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daisizhou:
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tggzzz:
You need to consider legal and insurance consequences.

If you make a mistake and an ESU is incorrectly analysed and subsequently injures someone, who is liable to pay damages?

If there is an insurance claim and the investigation finds that a device does not have the paperwork indicating it is formally and traceably calibrated, I'll bet the insurance claim will be denied. Who is then liable to pay any damages?

In other words, you are on sinking sand :)

Brianf:

--- Quote from: daisizhou on December 04, 2022, 08:07:30 am ---...if you can understand how it is calibrated, please let me know, thanks a lot

--- End quote ---

Presumably there is a 'calibration manual' available to qualified people.

tggzzz:

--- Quote from: daisizhou on December 04, 2022, 11:00:45 am ---I have a properly calibrated ESU analyzer.And the calibration reference is the calibrated analyzer.
If certification is required, then I will use the calibrated 454a mainframe for certification, which is not a big problem. There are specialized agencies that do the certification, but they don't calibrate

--- End quote ---

You don't have to convince me.

You might have to convince insurance company loss adjusters looking to minimise a payout. And/or legal authorities.

I don't understand your distinction between "certification" and "calibration". How can something be formally certified if it isn't formally calibrated? I suspect that might be a language issue. A standard misunderstanding is that there are important differences between calibration is not adjustment.

tggzzz:

--- Quote from: daisizhou on December 04, 2022, 12:39:13 pm ---To be precise, before 2007, FLUKE was responsible for adjusting the calibration, and then the local management department was responsible for the certification.
But now I have to learn to adjust the calibration by myself, and then take it to the local management department for verification
The 454a looks like a digital multimeter to me.
According to professional laws, digital multimeters must be calibrated every year, but how many digital multimeters in your hands are actually taken to the measurement department for calibration and certification every year, so these are not problems

--- End quote ---

It doesn't matter what it looks like. What matters is what it is.

If a measurement is important, then the measuring instrument must be calibrated according to whatever schedule is specified.

If a measurement is important as far as legal authorities and/or insurance companies are concerned, then you need to be able to show that the measurement was within specified limits.

If the legal authorities and insurance companies never look, then you might skimp on the correct procedures.

But don't bother to try to convince me, since I have no interest in the answer.

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