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Pocket-Sized 6 GHz 1 TS/s ET Scope
joeqsmith:
I have no problems at all with your instructions and programming for both devices went smooth. I could not find an Info command in your software, so attached shows the returned values using my software. Assuming this appears correct to you, the next question is what software version do you want me to test with? I assume not the latest with the attempts to correct the problems. Do you have something newer that backs out those changes but has the latest features? From my own software, is there anything I need to be aware of?
Just want to make sure I am testing with what you are expecting.
SJL-Instruments:
--- Quote from: joeqsmith on January 27, 2024, 04:36:56 am ---I have no problems at all with your instructions and programming for both devices went smooth.
--- End quote ---
Good to hear that the documentation is clear and the process went smoothly.
--- Quote from: joeqsmith on January 27, 2024, 04:36:56 am ---I could not find an Info command in your software, so attached shows the returned values using my software.
--- End quote ---
We'll add this to the next version of the software - good catch. Your version info looks as expected.
--- Quote from: joeqsmith on January 27, 2024, 04:36:56 am ---Assuming this appears correct to you, the next question is what software version do you want me to test with? I assume not the latest with the attempts to correct the problems. Do you have something newer that backs out those changes but has the latest features?
--- End quote ---
We have just released minor update v2.5.6 on our website which removes the software filtering (but is otherwise identical to v2.5.5).
--- Quote from: joeqsmith on January 27, 2024, 04:36:56 am ---From my own software, is there anything I need to be aware of?
--- End quote ---
When using the interpolation method to extract voltages from the CDF:
1. Apparent spikes may appear even when the returned CDF data is perfectly correct. A simplified example is attached (example 1). This is only a problem when few (<20) samples per CDF are taken.
2. If two or more voltages in the CDF are equal, sort the corresponding CDF values (for that voltage value) from lowest to highest. If the interpolation is done in an incorrect order, a large apparent spike may result (example 2, attached).
These considerations do not apply if you directly fit an error function to the CDF data.
We just discovered effect (2) recently, so we may send you an updated firmware file tomorrow that implements this sorting for you.
joeqsmith:
--- Quote from: SJL-Instruments on January 27, 2024, 07:22:10 am ---...
We just discovered effect (2) recently, so we may send you an updated firmware file tomorrow that implements this sorting for you.
--- End quote ---
No problem.
In the mean time, I did run it overnight using my software with the LiteVNA attached for a source and no faults were recorded. It's not an extensive test and I will holdoff doing anything more complex until you send the next update to address these last couple of problems.
Congratulations on finding the root cause and correcting it in such short order.
joeqsmith:
Just a quick check using two channels showing two clocks does indeed cause random glitches. So it appears I am able to replicate these other problems you mention.
SJL-Instruments:
--- Quote from: joeqsmith on January 27, 2024, 04:19:47 pm ---Just a quick check using two channels showing two clocks does indeed cause random glitches. So it appears I am able to replicate these other problems you mention.
--- End quote ---
Does this still occur when the trigger level is placed in the middle of the clock high & low levels?
This might be due to the trigger catching the wrong feature (a small wiggle) and sampling a different time.
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