Proteus Oscilloscope

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Reaper06

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Hello
Probes you connect to Oscilloscope channels have a ground clip too but in the proteus the oscilloscope channels don't have such thing and as you can see in this circuit i want to see the signal wave for C1 , like C2, but with this wiring channel A shows the input Signal, so what should i do ?
thank you
 
I don't know Proteus. But, if it's a virtual oscilloscope, it might be able to calculate and display the difference, between two channels. So it can solve your needs:
Connect either side of C1 to a separate channel each, i.e. to A and B, then do the math A-B. You can connect C2 to input C.
Inputs of virtual oscilloscopes are imho always internally connected to ground, so don't need a ground "clip".

cheers
 
The ground is assumed.... This is a four channel scope... There is no waveform on B as this is a rectified source.... If I put 5vac into C1 at 20hz ~20Khz B reads a dc voltage...
 
thank you for answering. you are right, the problem is that ground is internally connected to the circuit ground so i can't see the signal of a single component and about the A-B thing as you can see i only have the A+B option
 
Ian Rogers said:
The ground is assumed.... This is a four channel scope... There is no waveform on B as this is a rectified source.... If I put 5vac into C1 at 20hz ~20Khz B reads a dc voltage...
Click to expand...
yes the problem is that the ground is assumed, also i know there is no waveform on B, i want to see the DC voltage for C1 just like C2 but it shows the input.
 
Yeah JimB, that's it! Look, think, sometimes RTFM - then solve the problem.
Btw, the circuit above has not load. Hence, after all C's are fully charged, full AC across C1 and the peak-peak AC across C2 will be visible.

Renato
 
Reaper06 said:
Yea (invert)A+B looks ok but i don't know if it is the correct approach
Click to expand...

Well, lets put it this way, it has been the usual approach to the problem since I started using real oscilloscopes, about 50 years ago.
So I guess that it should work on a computer "game type" oscilloscope.

JimB
 
JimB said:
Well, lets put it this way, it has been the usual approach to the problem since I started using real oscilloscopes, about 50 years ago.
So I guess that it should work on a computer "game type" oscilloscope.

JimB
Click to expand...
i don't know how old oscilloscopes work but today's oscilloscopes usually have a probe like this :

and the usual approach is that you simply connect the ground clip and probe tip to any single component and it shows the signal on a single channel. no need for inverting and Summing and using 2 channels. so i wondered if anyone who is expert in PROTEUS "Game?" could help me with that. sorry for wasting your time asking questions about games.
 
Last edited:
Reaper06 said:
so i wondered if anyone who is expert in PROTEUS "Game?" could help me with that. sorry for wasting your time asking questions about games.
Click to expand...
Short answer is No.. That's why there is the "Add on" Analytics module… This can give graph output similar to LT spice.. Here you can see the relationship from outputs.... The "probe" inputs can be placed anywhere on the circuit so you can analyse these outputs..

Incidentally… It is dangerous to put the ground clamp anywhere but ground in a real circuit... Dave did a feature on this in one of his EEVblogs

https://www.eevblog.com/tag/oscilloscope/
 
Ian Rogers said:
Incidentally… It is dangerous to put the ground clamp anywhere but ground in a real circuit...
Click to expand...
+1 for that!

If you need to look at the waveform _across_ any non-grounded component rather than to actual circuit ground, you must use two probes connected to two 'scope channels configured in differential mode.
(Both probe ground clips still connect to circuit ground).

Any other method involves possible false readings at best, up to catastrophic damage to either the device being tested, the scope or the user at worst...
 
i often use the "A+(invert)B" method to troubleshoot the hot side of SMPS supplies. that way i don't have to worry about the scope ground being "hot". in other SPICE software, you don't have a simulation of the oscope controls. if you want to plot a voltage or current you select the node and measurement from a list. you can even display the results of calculations such as "V(node1)-V(node2) for a voltage difference, or "(V(node1)-V(node2))*I(R1) for the power dissipation in a resistor. while the oscope controls might be easy to use in a circuit simulator, it has it's limitations.
 

Totally disagree. In older scopes the clip is connected to earth ground. All sorts of sparks happen if grounds are at different potentials.

In newer scopes and instruments there is a maximum permissible limit that ground can be floated.
 
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