DT830 multimeters

Saw in Facebook discussionhttps://www.facebook.com/groups/electronichobycircuits/permalink/3657982357559780/

https://www.facebook.com/438304376511718/posts/1304575383217942/


Another meter is fried again today!!!

I have six meters blown in 2 years, while reading high voltage AC.
I guess I will find a better alternative for such reading.

Is there a way of fixing spoilt meters!?.

We are talking about this kind of DT830 type multimeters:

My answer:

Those three on the right are basically the same dt830 design with very slight variations. Those are known to work OK on low voltages but are not well designed or protected against high voltages. Some DT830 meters have ended to sales ban lists because are not safe for mains voltage mesurement. I own several dt830 based meters and use them only with low voltage circuits. For mains voltage circuits I use known brand 1000V rated meter!

Some info on dt830 meters – technology and repair information:
https://www.petervis.com/meters/dt830d/dt830d-repair-and-fuse.html
https://www.petervis.com/meters/dt830d/dt830d-circuit-component-values.html
https://forum.allaboutcircuits.com/threads/dt830d-digital-multimeter-repair.165464/
https://www.scribd.com/document/405317612/Digital-Multimeter-DT830B-schematic-diagram
https://www.instructables.com/Digital-Multimeter-Kit-Build-DT830B-DMM-Electronic/

They are this kind of cheap multimeters

Here is DT830B circuit diagram from https://www.hobby-hour.com/electronics/dt830b-digital-multimeter.php

These meters are not designed for high voltage AC. They work quite OK for low voltage measurement.
Don’t buy or use cheap meters to measure high voltage.
Buy Fluke, Agilent, Keysight or another known brand. The quality does matter when your life is on the line.

6 Comments

  1. Tomi Engdahl says:

    Cheapest DT830 multimeters seem to cost $0.99 on ebay

    Reply
  2. Tomi Engdahl says:

    How to use your trashy meter without blowing it up (much)
    https://www.youtube.com/watch?v=-QDW0LRQVrY

    Your first multimeter can initially seem a bit daunting with all the modes, but the only way to learn is to get one and play with it. I damaged my first meter when I was young by using it on the incorrect range. You can damage these cheap meters, but at the cost you don’t have to worry about it too much.

    I probably made this video too long and complicated, but it’s useful to know how things work as well as how to use them.

    The very cheap meters sold for around 5 $/£/€ are usually pretty accurate for their cost and very usable. Once you’ve mastered using one you can move up to something with more features or more suitable for industrial work. These cheap meters are NOT suitable for poking around in distribution boards or industrial equipment with high fault current.

    Meters have a category rating as follows:-
    Cat I – electronic use (these cheap meters)
    Cat II – electrical appliance, but not fixed wiring or distribution boards
    Cat III – general electrical maintenance in panels and machines
    Cat IV – utility level work with very high fault currents

    For industrial work I recommend Fluke as it appeases the clipboard warriors. There are many other brands suited to industrial use too. Beware cheap meters with fake category ratings.

    Reply
  3. Tomi Engdahl says:

    Tuotenimi: Laser 6228
    https://marek.tukes.fi/Tuote.aspx?nettijulkaisuId=10694

    Toimintaohjeet

    Tukesin päätöksellä talouden toimija on määrätty lopettamaan tuotteen myynnin ja muun luovuttamisen; mukaan lukien uudet toimitukset jälleenmyyjille. Koska tuotteesta ei aiheudu välitöntä vaaraa hengelle, terveydelle tai omaisuudelle, talouden toimijaa ei ole velvoitettu keräämään tätä tuotetta pois jälleenmyyjiltä tai loppukäyttäjiltä. Kuluttaja voi kuitenkin kuluttajasuojalain mukaan palauttaa tuotteen virheellisenä (turvallisuusvaatimusten vastaisena) ostopaikkaan, jotta myyjä voi korjata sen vaatimusten mukaiseksi. Ellei korjausta voi tehdä, on myyjällä oikeus antaa korvaava tuote tilalle tai viime kädessä kaupan saa purkaa. Menettelystä on kerrottu tarkemmin kuluttajansuojalaissa.

    Toimenpiteen syy

    Tuote ei täytä sähköturvallisuuslain (1135/2016) eikä tuotetta koskevan eurooppalaisen harmonisoidun standardin EN 61010 vaatimuksia. Mittarin mittapäiden eristämätön osa on liian pitkä verkkojännitettä mittaamaan pystyvälle mittarille.

    Reply

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