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  • EEVblog #685 – What Is Oscilloscope AC Trigger Coupling?

    Posted on November 20th, 2014 EEVblog 4 comments


    In this tutorial Dave describes what AC trigger coupling is on an oscilloscope and why it can be useful. Not only on old analog CRT oscilloscopes, but modern digital scopes as well.
    How and why is it different to AC channel input coupling?
    Also, use of the 50% trigger control, and how the venerable DS1052E is still more usable than the new DS1054Z.

    Previous video on Rigol DS1054Z and DS2000 Jitter Problem

    Forum HERE

  • EEVblog #684 – Ness SMT Maufacturing & Assembly Factory Tour

    Posted on November 19th, 2014 EEVblog 10 comments


    The founder and CEO of Ness Corporation Naz Circosta takes us on a personal tour of the companies impressive worlds class surface mount and through hole manufacturing facility where they produce hundreds of different Ness security and automation products.
    It’s no every day the CEO of a major company has the technical knowledge to take you on such a tour of their own production facilities!
    He shows the Yamaha SMD/SMT pick and place machines, solder stencil paste machine, flying probe testers, optical vision inspection equipment, custom test jigs, and plastic ultrasonic welding machines. And also talks about buying a $1M Objet 3D printer, and the advantages of genuine high quality Fresnel lenses vs cheap generic ones in PIR sensor performance.

  • EEVblog #683 – Rigol DS1000Z & DS2000 Oscilloscope Jitter Problems

    Posted on November 14th, 2014 EEVblog 12 comments


    Dave investigates two very serious issues with jitter on the Rigol DS1000Z series oscilloscopes, including the DS1104Z and new DS1054Z
    Some sort of modulated sampling/trigger jitter problem at 5 microsecond intervals (the “5us jitter problem”). And severe jitter with the AC coupled trigger mode, a problem which is also present on the DS2000 series scopes as well.

    NOTE: So many people have been confusing AC trigger coupling with AC input coupling people will be more familiar with. This issue has *nothing* to do with AC input coupling, it is AC trigger coupling!

    Mads from EcProjects found the 5us jitter problem

    Forum HERE

  • EEVblog #682 – Ness D16X Alarm Panel Repair

    Posted on November 10th, 2014 EEVblog 8 comments


    Part teardown, part repair, Dave looks at an Australian designed and manufactured Ness D16X alarm panel that has failed.
    What’s that smell?
    Can it be fixed?
    How do you repair solder mask on a PCB?, or add solder mask to your own home etched PCB’s?
    And another look at PCB spark gaps.
    Previous PCB Spark gap video

    Datasheets:
    Fairchild F8
    Holtek DTMF Receiver
    Maxcap Capacitors
    Epcos MOVs

    Forum HERE

  • EEVblog #681 – More Solar Roadways BULLSHIT!

    Posted on November 7th, 2014 EEVblog 19 comments


    Dave yet again debunks Solar (Freaking) Roadways. This time the prototype SolaRoad solar cycleway path installed in Amsterdam in Netherlands.
    Dave shows how to go about doing ballpark engineering feasibility calculations for such a project, calculates the expected payback period, and SPOILER, shows why Solar Roadways will never be a viable technology. This time using real measured data from the Netherlands cycleway prototype, and real measured solar insolation data for the Netherlands

    Links:
    1st Video HERE
    Live output data from Dave’s 3kW solar system

    SolaRoad Project Website
    SolaRoad Newsletter
    Solaroads press release
    Road Construction Costs
    Road network
    lengths
    Average Household Energy Consumption
    Price Per Watt for solar panels:
    PV System installation costs
    Solar Irradiance / Insolation data
    Electricity prices for households
    Sunpower P18 solar panel Datasheet

    Forum HERE