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how do you calibrate a dvm with 6.5 digits?
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Joop01:
I'm planning the layout of my own lab, I planned for a R&S dvm HMC8012, but unfortunately it is no longer manufactured, that is that all shops no longer deliver the meter. So refocus. The HMC was 5 3/4 digit, it must be the same or better. If you make a list you end up with 5.5 or 6.5 digits meters. If you look at the specs you can read that its valid for a year. After that it won't be off that much, but after some time you need to re-calibrate, but how do you calibrate  those meters? Send it back for calibration?, which has the risk that the box is dropped on the floor or so when its send to the manufacturer (or what's available) or returned to you. This is the reason I want to do it myself, but with what? I have designed calibration stuff, but that's 0,1% at best. Those 5.5 or 6.5digit meters have a lot more 0 figures behind the decimal point. Buy two meters (from different manufacturers)?
BeBuLamar:
If I were you I either send it to the manufacturer for calibration or not having it calibrated as I don't think they change much over the years. I think you can buy the equipment to calibrate it but then they are very expensive and they need to be calibrated too.
Fungus:

--- Quote from: Joop01 on May 01, 2023, 02:40:41 pm ---This is the reason I want to do it myself, but with what? I have designed calibration stuff, but that's 0,1% at best. Those 5.5 or 6.5digit meters have a lot more 0 figures behind the decimal point.

--- End quote ---

You don't need zeros after the decimal point to see if it's changing. Measure the most stable reference you own using the meter when it arrives. Measure it again every six months using the same reference under the same conditions, see how much it changes (if at all). You might need an oven to get a stable temperature for this. :popcorn:

These meters are designed to not change with time, and they usually don't. The best bet is just to monitor it and take no action unless you think it needs it.

You could spend the first few days of ownership messing around with a trimmable voltage reference in your oven. See how many zeros you can get after the decimal point using the circuit in the datasheet.
nctnico:

--- Quote from: Joop01 on May 01, 2023, 02:40:41 pm ---I'm planning the layout of my own lab, I planned for a R&S dvm HMC8012, but unfortunately it is no longer manufactured, that is that all shops no longer deliver the meter. So refocus. The HMC was 5 3/4 digit, it must be the same or better. If you make a list you end up with 5.5 or 6.5 digits meters. If you look at the specs you can read that its valid for a year. After that it won't be off that much, but after some time you need to re-calibrate, but how do you calibrate  those meters? Send it back for calibration?, which has the risk that the box is dropped on the floor or so when its send to the manufacturer (or what's available) or returned to you.

--- End quote ---
You are overreacting here. Test equipment is shipped around all the time for calibration. Just make sure to ship it in the box + packaging it came in; that has been designed to survive any kind of transport. IOW: just send it to the manufacturer for calibration and be done with it.
coromonadalix:
Exactly same toughts,  to build you own cal lab  you need control over humidity / temperatures   etc ....   you can not play god

i always heard for a 6.5 digit    you need at least 7.5 or even 8.5 digit calibrators, and check all their used prices  lolll

better send it,  you receive the cal sheet  etc ...   and way less costly  in time or ressources
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