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| Advantest R6871E-DC 6.5digit DMM Overview/Teardown |
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| ve7xen:
Oops. I got rid of PHP on that server and moved to a static blog generator. The gallery got lost in the crossfire, since it ran on PHP. I've thrown them back up with a basic directory listing: https://www.ve7xen.com/gallery/v/advantest-r6871e/ Unfortunately the thumbnails in the OP are gone and I won't be able to easily recreate them. |
| HighVoltage:
There are some very interesting pictures. Thank you for re-uploading |
| kipp:
Your post was many years ago now, you probably don't care anymore or have figured it out, but since it hasn't been answered here, in case someone else is reading it: The battery is not for calibration constants, as you say the instrument has EEPROMs for that. The battery keeps enough RAM powered to store the instrument's state across power cycles. It maybe powers one chip. E.g., averaging configuration, math functions, whatever, however you had it set up, the battery is for saving that. You can pull it and replace it without worries (mostly), you'll just have to re-enter your config. You should be able to live without the battery at all if you don't care that the instrument is reset to default settings every time you power cycle it. The only hiccough is that when you put in the new battery, or power it without the battery, the RAM will power back up with its contents scrambled (not cleared, random). There is a good chance this will confuse the instrument (the data will not correspond to a valid configuration) and it will refuse to function. It'll get stuck on one of the messages it displays while booting. In that case you need to find the instrument reset key sequence in the documentation and use that to manually wipe it back to default settings. Advantest has a table of the reset sequences for their instruments somewhere online. |
| ve7xen:
Thanks kipp! Very useful and interesting information. I guess they chose to do it this way to save write cycles on the EEPROM. They were thinking of longevity of this instrument :clap:! So far I haven't done anything with the battery and the instrument still seems to be working fine, but now I don't have to worry about losing cal constants if it ever goes out. |
| beanflying:
Thanks for the videos and info. I just scored one of evilbay. They are HUGE compared to my 34401a ;) Did you ever do any good with the service manual? In particular mine came set for 100V operation while we run 240V locally so an idea of links or jumper settings to make this happen is what I am after specifically. |
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