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how do you calibrate a dvm with 6.5 digits?
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Joop01:

--- Quote from: bdunham7 on May 01, 2023, 07:49:55 pm --- have no idea why you think that nothing can ever be shipped--how do you get your new meters?  If getting a new meter is the only way you can get something without it being smashed, just buy a new meter every year or two, depending on your calibration cycle.  It will be way cheaper, especially if you sell your old one.

--- End quote ---
First question, jump in my car and drive to the reseller. I have a special floor in the car for transporting equipment. Second remark, thanks, figured out the same thing. I have downloaded a service manual for a dvm and what you need to do the job. As said before, that's way above what I want to spend. Second hand somewhere between 60.000 and 75000 dollars, so new will be much more. Also with so much figures behind the decimal point I think you can safely ommit the last two. Also I agree with you that you can buy a new every two years, prices are dropping due to some genius in China who put all in one chip. 
Joop01:

--- Quote from: Fungus on May 01, 2023, 08:01:14 pm ---Yeah, is this calibration needed for legal reasons or are you just doing it as a hobby?
As noted, these things are designed not to go out of calibration. Maybe all you need is a way to convince yourself of that fact.

--- End quote ---
No, I'm just a hobbyist who happens to have a hobby with equipment which is not available on the market. Your second remark, I could not find specs  for a period longer than 1 year. I think your right.
Martin72:

--- Quote ---Back to my question, if it is not possible to calibrate your own equipment, then what is the point in having, say, a 6.5 digit bench multi meter?
--- End quote ---

It never occurred to me to calibrate my measuring instruments myself, because I simply do not have the means to do so and do not want to buy them.
It is much easier and cheaper to have them calibrated externally.
If it were necessary in the hobby area.
I had once exemplary done and my Brymen 869S calibrated externally (cost 79 €).
In the "Pro" area it looks different, we have to calibrate all our measuring equipment annually.
If we had them calibrated to the DakkS standard, we could extend the time between calibrations.
But it is enough to have them calibrated according to ISO with equipment calibrated according to DakkS.
Why do you need the accuracy of a 6.5 digit meter in the private sector, that is another question.
If I have to measure something to three decimal places, then it doesn't matter whether my 6.5 digit meter is calibrated or not.
bdunham7:

--- Quote from: Joop01 on May 01, 2023, 10:09:03 pm ---First question, jump in my car and drive to the reseller. I have a special floor in the car for transporting equipment.

--- End quote ---

Well, depending on where you are, Tektronix Eindhoven seems driveable, at least to me, and they likely can recalibrate your meter.  If that isn't driveable, buy a Pelican case for it.  I have these for my better handheld and my best bench meter so that they can travel with an almost indestructable shield.  I doubt any reasonable courier service would destroy a fairly light and well protected package like that on such a short trip--it's usually the heavy ones that get slammed.

https://www.tek.com/en/calibration-services/netherlands/eindhoven

If you buy a new Keithley DMM6500, it has a 2-year calibration cycle (at slightly worse specs than 1 year) and is actually pretty unlikely to go out of spec even over a decade.  One ISO-17025 calibration after two years should convince you of that.

https://download.tek.com/datasheet/1KW-61315-1_DMM6500_Datasheet_072121.pdf
Someone:

--- Quote from: Martin72 on May 01, 2023, 10:26:43 pm ---In the "Pro" area it looks different, we have to calibrate all our measuring equipment annually.
--- End quote ---
all ? at places I have worked the safety and compliance bits were kept calibrated but the rest didn't matter. Where "the rest" could be 99% of the equipment and never less than half.
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