Again, during the last test where the DC had been removed, the meter was set to VFD. The bargraph will be disabled, the filter will be active causing a bit of an voltage difference for the higher frequency content waveforms and yes, it only displays two places past the decimal point. We can see this on page 24.
Is it worth repeating this test with the VFD disabled? I could also just run two meter and remove the DSO, maybe slow it down a bit further to make it easier to track. We could also increase the number of waveforms. This test requires little effort to setup so if you feel it's worth it, let me know.
I am still not sure what the comment was about UNI-T not having a problem. I could toss the 87V into the mix as well if this is what you want to see. It just gets more difficult for me anyway, to follow what is going on with so many devices active at once.
Hi Joe,
If it is not big effort and you're willing to do it, sure, it would be nice.
It would be nice to see limits of this, and maybe with what waveforms it will happen. I doubt autoranging will have problem with standard waveforms...
Maybe see it through full range (6V, 60V, 600V) ... Definitely check whether it is VFD related.
I personally don't think it is a major problem, it measures correctly, shows correct value, it simply didn't show max resolution. But it is not dangerous, like showing 4V when there is 232V being measured. And if you are measuring and this shows, you know what the problem is and can manually range if needed. That last digit is not accurate on AC anyways ...
But sure, if it can be fixed, it will be "betterer".
As for comparison with other meters, on that topic I have the opinion that you should strive to be as good as you can, not legitimize mediocrity by being as bad as others ("if Fluke doesn't do better, we don't have to" mentality...). It might be educational to see how some other meters cope with it, just because it is not hard to simply add them into frame once you take effort to create setup.
Regards,
Sinisa