Cable length measurements & Reflectometry

Introduction

In this experiment, we will measure cable length by measuring time that signal needs to propagate down the cable and back to the source. This principle is used in time-domain reflectometry, to find and locate faults or damages on long cables.

With this example you will learn about:

  • Transmission line fundamentals
  • Reflections on transmission line
  • Red Pitaya SCPI commands


Cable

Watch video and measurements.

Learning objectives

All documentation is available here.Download Python code.

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EMC Measurements & Teslameter project

Introduction

Welcome to the first Red Pitaya Project Guide. We will create interesting and fun projects and share them with you. EMC or electromagnetic compatibility is equipment’s property  that tells us about  emission of unwanted electromagnetic energy of devices and  its behavior in interfered environment. It also tells us what effects emitted energy induces.
Watch video and measurements.

Learning objectives
With this example you will learn about:

  • EMC radiations and regulations
  • Quantitative estimation of magnetic radiation
  • Design and evaluation of simple analog filters
  • Using Red Pitaya in combination with other circuits
  • Difference between household appliance and outside devices


Teslameter

All documentation is available here. Teslameter can be downloaded from Application marketplace

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Red Pitaya Video Competition: The rules!

1

Dear Red Pitaya readers,

as you may have read on DesignSpark, we will be launching our new and improved website, where one of the new features will be “your personal video”.

In this section, we will be presenting your videos on how to use Red Pitaya. In other words, “your instrument, your application, your style”. You will be able to show us how and why you find Red Pitaya useful, and maybe show us some of the creative work you have done with it. So don´t be shy, show us how you “measured up” so far!

The coolest videos will be rewarded with $200 USD and a surprise gift at the end of the competition, so for all of you who would like to participate, please read our Terms and Conditions below.

We are looking forward to see you!

Red Pitaya team.

 

RED PITAYA COMPETITION TERMS AND CONDITIONS

GENERAL TERMS

1. The Promoter is Red Pitaya whose office is registered at Solkan 5250, Velika pot 22. Slovenia.

2. There is no entry fee and no purchase necessary to enter this competition.

3. Participation in the competition constitutes acceptance of these conditions of entry.

WHO CAN ENTER

4. Competition is open to everybody, regardless the age. The competition is worldwide.

HOW TO ENTER

5. The competition starts on the 18th of December 2014 and ends on 18th of January 2015 at 12.00 pm, Standard Time +0000 UTC.

6. No responsibility can be accepted for entries not received for whatever the reason.

7. You must send an original video that didn´t won previous awards, and that is suitable for public viewing. It has to be no less than one minute and no longer than five minutes long.  All videos have to be send to sent  via Sendspace, WeTransfer or similar provider to: edina.dyachenko@redpitaya.com. The video must be in English or subtitled in English.

8. You can enter the competition alone, or as a team.

9. Acceptable file formats must be in a standard format (such as .mp4).

10. Name, last name, address, phone number, occupation, country of residence, and the title of the video, should be attached in the folder.

11. Any music included in a video must be original. The composition and performance may not have been published by any third party. In case of violation of the intellectual property, the Promoter will disqualify your entry.

THE RULES OF THE COMPETITION AND THE PRIZE

12. The Promoter reserves the right to cancel or amend the competition and these terms and conditions without notice. Any changes to the competition will be notified to entrants as soon as possible by the Promoter.

13. There are two prizes to be won as a part of the Competition. The winning entrant will receive a cash prize of 200$ and a surprise prize. The prizes are not transferable.

14. Winners will be chosen by Red Pitaya jury.

15. The winner will be notified by an email within 14 days of the closing date. If the winner cannot be contacted or do not claim the prize within 14 days of notification, we reserve the right to pick a replacement winner. The name of the winner will be also published on our official Red Pitaya page.

16. The winning entrant  agrees to the use of his/her name and image in any publicity material, such as participating and co-operating as required in all PR activities relating to the Competition, worldwide.

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Something about to happen!

Hello our dear readers.

There´s been plenty going on in the last month at the Red Pitaya. If you followed our Twitter and Facebook account you could see that, we were presenting Red Pitaya at Electronica fair in Munich. It was a great opportunity for us to stand tall next to our general distributor, RS Components.

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We also had an opportunity to meet with the potential future contributors and business partners, so we are working on some unusual collaborations and plans of action at the moment. It´s been super busy to this point, so this post will be our hello and goodbye at once. But don´t worry! We are taking you with us! In the next few days we will be launching a new and improved web site. We took your suggestions seriously so that we could meet your needs, and improve the overall look. It´s a visual world after all! As far as the blog part goes, we will be moving to a much better place, where you will be able to read all sorts of cool blogs about electronics.

New applications and improvements are available on our Bazzar. You are more than welcome to try it out. In the future, all the news regarding the applications and instruments, will be presented on our new wep page.

So this is it for now. Make sure to follow us on Facebook and Twitter, where you will be noted about the latest news.

See you soon at the new and improved Red Pitaya site!

Red Pitaya team.

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3…2…1…LCR Meter
Setup and Test

We had to. Try the LCR meter – ad hoc.

Nothing was easier than taking the protoboard, mounting one of the old golden resistor as a shunt and test … some ‘piezos’ (ultrasonic piezo transducers). The ‘piezos’ that we used as a DUT (device under test) were exactly the same ones which we used earlier in the following two updates:

  • Ultrasonic Music Played and Measured by Red Pitaya
  • Precision to the Last Micron


  • ???????????????????????????????As said, the setup is rather straightforward – connections are as shown in the instructions.

    We set the shunt resistor value, selected the frequency fairly broadly, and then increased the number of steps (10 step resolution is not really representative).

    Sample1
    Sample2As expected the impedance (Z) characteristics were not even close to similar for the two transducers. After all, they are not equal in geometry. What they have in common is the first peak at about 40 kHz – which reflected in almost all parameters plots also. Here we could have been smart about serial capacitance and parallel inductance, but we leave the interpretation to you.

    Another interesting point we tried as well: a mechanical load was applied – a plate was placed in the acoustic field at a distance »d« in front of the transducer.

    obstacle

    It was quickly observed how the impedance curve changed near the first natural frequency – due to reflections and partly standing wave formation it became sharper. It may be nice to see the 3D plot, but we did not investigate further.

    Now this is what one gets with ultrasound. Now imagine how the impedance of an ordinary speaker or perhaps of an X-mas card buzzer is measured (audio frequencies!). Would you happen to know how »Oui?« is pronounced in French? Try this audio measurement yourself. And do not forget – enjoy!

    This is it. So long Red Pitaya and thanks…

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