Products > Test Equipment

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

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joeqsmith:

--- Quote from: floobydust on April 27, 2023, 04:34:29 am ---"Hardly CAT III" you'd need to run a Dranetz to convert speculation and gut feel to fact. I've used loggers in facilities to see if power is a problem with equipment failures. Like making a measurement with some test equipment  :-DD

--- End quote ---

Several years ago I had Dranetz come in for a visit to demonstrate their latest products.  After the sales demos, I started to ask about their testing.  After all the point is we would be using it to capture various events.  Normally companies will leave the products for a few weeks to get a feel if they are fit for the job.  So I asked them about subjecting it to the various safety standards.   They had no problem with this, so I invited them to attend.  We all had a fun time that day.

joeqsmith:

--- Quote from: Fungus on April 27, 2023, 04:41:12 am ---
--- Quote from: floobydust on April 27, 2023, 04:34:29 am ---I think so far it's magical opinion and unicorns telling us the DT830 is OK at x volts.

--- End quote ---

I never said "DT830".

The Big Clive special is a "D03047" - it says so right there in the title.

"DT830" covers a million variants so I could never make a blanket statement like that.


--- Quote from: floobydust on April 27, 2023, 04:34:29 am ---Not that the product has ever been tested or evaluated to meet its fake claims.

--- End quote ---

What fake claims are those? "CAT I"??

--- End quote ---

Sadly, I suspect they missed the whole point of these measurements with the free DT830 meter were on a CAT1  low energy circuit.   I would have thought that when I stated that the one power supplies current limit kicked in with the input impedance of the meter, something would have clicked.   


--- Quote from: Someone on April 27, 2023, 01:23:16 am ---
--- Quote from: joeqsmith on April 27, 2023, 12:39:49 am ---I'm not going to get all concerned about my home toaster repairs and my CAT III outlets because it's just not the same thing.

--- End quote ---
So what's the supply impedance at those socket outlets?

--- End quote ---

I'll try and make a few measurements today with my tiny home wires.  I assume you will do the same so we have something to compare.  If not, I can measure some larger circuits.   

joeqsmith:

--- Quote from: EEVblog on April 27, 2023, 02:57:47 am ---
--- Quote from: joeqsmith on April 27, 2023, 01:18:44 am ---
--- Quote from: EEVblog on April 27, 2023, 12:53:36 am ---The robustness of bench meters is effectively stamped on the front. Both of mine (Keithly and Keysight) are CAT II 300V. That screams "I'm delicate please don't hurt me!"
No need for testing, just assume all bench meters are delicate snowflakes.

--- End quote ---
Or test them to a common standard and see how they shake out which is what David is asking about.   No big deal to benchmark them.   

--- End quote ---

Sure, but I'd bet few people would care. It's not like you'd use that as a buying decision for a 4 digit priced bench meter.
And if you thought there are a lot of people complaining about blowing up DMM's is pointless, wait until you blow up expensive high end bench meters.
But hey, knock yourself out.

--- End quote ---

David Aurora had asked me so I responded.  No big deal.   I do agree that there are few people in the world who are interested in electronics.  Guessing your point is few people would watch but that's true of all my videos.   :-DD   

I have a friend who owns a motorcycle speed shop and was talking with them about their business.  They made the point of suggesting to go for a drive and count the number of cars vs bikes.   Now take that small percentage of bike and ask how many of them race.  Then how many of that small segment drag.  Not many of us but we have fun.   

As I mentioned, I did ask about robustness of the HP meters before buying them.  It's the only test equipment that I would care about due to it being used to measure several hundred volts  (not to mention the small transients it can get exposed to). It's not like my other equipment that is limited to a < 50V with warnings of ESD damage everywhere.   

joeqsmith:

--- Quote from: Someone on April 27, 2023, 01:23:16 am ---
--- Quote from: joeqsmith on April 27, 2023, 12:39:49 am ---I'm not going to get all concerned about my home toaster repairs and my CAT III outlets because it's just not the same thing.

--- End quote ---
So what's the supply impedance at those socket outlets?

--- End quote ---

I'll try and make a few measurements today with my tiny home wires.  I assume you will do the same so we have something to compare.  If not, I can measure some larger circuits.
[/quote]

I assume because we are talking commercial vs industrial, you want to keep this below 250V? Are you wanting any other metrics or just the impedance for the three legs?   

David Aurora:

--- Quote from: EEVblog on April 27, 2023, 02:57:47 am ---
--- Quote from: joeqsmith on April 27, 2023, 01:18:44 am ---
--- Quote from: EEVblog on April 27, 2023, 12:53:36 am ---The robustness of bench meters is effectively stamped on the front. Both of mine (Keithly and Keysight) are CAT II 300V. That screams "I'm delicate please don't hurt me!"
No need for testing, just assume all bench meters are delicate snowflakes.

--- End quote ---
Or test them to a common standard and see how they shake out which is what David is asking about.   No big deal to benchmark them.   

--- End quote ---

Sure, but I'd bet few people would care. It's not like you'd use that as a buying decision for a 4 digit priced bench meter.
And if you thought there are a lot of people complaining about blowing up DMM's is pointless, wait until you blow up expensive high end bench meters.
But hey, knock yourself out.

--- End quote ---

Not primarily, of course. But if you're scratching your head between models that stack up very similarly (as many meters do), and one is shown to be better built than the other, that's a no brainer. At that price point they're all going to agree on a 9 volt battery or a 10k resistor, so build quality or even little things like display visibility/control layout/fan noise etc start to dominate (for me, anyway). Teardowns are one way of comparing build quality, stress testing is another.

Also, I should clarify (although Joe clearly gets it) that I'm not saying let's try to set fire to top notch instruments and destroy them just for a laugh. I'm saying I'd like to see how different models cope under stress. Same as most other meter tests- can they tolerate a decent voltage when in wrong modes? What happens if you exceed the max voltage or current ratings, does the protection work properly or does damage occur? What happens if there's a spike on the input? What happens if the meters own supply voltage drops during measurements (e.g. during a brown out)? What happens if you flick between front/rear terminals during high voltage/current measurements? And so on.

I think the price of these things is all the more reason to do stringent testing rather than just rubber stamping them because of the price, brand or accuracy. People run these tests and more before declaring a $20 meter good or bad, why not a $5000 meter?

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