Not only battery backed up SRAM but EEPROM config data has problems. I'm a
bit of a mass nut and have seen lots of old precision balances (i.e. Sartorious
and Mettler) that used first gen serial EEPROMs to save their cal/config data.
Lots of these are going senile. I had to build
Hi
The coin cell / backup battery swap out is something we probably will become
more familiar
with on a *lot* of gear. The battery backed up RAM idea is now old enough that
there is a large
population of test gear / radios / telecom gear out there with this “feature”.
In some cases the
loss
I once got in around 20 Tek DM5?? GPIB DVM modules for the TM5000 series
mainframes. They have a rechargeable nicad pack soldered to the circuit board.
All the meters still had good cal data but the cells were on their way out.
The meters are a pain to re-calibrate...
I used a DIP clip
Bob,
To illustrate your point.
The original PM6681 calibration setup includes a PC, an ancient Philips
ISA-bus GPIB interface and an ancient Philips driver and a DOS program.
Collecting these and put them together to work will be an interesting
challenge.
A more modern variant of the
