Hi Benno,

Is there some other venue where I can discuss this further with you as you obviously have substantial experience on the particular subject matter of variable frequency drives and EMC?

Thanks

Irvin

Hi Terry, Great recommendations from you - I will certainly follow up on many of your suggestions. I greatly appreciate the assistance you gave me and was pleased to see that your picoscope has an AWG! The PWM problem I am experiencing is coming from a variable frequency controller and AC induction ...

Hi Terry, Thank you very much for all of the information you have provided. I agree that I have probably strayed way beyond the subject matter of this forum. I don't know which other forums I should approach but will look into this. I will definitely try the R-C values you suggested and am grateful ...

Terry,

Just as I sent my last post around 13:55 I noticed your more recent post (12:38pm) - so thank you very much for that. I think I understand it a little better now. If you don't mind could you still have a look at my queries and if you can assist in any way that would be great.

Thanks

Irvin

Hi Terry, Thanks very much for your excellent explanation of what is likely to be happening. Just to let you know (as this may mean a lot more to you than me) the picoscope manual states that the AWG output impedance is 600ohms while the first three input channels (A,B & C) have an impedance of 1Meg...

It looks like the attachment of my .jpg file did not work so I have put the photo into a .pdf file and tried to attach that here.

I look forward to any responses to my queries that anyone may have.

Martyn, Obviously my explanation of how I connected from the picoscope to my R-C circuit wasn't good enough. I did use the crocodile clips to connect to the circuit and BNC connector to the WAG output - I can't see how I could, from a practical point of view, connect it the other way around? I have ...

Thanks Martyn, I am a little confused. Could you please expand on your advice? Are you saying the probes supplied with the picoscope are the problem - and if so, why? By recommending using a BNC adaptor do you mean using cables where one end has a BNC connector and the other end has crocodile clips?...

First, I am a mechanical engineer so please bear with me as the explanation I am looking for is probably obvious to junior electronic engineers! I setup a passive low-pass filter arrangement on a breadboard using a single resistor (160ohm) and capacitor (1micro-farad) to give a cut-off frequency jus...

Thank you. Just to clarify, are you saying that I do not need to manipulate any SDK files in order to obtain output data from the 4 channels on the 2405A and that all I need to do is to use the save function?

Does anyone have software to save all 4 channels of data from the 2405A scope, preferably in .CSV format, or even some guidance on how to do this?

Hi Martyn

Sorry for the separate messages.

Could you please cite a reference that explains the equation for phase calculation?

Thanks again.

Irvin

Martyn

When I go to your link for SDK I cannot find an SDK file for the 2405A scope?

Thanks

Irvin

Thanks Martyn,

I take it there is no way, other than using your formula, to measure the relative phase from two channels? So I can't use the phase rulers in some fashion?

Thanks again

Hi Martyn, Thanks very much for your response. I have since purchased the 2405A scope. I am still a bit confused about the phase measurement. In demo mode I can trigger of channel A or channel B and this will freeze the signal and I can use the phase or time rulers. However my requirement is to meas...