Accurate Measurements on pulsed system's harder than you think.

[tinman]

A Circuit to study might be a good start:

Tinman, is this Circuit correct? SW1 being the manual Clip lead connection.

   Chris Sykes
       hyiq.org

Lets figure out what's going on...

No,that circuit is incorrect.

[EMJunkie]

Then you are seeing things all wrong EMJ.

No you wont,you will see a voltage across all four components when Q1 switches on,as there is no voltage across any when the circuit is open except Q1. As you can see in both mine and TK's scope shot's,there is no voltage across the CVR or bulb when Q1 is open,and the cap disconnected. We are looking at the CVR and the bulb,and that is where the scope probe's are placed.

I ask the same of you that i have asked of others that think there is nothing to it-->post a video without the inductor,and show us how an incandescent bulb can dissipate more power with less total current flowing through it,and less power with more total current flowing through it.

You may also like to look at TK's latest scope shot's,and have a look at the total current flowing through the CVR,and voltage across the bulb with and without the cap connected in the circuit. Are you telling me that the error margin could be this big ?. And dont forget,this is TK carrying out these test,and he knows his way around power measurements.


Brad

Brad, its your circuit, you know better than me.

Removing the Inductor removes its Impedance thus changing the Circuit.

Is the Circuit correct?

   Chris Sykes
       hyiq.org

[tinman]

Something is wrong with the mean calculation!

At 2 volts per division for the Yellow Trace, its not giving you the right figure.

I agree with what Verpies said:

   Chris Sykes
       hyiq.org

JOKE: Try DC Coupling.... Hahahaha

EMJ
This is where incorrect assumptions start,and i hope you either remove this claim,or correct it.
If you listen to the video,and watch the video carefully,then you will know that i have dropped the channel down 1 division so as to fit the whole wave form in the scopes screen.
So the mean value given is correct,and your red voltage calculation you added to the scope shot is incorrect.


Brad

[EMJunkie]

No,that circuit is incorrect.

Please elaborate?

   Chris Sykes
       hyiq.org

[EMJunkie]

EMJ
This is where incorrect assumptions start,and i hope you either remove this claim,or correct it.
If you listen to the video,and watch the video carefully,then you will know that i have dropped the channel down 1 division so as to fit the whole wave form in the scopes screen.
So the mean value given is correct,and your red voltage calculation you added to the scope shot is incorrect.


Brad

Brad, from Baseline to the indicated Trace Line is only 1.7 volts approx. Have you Changed your baseline value to +2V

   Chris Sykes
       hyiq.org