MULTIMETER ISOTECH IDM 207 - Page 1
Forum section: electronics / general

author: lionelkjh
author_rank: Frequent Contributor
timestamp: December 16, 2022, 02:57:52 pm
content: Hi there! I am looking for the contents of memory 93C66 (EEPROM, pinout: SOP-8), on ISOTECH IDM 207 table multimeter (photo). Could someone provide it to me with the correct content (because someone on this site unfortunately gave me a foreign file for my multimeter)?? I thank you very much for your dedication to all!!

author: Kleinstein
author_rank: Super Contributor
timestamp: December 16, 2022, 05:46:31 pm
content: Chances are the EEPROM would mainly contain the CAL constants. By design they are valid for the individual meter only and there is not that much sense inusing wrong constants.About the only good reason would be as a starting point to do a new calibration in case one needs at least a valid data format / check sum to start with. With a little luck a empty chips is also detected as empty - this would help manufacturing.

author: lionelkjh
author_rank: Frequent Contributor
timestamp: December 16, 2022, 05:57:33 pm
content: Thank you for this return; but alas, I don't have the connection cable to go to the computer, nor the big calibrator, that's why I'm looking for the contents of the memory that will help me temporarily to repair it, rather than throwing it away . In France nobody seems to want to calibrate ISOTECH....

author: Kleinstein
author_rank: Super Contributor
timestamp: December 16, 2022, 06:03:38 pm
content: What are the symptoms with the current memory content ?Replacing the memory content would not be an alternative to a calibration.It would only help of the current contend is badly corrupted causing some error (mainly an error message or maybe 0 scale factor), so that one can not do a calibration from this state.

author: lionelkjh
author_rank: Frequent Contributor
timestamp: December 16, 2022, 06:09:07 pm
content: the contents of the memory are empty, the multimeter displays "OL"; I first looked at the memory with the TL866, and the result is clear!

author: lionelkjh
author_rank: Frequent Contributor
timestamp: December 16, 2022, 06:43:47 pm
content: a question haunts me: how to explain that the memory is lost all its calibration content? An overvoltage on an input?

author: Kleinstein
author_rank: Super Contributor
timestamp: December 16, 2022, 07:17:32 pm
content: Is it reading OL in all ranges ?A simple overvoltage at the input should not erase the memory. It would be more a bad memory chip or maybe the internal µC for some reason (e.g. brown out) overwriting things that it should not. A frimware update that when wrong would be a possibility. Another reason could be a try to enter calibration function and somehow abort / power down at just the wrong time.With a constant OL reading due to missing CAL constants could be one of the few cases where a coppied momory may actuall help.

author: lionelkjh
author_rank: Frequent Contributor
timestamp: December 16, 2022, 07:37:39 pm
content: the multimeter has not undergone a power surge, it has not had an update carried out, and the calibration menu is not accessible via the front menu on the front panel (only by putting the dedicated socket on the dialog to the computer). The multimeter indicates "OL" on all functions, and the reading of the eeprom indicates that it is completely empty with the TL866 programmer (display of FFFF on all boxes)

author: JB2024
author_rank: Newbie
timestamp: February 12, 2024, 11:41:19 am
content: Hi,I am aware that this subject is very old, maybe totally obsolete, but I just noticed that this problem concerning an ISO-TECH IDM407 multimeter was related to the eBay seller specified in the photo (I suppose?).I have just ordered an identical multimeter from this seller (seller reference R119 with mutiple items to sell) and I fear that my product may have the same problem. Could you please confirm me whether your product comes from the seller related to this photo? Thanks in advancehttps://www.ebay.fr/itm/285601149014?hash=item427f27b056:g:cfMAAOSwlrJldgz-&autorefresh=true

author: J-R
author_rank: Super Contributor
timestamp: February 12, 2024, 08:08:31 pm
content: lionelkjh claims his has a fault and shows OL in all functions. I think he was just showing a sample photo so everyone could see what it looks like. So the one in the eBay listing you posted doesn't appear to have that issue.

author: Bobson
author_rank: Regular Contributor
timestamp: February 13, 2024, 04:56:56 pm
content: There is an APPA WinCal calibrartion software somewhere here at EEVBLOG's forum. It can work with this model, but you'll need USB interface.