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| Fluke 28 II VREF output |
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| Bobson:
https://youtu.be/CiXD6wo3cLc?si=bJQ7H2PEl54es9-t&t=1442 You can see 2.497v coming out between COM and V sockets. My 28 II generates exactly the same voltage. Probably it is just LT1790 VREF voltage connected to these sockets. Wonder how stable is it and if does it work with 87 V and is it the same with different samples. |
| Bobson:
Anybody with Fluke 87 DMMs could report results? |
| AVGresponding:
That's not from the LT1790, unless there's a serious fault. More likely it's stray voltage from the diode test mode you have to switch past. Try selecting DC while in current mode then going back to AC. You should now get a reading of zero, or near enough. |
| Bobson:
--- Quote from: AVGresponding on December 02, 2023, 08:46:19 pm ---That's not from the LT1790, unless there's a serious fault. More likely it's stray voltage from the diode test mode you have to switch past. Try selecting DC while in current mode then going back to AC. You should now get a reading of zero, or near enough. --- End quote --- Wrong. Diode mode has +2.375V, while in AC mA it has -2.497V. After switching to DC mA 0.0V, and returns to -2.4975V after going to AC mA back. So it is definitely not a charge after Diode, it stays stable. |
| J-R:
--- Quote from: Bobson on December 02, 2023, 07:41:55 pm ---Anybody with Fluke 87 DMMs could report results? --- End quote --- 87V: 2.0912V using V jack in combination with any of the other jacks. |
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