Electronics > Repair
HP 34401a DMM with leaking segments
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...
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version