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    EEVblog #1056 – Digilent Open Scope MZ Review

    Dave looks at the Digilent Open Scope MZ Review, an $89 open source oscilloscope, logic ...

    • anonymous9573

      Just wanted to say that there are schematics of this meter lying around here: http://home.comcast.net/~joegwinn/

      • Fraser


        Cheers mate, those schematics enabled me to rebuild the input of my AVO Megger B131. It got seriously fried by a previous owner. There were two unidentified transistors…now sorted and working. The B131 is actually made by Shanghai Hongbang Technology Co,Ltd but they use a very similar input circuit to the Extech.

    • How did you managed to get those schematics? 🙂 Aren’t they supposed to be kept private ?

    • Karl (not that Karl, the other Karl)
    • George Graves

      What’s the old LCR meter you use to always see around? It was really gray with the odd looking push buttons up and down the side?

    • John

      Wow, RS232 adapter, I feel like it’s the 90’s again.

    • zaphod

      no more meter reviews…

      • no more meter reviews

        • James

          Equipment reviews are great. Provides the prospective of a experienced electronics engineer.

    • Drone

      Hi, Please keep in-mind all these LC meters operate at low frequency (hundreds or thousands of Hertz), so you will NOT be able to measure parasitic effects at higher frequencies! This makes these meters of questionable worth when working at MHz and above frequencies.

      BTW below is a link to a meter that has nice specs and costs $99 USD in kit form. (I’m not affiliated with Mfgr. in any way.)

      For me, the main difference between the $99 meter and the Extech is that the Extech can measure much higher inductance, which is important if you are working with motors, mains power transformers and certain types of audio gear.


      Dave in Jakarta

    • Great review!

      Why are they using the yellow through-hole plastic caps on the right hand side on the PCB?

    • Steve

      As always, Great Job! I love? your Vlog! On your previous Vlog recommendations/review I bought a Meterman 37xr, a great meter!

      My question is because the 37xr does Inductance, Resistance and Capacitance, do you think it would still be necessary to look into and LCR meter?

    • Jan

      Hi Dave,

      thanks for reviewing this lcr-meter. The “twing”-sound, i guess, comes from the spring which connects the inner shield to the meters ground. I bought this meter and I am happy with it.

      Keep on reviewing electronic tools!
      Btw. what about Rigols Funktion/Arbitrary Waveform Generators?

      Jan from Germany

    • Ivan

      I love your blog. Keep up the good work.
      Thank You for reviewing this meter.

      Ivan from Croatia

    • Michael

      The Peak Atlas LCR 40 Meter has a test fequency for about 200kHz


      (But no backlight and no RS232 port.)

      • Michael

        … it is also cheaper as the Extech and made in UK.

    • holger morgen

      The Voltcraft 4080 is the EXACT same meter, but in gray colors.
      One nice feature was a 230V power adaptor that came with it. A nice feature: if you use the power connector at the top, the automatic turnoff is automaticly disabled.:-)
      Only bad part is the display. is get scratched easily.

    • I think it’s very good that there are tools that affordable for amateurs like me.

      Also I recently found another similar device: TH2821, which can be bought on Ebay only for $ 150.

      Both devices have similar characteristics in terms of accuracy and frequency.

      It would be interesting to know what their differences, and which unit is better.

    • ispeakmymind

      David, you does good multimeter reviews, you go for the protection and ergonomic features with a thorough analysis of the circuit-layouts.

      BUT this item is an LCR meter which is NOT supposed to take measurements from live DC/AC system. You do not need those protection covers on the leads.

      $200USD for a device running on ‘TI MSP430’ is a good bargain. And it is ‘Made in Taiwan’ (World’s strongest electronics country) !

      You get good sponsorship fees from the online retailers(TEquipment etc) but you need to stop bashing ‘Chinese-multimeters’. Not everyone have a $20K budget for a scene back-drop like you.

      Thanks for the fellow posters for sharing the schematics. They are very useful.

      WAKE UP! DAVE!

    • I just like the helpful info you provide for your articles.

      I’ll bookmark your blog and test again right here regularly.
      I am moderately certain I’ll learn many new stuff right here!
      Good luck for the next!

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