Products > Test Equipment

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

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Fungus:

--- Quote from: joeqsmith on April 24, 2023, 12:02:06 pm ---The counts will have nothing to do with when the hardware fails.

--- End quote ---

Obviously not.  It's more down to the components, the PCB layout, and the dirt inside it.

It might be fun to do a few tests though.

(even if it tells us nothing because every 830 has a different PCB)


--- Quote from: joeqsmith on April 24, 2023, 12:02:06 pm ---All of the meters shown held up beyond their maximum ranges. 

--- End quote ---

This could maybe have been part of your robustness testing - how high will it go on the voltage range before it freaks out?

Fungus:

--- Quote from: floobydust on April 25, 2023, 12:04:21 am ---If there is e.g. 1mm PC board spacing (creepage and clearance), question is what (voltage) use are people here comfy with?

--- End quote ---

It's nothing to do with voltage, it's about energy.

floobydust:

--- Quote from: Fungus on April 25, 2023, 01:01:22 am ---
--- Quote from: floobydust on April 25, 2023, 12:04:21 am ---If there is e.g. 1mm PC board spacing (creepage and clearance), question is what (voltage) use are people here comfy with?

--- End quote ---

It's nothing to do with voltage, it's about energy.

--- End quote ---

What came first- the voltage creating an electric field causing an insulation breakdown and arc, or the energy behind that arc?
I say creepage and clearance largely determine a multimeter's maximum safe ("before an arc can occur") input voltage. Spacings analysis during certification with UL/CSA, they'll ask for PCB files and go through it. The high voltage tests have the final say.
My point is to look at the DT830 spacings and the astute eye will see some tight spots. Is using this on 240VAC mains outright unsafe? A reasonable question because with a "trashy" meter the risk is good to know. I keep one (DT830) in my car and a friend wants their stove checked. Use it or not?

Fungus:

--- Quote from: floobydust on April 25, 2023, 02:17:28 am ---
--- Quote from: Fungus on April 25, 2023, 01:01:22 am ---
--- Quote from: floobydust on April 25, 2023, 12:04:21 am ---If there is e.g. 1mm PC board spacing (creepage and clearance), question is what (voltage) use are people here comfy with?

--- End quote ---
It's nothing to do with voltage, it's about energy.

--- End quote ---
What came first- the voltage creating an electric field causing an insulation breakdown and arc, or the energy behind that arc?

--- End quote ---

That wasn't what you asked, you asked about "comfort".


--- Quote from: floobydust on April 25, 2023, 02:17:28 am --- Is using this on 240VAC mains outright unsafe?

--- End quote ---

I vote "no".

Proof: The amount of people who use them for that.


--- Quote from: floobydust on April 25, 2023, 02:17:28 am ---I keep one (DT830) in my car and a friend wants their stove checked. Use it or not?

--- End quote ---

It's as much about procedure as anything else, eg. triple-check the position of the selector and probe wires, give the probe wires a tug before starting, wear wellies, wear a glove on one hand, don't try and measure the amps.

robert.rozee:

--- Quote from: Fungus on April 25, 2023, 02:50:05 am ---
--- Quote from: floobydust on April 25, 2023, 02:17:28 am --- Is using this on 240VAC mains outright unsafe?

--- End quote ---
I vote "no".
Proof: The amount of people who use them for that.
[...]
It's as much about procedure as anything else, eg. triple-check the position of the selector and probe wires, give the probe wires a tug before starting, wear wellies, wear a glove on one hand, don't try and measure the amps.

--- End quote ---

number of people, not amount

regarding the use of the multimeter you happen to have handy rather than the appropriate tool, see:
https://www.ecmweb.com/safety/arc-flash/article/20898038/the-case-of-the-deadly-arc-flash


cheers,
rob   :-)

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