Products > Test Equipment
Pocket-Sized 6 GHz 1 TS/s ET Scope
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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