Troubleshooting Circuit Simulation: Incorrect Readings on Negative Terminal

  • Thread starter Thread starter otomanb
  • Start date Start date
  • Tags Tags
    Circuit
Click For Summary

Discussion Overview

The discussion revolves around troubleshooting issues in a circuit simulation software, specifically focusing on incorrect voltage readings at the negative terminal and discrepancies in current measurements. Participants explore potential causes and solutions related to grounding and the interpretation of RMS values.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant reports a voltage reading of 1.80 microvolts at the negative terminal, which they believe should be zero, questioning whether the software or their understanding is at fault.
  • Another participant notes a discrepancy in current readings, suggesting that the negative terminal of the battery may need to be grounded.
  • A suggestion is made to move the probe to different locations on the negative terminal to address the small voltage error, with a hypothesis that the software might assign a small resistance to the connecting wires.
  • One participant observes that the software is plotting a graph with a voltage greater than the expected RMS value of 10 volts, questioning whether the graph represents RMS values or peak voltages.
  • A formula is provided by a participant to convert RMS to peak voltage, indicating that if the RMS value is 10, the peak value would be 14.14 volts.
  • Another participant mentions that their simulation software does not require grounding but expresses willingness to try grounding the circuit as suggested.
  • Instructions are given on how to place a ground symbol and connect it with a wire in the simulation software.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of grounding in the simulation and the interpretation of voltage readings, indicating that multiple competing views remain without a clear consensus.

Contextual Notes

There are unresolved questions regarding the software's behavior, particularly about the voltage readings at the negative terminal and the graph plotting. The discussion also highlights assumptions about grounding requirements that may vary between different simulation programs.

Who May Find This Useful

Individuals working with circuit simulation software, particularly those troubleshooting voltage and current readings, as well as those interested in understanding the implications of grounding in circuit simulations.

otomanb
Messages
59
Reaction score
0
Here i m using a simulation software, but it showing me problem.
the software is showing 1.80 micro voltss at negative terminal which should be zero. Plz see image.

http://i49.tinypic.com/nf5s9h.png

Is software is doing some mistake or i have little knowledge?
 
Engineering news on Phys.org
The current seems to be slightly wrong too. I get 1.83333 Amps, not 1.80.

Should the negative terminal of the battery be grounded?

Try moving your probe to the negative terminal to fix the very small voltage error. Maybe the program assigns a small resistance to the connecting wires?
 
Last edited:
@vk6kro
I moved prob to all most every place of negative terminal on that time but it was showing the same result.

Here i found another thing in the software. Its plotting graph with an error.
I applied RMS 10 Ac as you can see in the pic but it plotting graph more than 10 volts. Is it plotting RMS value or Volts. :cry:
Image
30be61d.png
 
If that 10 volts was 10 volts RMS, then the peak value will be 14.14 volts ie 10 times the square root of 2.

Did you try earthing some point of the previous circuit? Like the negative terminal of the battery? I have a simulation program that insists on having some point in the circuit earthed.
 
ya this time i got it. formula is Emax=Erms/.707
if we put RMS value of 10 and then divide it to .707 then we get 14.14 Volts. Ya the software is right. Thanks for that
second, is i haven't grounded the previous circuit, my software don't insist me. But i will try to ground it. Can you please give me the image that how to ground.
 
otomanb said:
ya this time i got it. formula is Emax=Erms/.707
if we put RMS value of 10 and then divide it to .707 then we get 14.14 Volts. Ya the software is right. Thanks for that
second, is i haven't grounded the previous circuit, my software don't insist me. But i will try to ground it. Can you please give me the image that how to ground.


You should be able to place a ground symbol, and then add a wire to connect it.
 
An Earth symbol looks like this:

earth symbol.PNG
 

Similar threads

Replies
26
Views
5K
Replies
9
Views
8K
  • · Replies 5 ·
Replies
5
Views
4K
  • · Replies 18 ·
Replies
18
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
6K
Replies
12
Views
3K
  • · Replies 7 ·
Replies
7
Views
4K
  • · Replies 1 ·
Replies
1
Views
5K
Replies
10
Views
2K