| Electronics > Repair |
| HP 34401a DMM with leaking segments |
| << < (21/45) > >> |
| qu1ck:
--- Quote from: Samogon on July 27, 2018, 04:13:32 pm --- --- Quote from: hillflyer on July 27, 2018, 02:10:45 pm ---How about displaying the 1 or 2 extra digits that are available via GPIB or RS232? --- End quote --- Since he is getting data given to front panel i think it is not possible. --- End quote --- Correct. Also what's the point? I didn't know more digits are available on GPIB but they can't be meaningful digits, can they? At given sampling rate front panel already displays every digit of resolution the instrument has. |
| coromonadalix:
Don't get too over complicated lolll |
| hillflyer:
I agree with not getting too complicated. I do think the extra digits provide some meaningful information though. The graph shows my quiet 2.5V reference on the 10V range of the 34401a. |
| qu1ck:
That's interesting, that looks like 8 digits on 10v range. How can you be sure that isn't just ADC noise? Either way, I can't do anything about adding those digits, that information is not sent to front panel. |
| hillflyer:
Yeah, no problem. :) Re. ADC noise: In 6 1/2 digit slow mode, it looks like there is about 2uV p-p noise incl. the reference noise. I use 5 paralled MAX6325 for lower noise. I am sure you cannot rely on the long term accuracy of these extra digits, but sometimes it is helpful to be able to squeeze a bit of extra info out of that measurement if needed... |
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