[volt-nuts] 3458A Calibration Education
cfharris at erols.com
Fri Nov 11 05:46:04 UTC 2011
Does your programmer have a specific setting for the Dallas chip?
The Dallas chips doen't take too kindly to having an eprom's programming
voltage applied.... which some programmers do even when reading.
J. L. Trantham wrote:
> I have successfully modified my A5 board (03458-66505) by removing the EPROM
> (U110), the two DALLAS 1230Y NVRAM's (U121 and U122), and the DALLAS 1220Y
> NVRAM (the 'CAL RAM', U132) and installing sockets at all 4 positions. In
> the process, I lost the data in the 'CAL RAM', the one chip I really wanted
> to archive. The chip seemed to read differently each time I read it using
> my BP Microsystems BP-1600 Universal Programmer and was, clearly, not what I
> would have expected. The two DALLAS 1230Y chips read consistently and I was
> able to archive their data with their data in a form I would have expected.
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