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When it comes to test equipment automation, you might have heard of the term “ VISA“. Automation can be dangerous – please ensure you have considered the risks that may arise from the worst-case-scenario before embarking on unattended use of automation for test sequences. The author cannot be held responsible for any errors, omissions or damages, regardless of how they may occur, as a result of using or the inability to use the content provided. Having it around is like having my own lab assistant that never gets tired, that never makes mistakes, that works even when I’m asleep … it’s very powerful but also potentially dangerous.Īs a result, I decided to put together this tutorial which tries to collate all of my experience in one place for those who might want to get that little bit more out of their SCPI-capable instruments. An understanding of basic Python 3 is assumed – don’t worry, it’s pretty easy to learn compared to most other programming languages.ĭisclaimer: The following tutorial is provided in good faith. Since then, I couldn’t imagine doing most of the experiments I have done for this blog without using SCPI automation through pyvisa.
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Maybe it’s the thick programming manual and the SCPI syntax which is not commonly encountered anywhere else. But instead of wearing out the knobs on my instruments, I decided to look into what it would take to automate this and found it surprisingly easy to the point I wondered why so few people bothered to even try. When I see this, it makes me sigh in frustration – because I was once like this too. use a second or third instrument, combine instruments from other vendors).
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Otherwise, they are using the software that the instrument came with – some of it looks like it was built in the Windows XP era, but almost always, I hear complaints of how they “wished” they could do something slightly different to what the software is capable of (e.g. Yet, it is my experience that so many good instruments sit on the bench, while operators twiddle the knobs one-step at a time, writing down readings one by one in a lab notebook while the remote control interfaces on the rear of the instrument are left unplugged.
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The better instruments adhere to a number of standards, have remote programming interfaces, may come with software drivers, sample code and even a programming manual that’s several hundred pages long. However, it’s no big secret that most branded instruments from reputable test and measurement companies have some programmability to them. Everything else is a bit of an afterthought.
A lot of the time, purchasers tend to focus on specifications such as accuracy and resolution, while also keeping an eye on the price. If you’re using Windows, all you have to do is double-click the file to open it in Windows Media Player.When it comes to running scientific experiments, your test equipment are your “eyes and ears” measuring the quantities you are trying to observe. How Do I Open an AVI File?ĪVI is a proprietary file format created by Microsoft, so if you plan on opening one outside of Windows, you’ll need a third-party application to handle playback. Additionally, this allows for playback without the use of any codecs.
A lossless file will not lose quality over time, regardless of how many times you open or save the file. This makes the files lossless, which results in immensely larger file sizes - approximately 2-3 GB per minute of video.
The file is saved in a multimedia container format that stores audio and video using a variety of codecs, like DivX and XviD.Īn AVI file uses less compression to store files and takes up more space than many other video formats-like MPEG and MOV. AVI files also can be created without the use of compression at all. First developed in 1992 by Microsoft, AVI is the standard video format for Windows machines.