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| All about Keithley DMM7510. Bugs and features, recipes, advice, notes. |
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| Kleinstein:
--- Quote from: MegaVolt on June 27, 2020, 11:00:03 am --- --- Quote from: Kleinstein on June 26, 2020, 05:22:42 pm ---The 8.3 µs make some sense as the period of the run-up phase feedback. One is not limited to these steps, but it makes things easier. So setting the integration time in ns steps is a bit dishonest. Only 8.3 µs steps could be slightly limiting in some cases, but is not that bad. --- End quote --- Most of all, I don’t like the fact that I have to get these data and numbers myself. I cannot read them in user manual. --- End quote --- I absolutely agree with that. With modern instruments the manuals get increasingly confusing and the specs get unclear, missing details or the relevant part to compare different products. For the DMM7510 I can absolute understand that they don't want to show the 100 PLC noise. So the specs tend to leave out the weak points. In part this is because of the flood of new features and options and planed additions to the software. So they have to release a manual before the software is really ready (if it ever gets :horse:). Fixing the bugs is usually slow and updating the manuals is usually even slower. When writing instructions one tends to focus on the new / special features, so one may miss one the classical important part. The manual is already quite long and is still missing quite a bit on app programming. |
| MegaVolt:
Yes that's right :( At the expense of noise in my opinion the data is outdated. I'm busy measuring noise right now. Soon I will share the results. |
| MegaVolt:
I found that DCV noise in the 0.1V range changes little until the integration time is 0.007s It became interesting to me how this noise looks and it looks like a certain periodic signal :( Aperture = 0,000475 s |
| MegaVolt:
During the night I collected more data and there is a similar generation for long integration times. For example, here is a picture for NPLC = 8.5. And similar pictures for all times of integration of a kind 5.5; 6.5; 7.5; It looks like a network frequency. |
| Kleinstein:
Using things like 7.5 PLC makes the meter sensitive to mains hum (50 Hz, but not 100 Hz). Due to the time needed for rundown, there is a beat frequency and this would be visible. So the amplitude seen here is likely from the 50 Hz hum. This is why the preferred modes are integer PLC numbers. For the much faster test in the digitizing mode one may see residues of ripple from an chopper OP too. |
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