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| acinho:
I'm calibrating various lab instruments in the field. The procedure that I follow recommends 5 1/2 digit multimeter with a >10 MOhm input impedance. Gossen Metrahit 30M satisfies these requirements but it's no longer available so I use Fluke 8846A. It's a bench multimeter and cumbersome to carry around and so I'm looking for something more portable. 500000 count Brymen 869s caught my eye but I'm not sure it's accurate enough, 0.02% + 20d in the 500000 count mode. Are there more accurate alternatives that are for sale? It doesn't have to be a handheld multimeter, just small enough that I can carry it in a backpack. |
| Fungus:
--- Quote from: acinho on July 26, 2022, 07:14:23 pm ---500000 count Brymen 869s caught my eye but I'm not sure it's accurate enough, 0.02% + 20d in the 500000 count mode. --- End quote --- That's the outer limit accuracy across the full temperature range of the meter. You should find it's a lot better than that at standard room temperature. People have tested this and found the error to be more like 2-3 digits: https://www.eevblog.com/forum/testgear/bymen-bm869-measurement-of-dcv-linearity/msg384188/ https://www.eevblog.com/forum/testgear/brymen-bm869-and-bm867-batch-calibration-check/ The real problem is that that for more digits you need a temperature controlled voltage reference (ie. a small oven inside the meter) to get more digits. You won't find it one in a battery powered meter because it would drain the batteries in no time. If you're calibrating at certain fixed voltages you could also compare the 500,000 count Brymen to your Fluke and know/compensate the error (if there is one). |
| acinho:
I plan on doing side by side comparison in the field. |
| alm:
Is characterizing the error yourself over the range of environmental conditions and time yourself acceptable in your process? Or do you need to rely on manufacturer specifications? Could you measure relative to a more accurate standard? Like make a differential voltmeter out of a PDVS2 + a multimeter as null meter? Of course this would be more cumbersome. |
| Fungus:
--- Quote from: acinho on July 27, 2022, 05:58:05 am ---I plan on doing side by side comparison in the field. --- End quote --- Good idea. Take a Brymen and your Fluke for a while, see if they agree. (and be sure to post about it here!) |
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