Good day everyone!
I have found some inconsistency in AC source parameters and reading during simulation in proteus.
For example, if I take VSINE device and define amplitude as 220*sqrt(2).

and then run simulation AC voltmeter will show 220 volts


But oscilloscope shows peak-to-peak 220*sqrt(2) so amplitude is 220/sqrt(2)


does anybody know something about it?

 

AC voltage is RMS voltage.

amplitude
= V x √2 / 2
= V x √2 x √2 / ( 2 x √2)
= V x 2 / ( 2 x √2)
= V / √2

 

Good day everyone!
I have found some inconsistency in AC source parameters and reading during simulation in proteus.
For example, if I take VSINE device and define amplitude as 220*sqrt(2).View attachment 367839

and then run simulation AC voltmeter will show 220 volts
View attachment 367840

But oscilloscope shows peak-to-peak 220*sqrt(2) so amplitude is 220/sqrt(2)
View attachment 367841

does anybody know something about it?

Congratulations! You have discovered how to set a source to a specific RMS voltage when the parameter is peak voltage.

 

hi Yz,
Welcome to AAC.
Google proteus 220v *sqrt(2)

Note the comment regarding entering 312v if the parsing formula fails

E
Clip:

To simulate a standard 220V RMS AC mains power supply in the Proteus Design Suite using a VSINE component, you must enter the peak voltage in the Amplitude field. [1, 2]
The exact value of \(220 \times \sqrt{2}\) is 311.13 V.

Setting Up the VSINE Source
When editing the properties of your AC voltage source, configure the parameters as follows:

• Amplitude: 311.13V (or enter 220*sqrt(2) directly if your version supports expressions).

 

Don't understand why your 'scope shows 155Vpk when 220Vrms is 311V peak(?).

 

does anybody know something about it?

You need to add GND and connect it to the V1 AC source.

 

Thank you for all your answers

To simulate a standard 220V RMS AC mains power supply in the Proteus Design Suite using a VSINE component, you must enter the peak voltage in the Amplitude field. [1, 2]

thanks for the book

Don't understand why your 'scope shows 155Vpk when 220Vrms is 311V peak(?).

Yes it was the thing that confused me.

You need to add GND and connect it to the V1 AC source.

Thank you, it solved the problem.

 

LTspice generally complains if a device/source is left floating.