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Discussion of precise voltage measurement

HP3458A calibration memory backup

Mark Sims

Thu, Aug 7, 2014 6:24 AM

Unfortunately, I accidentally over-wrote the files where the data was changing when I gave my dumping program batch file the wrong file name... but it was MREAD location 60ECA (RAM byte offset 0765). On one dump it was 01 and another it was 05. I didn't write down what it was the other time. On the dumps, the second and fourth dumps were different from the first one, the third and first were the same (and I think the value stabilized at 01). I have the machine powered off and am going to try again and see if it still changes. Previously the machine had been off for a couple of months.
There is a possibility it was a glitch in the GPIB-RS232 conversion... but the location was always the same one.

If you mail those files to me, I can try to see if that bit matters.

Unfortunately, I accidentally over-wrote the files where the data was changing when I gave my dumping program batch file the wrong file name... but it was MREAD location 60ECA (RAM byte offset 0765). On one dump it was 01 and another it was 05. I didn't write down what it was the other time. On the dumps, the second and fourth dumps were different from the first one, the third and first were the same (and I think the value stabilized at 01). I have the machine powered off and am going to try again and see if it still changes. Previously the machine had been off for a couple of months. There is a possibility it was a glitch in the GPIB-RS232 conversion... but the location was always the same one. ------------------------ >If you mail those files to me, I can try to see if that bit matters.

Poul-Henning Kamp

Thu, Aug 7, 2014 6:38 AM

In message BLU170-W124ED5EA748A7038AFDE927CEE10@phx.gbl, Mark Sims writes:

As far as I know, that is an unused area of the CALRAM, so the
difference could seem to indicate that your CALRAM battery is on
its last legs...

--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.

-------- In message <BLU170-W124ED5EA748A7038AFDE927CEE10@phx.gbl>, Mark Sims writes: >Unfortunately, I accidentally over-wrote the files where the data >was changing when I gave my dumping program batch file the wrong >file name... but it was MREAD location 60ECA (RAM byte offset >0765). On one dump it was 01 and another it was 05. I didn't write >down what it was the other time. As far as I know, that is an unused area of the CALRAM, so the difference could seem to indicate that your CALRAM battery is on its last legs... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.