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| Open source EEZ Studio for accessing your (SCPI) instruments |
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| kawal:
trying to make a graph So far a was able to create an array of frequency steps and an array of data points for the corresponding frequencies. Trying to make a graph from the data but the scope examples are confusing. Is the scope data organized as [x1,y1,X2 y2.......Xn,Yn]? If I need interleaved data I can easily do that inside the js. here is the js code so far connection.acquire(); connection.command("FORMat real 64"); var StartF = await connection.query("SENSe1:FREQuency:STARt?"); var StopF = await connection.query("SENSe1:FREQuency:STOP?"); var PointsF = await connection.query("SENSe1:SWEep:POINts?"); var StepF = ((StopF-StartF)/(PointsF-1)); // notify.info(`steps ${StepF/1000000}MHz`); var freq = []; var level = await connection.query("TRAC? CH1FDATA"); var level_array = level.split(','); for (var i =0; i < PointsF; ++i){ freq.push(StartF + i * StepF); //notify.info(freq); } // notify.info(freq[0]/1000000); // notify.info(freq[PointsF-1]/1000000); // notify.info(level_array[1]); |
| mvladic:
If you mean the example of "Waveform data" for the Keysight oscilloscope, then know that in that example the data is not sent as [x1, y1, x2, y2, ...] but as [y1, y2, ...], and the x values are defined with sampleRate, i.e. x values are implicitly calculated, so they are not sent. |
| kawal:
thanks for your reply . Yes .... that should be easily adapted to my needs as the VNA 8714ET also sends only Y values. I calculated all the X values and the x step. But its still complicated for me to understand how to get the data to display. I found that the instrument also generates prn files that are easily imported to excel so thats my fall back. I would love to get the instrument working as the scope example. here is an example prn file. The array here provides the y values: var level = await connection.query("TRAC? CH1FDATA"); var level_array = level.split(','); here I calculate the step size between the samples on the x axis var StartF = await connection.query("SENSe1:FREQuency:STARt?"); // read start frequency (5MHz) var StopF = await connection.query("SENSe1:FREQuency:STOP?"); // read stop frequency (55MHZ) var PointsF = await connection.query("SENSe1:SWEep:POINts?"); //read number of points (401) var StepF = ((StopF-StartF)/(PointsF-1)); // calculate the step size 0.125MHz My graph is not rolling data but should be from 5Mhz to 55Mhz with a 0.125Mhz in between every sample The issue is what next ? There is the preamble stuff that is confusing me. Maciej |
| mvladic:
Here is the example how to add a chart where data is in CSV format. The source code is in the attached zip file. Some screenshot: |
| kawal:
mvladic I appreciate it . Thank you. kawal |
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