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Average measuring multimeters more precise than TrueRMS counterparts?

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bdunham7:

--- Quote from: radiolistener on January 22, 2023, 01:14:45 am ---The difference between TRMS and average measurement of mains can be up to 100 Volts.

--- End quote ---

That would be pretty extreme to be off 43%.   An average-responding, sine-RMS-adjusted (multiplied by ~1.11 as all of them do) will be off by 11% for a square wave and 4% for a triangle wave.  Even if you put rectifier in the line for a half-wave sine, that would only be a ~28% error.  I doubt your mains are that bad!

Fungus:

--- Quote from: nightfire on January 21, 2023, 09:18:31 pm ---why quite similar multimeters a) exist other than for some marketing reasons

--- End quote ---

People buy them, so ... Fluke makes them

Like many things "Fluke" I suspect it's just old procedures/clients who don't want to change their system.


--- Quote from: nightfire on January 21, 2023, 09:18:31 pm ---and b) if it has some technical benefit

--- End quote ---

No.

radiolistener:

--- Quote from: bdunham7 on January 22, 2023, 01:42:52 am ---I doubt your mains are that bad!

--- End quote ---

When rocket or a bomb hits some building in the city it often leads to a high Voltage change in the mains, later - after a couple of seconds you can hear a strong air shock wave from the blast, if it happens too close shock wave can break glass in home windows or even knock out windows entirely, but first you can see it as a high Voltage change in the mains. It often leads to burn out home electronics, such as induction stove on kitchen. Some people was seen over 320 Volts in the mains and its duration was more than minute.

It's a good idea to buy overvoltage/undervoltage protection switch in order to protect your home electronics.

Electro Detective:
320 volts reading on an averaging meter or RMS?

Analogue or digital meter?

Peak readings perhaps?

Is it 320 volts in a 120v area

or 220v ?

or 230/240v ?


Either way only correctly rated fast blow mains fuses have a chance to save anything at 320 volts RMS for 'more than a minute'

and they need to do that in nanoseconds, not under or within a minute

or it's game over for home electronics.


Quote radiolisterner:
"It's a good idea to buy overvoltage/undervoltage protection switch in order to protect your home electronics."

It better be  FAST sensing and acting switch, with repetitive performance,
not just 'one or two surges and BANG!..'


HKJ:

--- Quote from: Electro Detective on January 29, 2023, 09:40:20 am ---320 volts reading on an averaging meter or RMS?

Analogue or digital meter?

Peak readings perhaps?

Is it 320 volts in a 120v area

or 220v ?

or 230/240v ?


Either way only correctly rated fast blow mains fuses have a chance to save anything at 320 volts RMS for 'more than a minute'

and they need to do that in nanoseconds, not under or within a minute

or it's game over for home electronics.

--- End quote ---

You can easily get 320V or more (in 230V countries) if the neutral wire is broken.

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