hero just told you and gave you a link explaining it. Read the info on the links.

 

[Hero999]

It's a duplicate thread.
https://www.electro-tech-online.com/threads/measuring-voltage.42536/

Please do not make duplicate posts or threads, they do not increase your chance of a helpful response but only reduce it, as people get confused and can't always see what others have suggested in the other thread(s).

If you have made this post or thread in error then please do not be offended. We get lots of people making duplicate threads under the misapprehension that it will increase their chance of a helpful response when in practice the reverse is true.

 

[MrAl]

Hi Rumieus,

Looks like a couple of problems with your circuit or scope.

First, the wave generator looks like it is set for 25Hz yet your scope
appears to show 50Hz.

Second, why are you feeding the network with plus and minus sine waves
when your formula only shows one input (like from the plus sine wave)?

 

[Rumieus]

Yeah.. I reduce the frequency from 50hz to 25hz after I took a screen shot of my computer.. Sorry about that..

 

[MrAl]

Hi again,

Ok, so why feed it with plus and minus sine waves instead of just a
single plus sine wave?

 

[Rumieus]

Is there any different?

 

[Rumieus]

From the attachment, V(out) = √2 x 17.771mV = 0.025V which is correct according to the book I'm currently studying.

So how we find V(out) using oscilloscope?
5V/div x 2 = 10V, which is the V(in).
Vp = 2Vpp, = 5V.

Vrms = (1/√2) x Vp.

So how you find V(out) from the wave?