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Member's Forum Should Handheld multimeters have color LCD displays?
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Related

Should Handheld multimeters have color LCD displays?

scottiebabe
scottiebabe over 3 years ago

As I am waiting for my OWON HDS242 to come in the mail, I thought I might ask other members how they feel about a handheld multimeter having a power hungry color LCD display.

The product webpage suggests a battery life of 3-6 hours. https://www.owon.com.hk/products_owon_hds200_series_digital_oscilloscope 

Even more interesting/exciting is the batteries can be recharged with a USB-C cable.

Based on Kerry Wong's teardown: http://www.kerrywong.com/2021/09/18/teardown-of-an-owon-hds272s-3-in-1-handheld-oscilloscope-dmm-awg-compared-with-hantek-2d72/ the multimeter functionality is galvanically isolated from the usb connector.

What do you think?

First time trying the poll feature, hopefully I didn't goof it!

Based on Kerry's notes the meter also has the bones of a real oscilloscope (ADC, FPGA, Sample memory, etc..) How performant is oscilloscope it? I don't know yet.... But I am intrigued!

Update: The scopemeter arrived!

Indoors the color LCD looks awesome! For me my multimeter ends up either sitting flat on my desk on in my lap and in both those cases the display is 10x easier to read than a segment LCD without a backlight.

Outdoors with direct sunlight the segment LCD is easier to read than the color LCD.

In the shade outdoors, I think both display technologies are equally legible.

image

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  • baldengineer
    baldengineer over 3 years ago in reply to scottiebabe

    FWIW,  a couple of my friends took my spaghetti code to the next level.

    If you run it on a Pi, you can connect to it via web interface. (I use it in my live streams.) The web object replicates the screen!

    github.com/.../dmm-ble-mp730026

    At some point, I want it to timestamp the captures so I can re-align DMM measurements with video recordings.

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  • scottiebabe
    scottiebabe over 3 years ago in reply to shabaz

    For the price it was too tempting to not buy it and try it out. For basic troubleshooting/investigations/ basic sanity measurements I think it is a total winner (assuming I don’t blowout the frontend in the near future lol)

     Action Shots:

    Probing 12 Mbit USB on a RPi Pico:

     image

    image

    You can even see the 1 ms USB SOF packet

     image

    Probing the 62.5 MHz flash clock line is really pushing the scope to its limits. But you can clearly see the clock signal is there and alive!

    image

    (Why didn't the screenshot include the cursor delta 16 ns, not sure...)

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  • Jan Cumps
    Jan Cumps over 3 years ago in reply to shabaz

    I saw it too.

    I think it's a lovely device. The first time I see a non-bench oscilloscope, and I think it's not a gimmick.

    My bench space is limited. When I need a scope, I have to get it and give it bench space.
    The Owon would be an excellent contender in a generic probing exercises.

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  • shabaz
    shabaz over 3 years ago in reply to scottiebabe

    I was wondering what looked weird in that photo (apart from seeing the waveform on a multimeter!), and then realized that it just looks strange not having any normal multimeter test leads connected to it : ) 

    It's a very much useful device than I originally thought.. I didn't realize it was dual channel.

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  • Jan Cumps
    Jan Cumps over 3 years ago in reply to scottiebabe
    scottiebabe said:
    https://toshiba.semicon-storage.com/content/dam/toshiba-ss-v3/master/en/semiconductor/design-development/innovationcentre/whitepapers/TCM0542_GT20N135SRA.pdf 

    That is a great whitepaper.

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  • Jan Cumps
    Jan Cumps over 3 years ago in reply to dougw

    It may work excellent too. I have some kind of test bed:

    The Keithley DMM6500 has colour display and touch screen. Not a perfect example because it's a bench meter. But in essence a DMM with colour and touch.

    I am fluent with operating it, and think it has a good interface. But I need more attention/focus, and typically am spending all attention to the screen and my finger's actions, when I manipulate the meter. Also for simple actions like a range change. 

    (same with a physical calculator, and a simulator of that very calculator on my phone's screen: I am an order of magnitude slower on the touch screen)

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  • scottiebabe
    scottiebabe over 3 years ago in reply to Jan Cumps

    Yes lol, I had tried to take other screen shots but do to user error, I only later I realized the meter doesn't automatically increment the image finename number (and you only seem to get 4 bmps lol)

    You can see the drive amplitude has a 120 Hz envelope (8.3 ms) to maintain a near unity power factor:

    image

    https://toshiba.semicon-storage.com/content/dam/toshiba-ss-v3/master/en/semiconductor/design-development/innovationcentre/whitepapers/TCM0542_GT20N135SRA.pdf 

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  • Jan Cumps
    Jan Cumps over 3 years ago in reply to scottiebabe

    are yoou sure that the signal form isn't an aliasing artifact?

    (what I actually wanted to say: cool meter!!!!)

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  • scottiebabe
    scottiebabe over 3 years ago

    There is no denying I got a warm fuzzy feeling when I powered on the scopemeter for the first time! But who doesn’t like getting new shinny things, or better yet, new test gear!
    Ohh Scottie what frequencies does your induction cooktop switch at?
    Let me make a loop antenna with my scope probe and measure it with my OWON HDS242 scopemeter:

    image

    Between 19 kHz and 36 kHz. LOL


    I definitely love having a bright color display! Will I love the battery life that is the question!!

    image

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  • dougw
    dougw over 3 years ago in reply to Jan Cumps

    How about a touch screen - operate with just one hand?

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