standing wave coil frequency

[ltseung888]

I have converted the CSV files into XLS files because this forum does not allow downloading of CSV files
ADS00026.XLS is the Output and ADS00027 is the Input raw data.  You will find surprises in these two files.

Have fun.

I shall redo the experiment to absolutely confirm that the CSV (XLS) files correspond to the DMP files. 

*** The chance of the ADS00026 and ADS00027 corresponding to the above DMP files is very high.  The Ch1 voltage pp from the file is 7.2V (7.6 on the DMP file) and the Ch2 voltage pp from the file is 280mv (280mV on the DMP file).

[verpies]

You not missing something, your missing a lot more then that.

That's not a scientific argument.
What am I missing?

[verpies]

I have converted the CSV files into XLS files because this forum does not allow downloading of CSV files
ADS00026.XLS is the Output and ADS00027 is the Input raw data.  You will find surprises in these two files.
Have fun.
I shall redo the experiment to absolutely confirm that the CSV (XLS) files correspond to the DMP files. 
*** The chance of the ADS00026 and ADS00027 corresponding to the above DMP files is very high.  The Ch1 voltage pp from the file is 7.2V (7.6 on the DMP file) and the Ch2 voltage pp from the file is 280mv (280mV on the DMP file).

Looks like you have vertical resolution problems.

Look at the attached graph made from the ADS00027.XLS file. The Ch1 is quantized to 2bits ( less than 4 levels - 3 actually). Such large quantization error makes your captured data unsuitable for further calculations.
The vertical resolution of other channels is only a little better:
ADS00026 Ch1: 38 levels (59% of 6 bit resolution)
ADS00026 Ch2: 17 levels (53% of 5 bit resolution)
ADS00027 Ch1:   3 levels (75% of 2 bit resolution)
ADS00027 Ch2: 13 levels (81% of 4 bit resolution)

In ADS00026 you should increase the analog amplification (sensitivity) on Ch1 so it takes the full advantage of your scope's maximum vertical resolution (e.g. all 8-bits, 256 levels).
In fact all the channels should be amplified as much as possible but without incurring clipping by the A/D converter (sampler).  Some people call it "normalization to the A/D limit"...

P.S.
Digitizing at 500Ms/s is fine as long as the sampling of the two channels is simultaneous (not interleaved!)

[ltseung888]

Looks like you have vertical resolution problems.

Look at the attached graph made from the ADS00027.XLS file. The Ch1 is quantized to 2bits ( less than 4 levels - 3 actually). Such large quantization error makes your captured data unsuitable for further calculations.
The vertical resolution of other channels is only a little better:
ADS00026 Ch1: 38 levels (59% of 6 bit resolution)
ADS00026 Ch2: 17 levels (53% of 5 bit resolution)
ADS00027 Ch1:   3 levels (75% of 2 bit resolution)
ADS00027 Ch2: 13 levels (81% of 4 bit resolution)

In ADS00026 you should increase the analog amplification (sensitivity) on Ch1 so it takes the full advantage of your scope's maximum vertical resolution (e.g. all 8-bits, 256 levels).
In fact all the channels should be amplified as much as possible but without incurring clipping by the A/D converter (sampler).  Some people call it "normalization to the A/D limit"...

P.S.
Digitizing at 500Ms/s is fine as long as the sampling of the two channels is simultaneous (not interleaved!)

The scales were set for eyeball comparison purposes.  I shall repeat the experiment to try to get the largest sensitivity.  Prof. Steve Jones uses the better oscilloscope at his BYU University for accurate quantitative measurements.
I shall try to test the limit of the Atten Oscilloscope in the coming experiments.  I do believe the Atten Oscilloscope sample the two channels simultaneously and have common ground.
Thanks for the useful scientific comments.  God Bless.

[verpies]

Prof. Steve Jones uses the better oscilloscope at his BYU University for accurate quantitative measurements.

Even the best digital scope will capture inaccurate data if it's using only 2bits of its A/D converter

Your scopes have 8 bits of vertical resolution, so they are theoretically capable of capturing up to 256 levels of voltage.
It's just a matter of setting the vertical sensitivity (analog amplification)  appropriately to the signal amplitude.