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Pocket-Sized 6 GHz 1 TS/s ET Scope

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joeqsmith:

--- Quote from: SJL-Instruments on January 28, 2024, 08:35:43 pm ---
--- Quote from: joeqsmith on January 28, 2024, 07:41:55 pm ---*** Sending X1 or X2, it responds with OK Xn.  Sending X1 followed with R, I do not get any data.  There must be more to it.

--- End quote ---
We were able to get CDF data with the following procedure:
1. Plug in the scope.
2. Issue command X1.
3. Issue command R1 10000 10000 10000 10000 50000 50000 50000 50000.
Does this sequence fail to return data on your unit?


--- End quote ---

I was using 0 65535 rather than 10000 and 50000.  I also had the first 4 channels enabled.  I tried it with your settings and get the following:

NO TRIG ZERO SJLI

So no difference.  I assume X1 is sent with no other payload and terminated normally.  The fact it returns an OK it seems correct.  If X1 is selected and I supply a trigger, it does trigger normally.  It behaves the same for X0 and X1.   I'm sure I am missing something simple as your software appears to work correctly.

SJL-Instruments:

--- Quote from: joeqsmith on January 28, 2024, 09:23:52 pm ---So no difference.  I assume X1 is sent with no other payload and terminated normally.  The fact it returns an OK it seems correct.  If X1 is selected and I supply a trigger, it does trigger normally.  It behaves the same for X0 and X1.   I'm sure I am missing something simple as your software appears to work correctly.

--- End quote ---
That's odd. Are you sending any commands in between? Sending a D command will reset to normal trigger mode (X0) - see our reply #154.
Our software issues exactly this sequence (X1 then R).

SJL-Instruments:

--- Quote from: joeqsmith on January 28, 2024, 09:02:04 pm ---As it continues to run, it's interesting that channel 1 never exhibits these downward spikes where the other three do.  It never happens in the valley, only the peak.  I would not have noticed it as I was only ever looking at channel 1 with my software until today.   I'll take your word for it that it is the expected behavior from your design perspective.  As a user, I would be concerned it was my signal generator causing this, then spending time hunting down a problem that isn't there.   

--- End quote ---
The data you posted in #156 is within specified behavior, but a bit on the worse side (~5 mV min-max spread after 50 sweeps). The data in #159 is not within specifications (~15 mV min-max spread).

We are running a test unit in the same configuration as you (~240mVpp @ 1 GHz on all channels), and so far (300 sweeps) our min-max spread on all channels does not exceed 1.1 mV. This is using the interpolation method - doing an error function fit pushes the noise even lower.

Can you send the raw CDF data from some of the worst samples (~15 mV off)? What holdoff and trigger level are you using?

joeqsmith:

--- Quote from: SJL-Instruments on January 28, 2024, 09:32:38 pm ---
--- Quote from: joeqsmith on January 28, 2024, 09:23:52 pm ---So no difference.  I assume X1 is sent with no other payload and terminated normally.  The fact it returns an OK it seems correct.  If X1 is selected and I supply a trigger, it does trigger normally.  It behaves the same for X0 and X1.   I'm sure I am missing something simple as your software appears to work correctly.

--- End quote ---
That's odd. Are you sending any commands in between? Sending a D command will reset to normal trigger mode (X0) - see our reply #154.
Our software issues exactly this sequence (X1 then R).

--- End quote ---

Yes, I always send the D prior to sending R.  Good to know it resets the trigger mode.  May want to consider adding that note to the manual. 

I am trying it now and it appears to be working correctly. 

joeqsmith:

--- Quote from: SJL-Instruments on January 28, 2024, 09:58:44 pm ---We are running a test unit in the same configuration as you (~240mVpp @ 1 GHz on all channels), and so far (300 sweeps) our min-max spread on all channels does not exceed 1.1 mV. This is using the interpolation method - doing an error function fit pushes the noise even lower.

--- End quote ---

I'm using 30 samples, linear fit interpolation . 


--- Quote from: SJL-Instruments on January 28, 2024, 09:58:44 pm ---Can you send the raw CDF data from some of the worst samples (~15 mV off)?

--- End quote ---
If I use your software to stream all the data to disk and let it run for a half hour, could you track it down from that?   

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