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Big Clive's "Trashy" meter, unboxed ( Duratool D03047 multimeter )

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Fungus:
Gotta be impressed by Duratool...

Not only can they make a decent DT830 for €3.75, they can also make one with built-in network cable tester for €4.79: :o



(they managed to keep the transistor tester, too :-+ )

xrunner:
That's pretty impressive for the price. Initially I thought the cable testing was performed by manually using the probes and checking the continuity by inserting them into the holes. But no - it has LEDs that indicate for you.  :clap:

Nikola Tesla Junior IV:

--- Quote from: Fungus on April 20, 2023, 10:04:59 am ---
--- Quote from: Nikola Tesla Junior IV on April 20, 2023, 09:00:58 am ---... it would reside within 1 or 2 MM from the outside of the unit where you would be presumably be putting an appendage at some point in time.

--- End quote ---

Is that less than the insulation on a Fluke probe cable?

--- End quote ---

I would guess more.

Perhaps you do not understand the "skin effect" to its full potential. If such is true, then I can elaborate on my short answer to your question.

Its my opinion that it's an insult to include Fluke in the same discussion, and for my reasons, I would direct you to this  -->  https://www.fluke.com/en/learn/blog/safety/safe-test-tools-real-world-use

joeqsmith:

--- Quote from: Fungus on April 17, 2023, 01:49:54 pm ---
--- Quote from: joeqsmith on April 17, 2023, 12:31:55 pm ---Those free meters have gone through several hardware changes over the years to reduce cost.  Even if we saw a difference between the two meters I show, I couldn't tell you if it had anything to do with the label or not. 

--- End quote ---

Is 1100V the limit? Seems to me like a 2000 count meter should be able to display 2000V...  :popcorn:

--- End quote ---

Meter1 is the most recent marked 250V on selector.  Note how large print in the back "Do not test voltages over 250 volts". 
Meter2 is from when I started running these tests marked 1kV on selector. 
Meter3 is the oldest revision I have.

Note how the input has changed over the years to reduce cost.   As far as your thoughts on 2000 count meters should all handle 2kV.  I guess then the UT61E at 20k counts should handle 20kV and the 300k count GMW should handle 300,000 volts? 

Maybe you feel all meters should display a minimum of 2kVDC?  Again, I'm not shy about running them.  Maybe the 121GW, UT91E, the yellow and the latest at 2kV with the meters set to their highest DCV settings. 

***
There were a few people running a similar test using an insulation tester.   Of course, it folds back.  If we run it, the power supply will have enough power available to not fold back.    Are you going to perform the same test with one of your new meters as well? 

robert.rozee:
from a chart on DigiKey's site (https://www.digikey.co.nz/en/blog/what-are-multimeter-cat-safety-ratings) i see:

Measurement CategoryWorking VoltageTransient VoltageTest Source (Impedance)CAT I300 V1500 V30 OhmsCAT II300 V2500 V12 Ohms
Joe: roughly, what physical size of resistors would you expect to see at the front end to meet even the 1500v (cat I) requirements? both as a single resistor, and as a string of SMD resistors.


cheers,
rob   :-)

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