Scaling Waveform from LeCroy 4104HD using Python/IEEE488.2

Question

I am automating control of a LeCroy oscilloscope using IEEE488.2 and Python/PyVisa.

It seems like it should be relatively straightforward. I use the WF? command to get the waveform + header, I use the Template? command to get the template for interpreting the header, and then I convert the proper 4 byte fields to floats to get the VERTICAL GAIN and VERTICAL OFFSET.

The problem is that this gives me a scaling factor that doesn't match what I see on the oscilloscope screen. In this link I have a picture of the scope screen, an xlsx with the Template/Header/Waveform responses, and the Python code I used to put those responses in the xlsx -> https://drive.google.com/file/d/1FGZZ_1fbPYiSIDmTUJg3PWhE15W3i1KR/view?usp=sharing

Can someone please point out what I am doing wrong? It seems this should be really easy.

Edited: Including pictures of scope picture and my scaled waveform.

Can you attach the picture to the question? There is an image button if you edit the question. You can even copy and paste the image in. — Voltage Spike, Mar 29 '22 at 16:19

score 1 · Answer 1 · answered Apr 01 '22 at 15:04

1

The value is a left justified 12bit Q8 number. I suppose I should have noticed the factor of 4 in the pictures.

answered Apr 01 '22 at 15:04

Bobby

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Scaling Waveform from LeCroy 4104HD using Python/IEEE488.2

1 Answers1