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| Fluke 8050A calibration |
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| med6753:
As I've stated before you can play with the resistor values as stated in table 4-10. Then do a complete DCV re-cal and see where it's at. If it's unacceptable you can reverse it. Some drift up to a half hour is normal for any 4.5 digit DMM. |
| Martian Tech:
Assuming I'm reading the schematic correctly, here's what I don't understand: If it's accurate on the 200mV scale, it should be accurate on the 20V scale as well. They both use the x10 buffer gain, and on the 20V and 200V scales, the input signal is divided by 100 by U1(1,2), R5, U1(3,4). So on the 200mV and 20V scales, 0-200mV is presented to the buffer and multiplied by 10 to present 0-2V to the integrator. On the 2V and 200V scales, 0-2V is presented to the buffer and multiplied by 1 to again present 0-2V to the integrator. If the divide by 100 is inaccurate, both the 20V and 200V ranges should be off. If the x10 multiplier is off, both the 200mV and 20V ranges should be off. Could it be something as simple as oxidation on the switch (S7) contacts in the 20V range? |
| bob91343:
Well I never checked the 200 mV or 200 V ranges so that's my next step. It may be that a full adjustment will fix everything. |
| med6753:
--- Quote from: bob91343 on July 31, 2020, 03:52:21 am ---Well I never checked the 200 mV or 200 V ranges so that's my next step. It may be that a full adjustment will fix everything. --- End quote --- Well, that would explain your issue and you should have stated right from the get go that you did not attempt to calibrate to other ranges. Follow the DCV calibration procedure as stated in the manual in the order given. But obviously you may not have access to an accurate 1000V source so that range can be left alone. |
| Fungus:
--- Quote from: med6753 on July 31, 2020, 08:55:08 am ---But obviously you may not have access to an accurate 1000V source so that range can be left alone. --- End quote --- All you need is enough 9V batteries... :) |
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