Thanks
On Wed, Aug 20, 2014 at 7:08 PM, J. L. Trantham <[email protected]> wrote: > John, > > I don't think I would worry too much about messing up the 'CALRAM'. If you > 'mess up' the 'CALRAM', and your meter is, otherwise, OK, you will spend > about $500 with Keysight for a 'Keysight' calibration, which I would > recommend. > > If they get your meter and it is not 'suitable' for calibration (meaning > that, in some way, it's 'broken'), you will be notified and offered the > option of having them 'repair' the meter (for about $2700, which includes > the 'Keysight' calibration) or returning the meter to you for your repair > at > a cost of half the calibration charge, IIRC. > > The key point about reading these NVRAM's is to, first and foremost, let > the > chips cool after removal before trying to read them. I learned about that > the hard way. > > Second, make sure your programmer specifically supports the chip you are > trying to read and program. If so, reading then archiving the data should > be straight forward and programming a new chip should be equally straight > forward. > > I am not familiar with the 'Mem test 1 high' issue but I suspect the > Assembly Level Repair Manual or the Component Level Repair Manual should > address the issue. I agree with others that this likely means that, in > some > way, your meter is 'broken'. If you can chase that down to a simple > problem > and repair it, getting the calibration with Keysight would be the next > order > of business. Once it passes calibration, you would be able to purchase the > 'Repair Agreement' for a couple hundred dollars per year, with a discount > for multiple year purchases up to a maximum of 5, IIRC, which gives you a > meter with a 'factory warranty' for that time period. > > Personally, I would look for a 'professional' programmer rather than one of > the 'cheaper' ones, especially if you are anticipating getting into vintage > equipment and programming EPROM's, etc. BP Micro, Advin, DATA I/O, Elnec, > etc., would ones I would look for. I'm sure others on the list would have > their own recommendations. The prices on theBay right now are particularly > ridiculous but good deals can be had. The majority of these units use > parallel port connections and need WinXP as the OS. The later versions, > starting around $500 will connect via USB and be able to utilize Win7 or > Win8. > > Good luck. > > Joe > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of John Phillips > Sent: Wednesday, August 20, 2014 8:41 PM > To: Discussion of precise voltage measurement > Subject: Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K > memory chips? > > I do have a ni gpib-usb-hs > http://sine.ni.com/nips/cds/view/p/lang/en/nid/201586 > I was hoping to remove the chip, read the data with a usb programer and > wright the data back into a new chip before installing it. > Then do a full calibration. > If the 16k chip has the cal vars what do the other 32k chips have? > Thanks for the input. > I should be able to read to read the data from a good meter with the MREAD > and wright it with a programer. > > I have been using excl to read program 3458As I will see if I can get > MREAD > to work there. > > > > > On Wed, Aug 20, 2014 at 5:33 PM, Mark Sims <[email protected]> wrote: > > > You REALLY don't want to mess with that 24 pin NVRAM chip... it > > contains the calibration memory. If you bugger the data in it, you > > get to spend a couple of grand getting the meter back into working > > order. I know a couple of people that did just that. > > > > The solution is to first make a backup copy of the memory contents > > using the (undocumented) MREAD command over the GPIB bus. > > Poul-Henning Kamp figured out how to do it... buy the man a beer... even > better a case of > > beer... Search the archives for details. > > > > I just backed up all the memory in my 3 HP3458A's for when the inevitable > > BIG BAD DAY comes and the backup batteries go bye-bye. If you happen to > > have a NI GPIB-232CV-A (or possibly a Prologix) RS-232 to GPIB > > converter and can run a DOS or WIN98 program, I have a program that > > dumps the memory chips. It has code for the Prologix in it, but I've > > only used it with my a Prologix compatible unit I built... I don't > > have a real Prologix to test it with. > > > > > > _______________________________________________ > > volt-nuts mailing list -- [email protected] To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > > and follow the instructions there. > > > > > > -- > > *John Phillips* > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > -- *John Phillips* _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
