Timeline for precision voltage reference for multimeter
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
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| Jul 16, 2016 at 21:20 | comment | added | user57037 | I don't think you missed anything. Somehow over the years I have acquired a bunch of meters, some handheld some benchtop. I guess they would be pretty expensive to buy new now. But if you have that fluke, my thinking is you probably don't need to calibrate it. If you do, you should definitely follow-up and post your results and conclusions. | |
| Jul 16, 2016 at 21:06 | comment | added | Aaron | I have a fluke 115, I believe it only measures to the millivolts. Both the lm4040 and the lt1236 are rated to .1%. That would leave variation for +/- 1mV. The flukes accuracy is stated at .5%. But I hear they are usually more accurate than stated. Did I miss something? | |
| Jul 16, 2016 at 20:41 | comment | added | user57037 | Hmmm, which is more reliable, a reference you build, or the multimeter? Personally, I would trust the multimeter more than the reference. At least if it is a good one. If my meter said 5.0001V, I wouldn't suspect that my meter was wrong. I would suspect that the reference was off by 100uV. You will need to buy very high specification parts to make sure you are not off by 100uV. | |
| Jul 16, 2016 at 19:13 | comment | added | Aaron | Oh no haha, I'm using it as a voltage reference to calibrate it. Should have specified | |
| Jul 16, 2016 at 19:12 | comment | added | user57037 | Why does the title/subject say "for a multimeter?" Are you designing a multimeter? It will be much easier and probably cheaper to buy one. FYI. It could still be a good experience to design one, of course. | |
| Jul 16, 2016 at 16:01 | answer | added | FiddyOhm | timeline score: 1 | |
| Jul 16, 2016 at 13:58 | comment | added | Peter Smith | Aaron: it is a common issue to find that references are considered 'purely DC' but that simply is not so. As they must respond to variations in load and supply, they have ac (or transient) characteristics (and the LT1236 can be unstable at low loads). | |
| Jul 16, 2016 at 11:29 | history | edited | Dave Tweed | CC BY-SA 3.0 |
appended answer 246298 as supplemental
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| Jul 16, 2016 at 9:25 | comment | added | winny | Which version are you using? | |
| Jul 16, 2016 at 8:37 | comment | added | Aaron | Datasheet link in the question if you have time :) maybe I underestimated the effort required to help my lost soul | |
| Jul 16, 2016 at 8:36 | comment | added | Aaron | It has an applications information section. And it talks about pin impedance on the trim pin and then something about source impedance. I don't really understand, this is purely a DC circuit. I do know it wants me to put a pot on there. But how would I know that its at 5.000v? | |
| Jul 16, 2016 at 8:33 | comment | added | winny | What does the data sheet say? | |
| Jul 16, 2016 at 8:12 | review | First posts | |||
| Jul 16, 2016 at 9:37 | |||||
| Jul 16, 2016 at 8:12 | history | asked | Aaron | CC BY-SA 3.0 |