[volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
I'm porting over my HP3458A NVRAM data dumper program to use John Miles GPIBKIT routines. It should make it usable with most GPIB interfaces out there and be able to run under more modern versions of Windoze. My first crack at it is working, but it is quite a bit slower than my original program. Not sure if anything can be done about that... BTW, my program does verify the checksum bytes in the CAL ram so there is a check that the dump went OK. Without Poul-Henning's work none of this would be possible. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
Mark, Would love to try it. I think the main reason to hang onto the calibration data is to be able to send the meter to Keysight and find out if the meter was 'in spec' when it arrived for calibration. If so, gives great confidence that the meter is a 'good one'. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of Mark Sims Sent: Thursday, August 21, 2014 1:53 AM To: volt-nuts@febo.com Subject: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? I'm porting over my HP3458A NVRAM data dumper program to use John Miles GPIBKIT routines. It should make it usable with most GPIB interfaces out there and be able to run under more modern versions of Windoze. My first crack at it is working, but it is quite a bit slower than my original program. Not sure if anything can be done about that... BTW, my program does verify the checksum bytes in the CAL ram so there is a check that the dump went OK. Without Poul-Henning's work none of this would be possible. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
Mark, I just ordered the ProLogix USB-GPIB converter specifically to read the contents of my 3458A. Would it be possible to get a copy of your program that you wrote to read the memory contents. It would be greatly appreciated and save me a lot of work and frustration. thanks, Randy On Wed, Aug 20, 2014 at 5:33 PM, Mark Sims hol...@hotmail.com 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 -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
Mark, What language/development environment are you using to read 3458A memory? On Thu, Aug 21, 2014 at 6:27 AM, J. L. Trantham jlt...@att.net wrote: Mark, Would love to try it. I think the main reason to hang onto the calibration data is to be able to send the meter to Keysight and find out if the meter was 'in spec' when it arrived for calibration. If so, gives great confidence that the meter is a 'good one'. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of Mark Sims Sent: Thursday, August 21, 2014 1:53 AM To: volt-nuts@febo.com Subject: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? I'm porting over my HP3458A NVRAM data dumper program to use John Miles GPIBKIT routines. It should make it usable with most GPIB interfaces out there and be able to run under more modern versions of Windoze. My first crack at it is working, but it is quite a bit slower than my original program. Not sure if anything can be done about that... BTW, my program does verify the checksum bytes in the CAL ram so there is a check that the dump went OK. Without Poul-Henning's work none of this would be possible. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com 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 -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
[volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
Hi, I have removed my 32k memory chips form my 3458A. Doe anyone have an easy way to connect them to a windows computer. USB would be my preferred connection to a 28 and 24 pin socket. I would like to be able to read and write to the chips to validate the data. I have replace the chips and still get Mem test 1 High on start up. I really do not want to spend close to $3000 for KeySight to fix this. -- *John Phillips* ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
Yes they are DEI220Y-150 and DSI230Y-150 On Aug 20, 2014 4:09 PM, J. L. Trantham jlt...@att.net wrote: John, Which chips are these? Dallas NVRAM's? Do you have a part number? They can probably be read and programmed with the appropriate chip programmer. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of John Phillips Sent: Wednesday, August 20, 2014 3:54 PM To: Discussion of precise voltage measurement Subject: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? Hi, I have removed my 32k memory chips form my 3458A. Doe anyone have an easy way to connect them to a windows computer. USB would be my preferred connection to a 28 and 24 pin socket. I would like to be able to read and write to the chips to validate the data. I have replace the chips and still get Mem test 1 High on start up. I really do not want to spend close to $3000 for KeySight to fix this. -- *John Phillips* ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
John, Don't forget to measure your 5V power supply output. I doubt you are having a problem with it but the NVRAM write is disabled below a certain voltage (~4.25v) Todd On Wed, Aug 20, 2014 at 6:50 PM, acb...@gmx.de wrote: the easy way to read nvram through usb is a usb-programmer that has your ram in its list of supported devices:-) this will not solve your problem though. if you reboot the unit after the first error messsage, amd the problem still exists, it is probably not with the nvram. then it could be things like bus drive, chip select logic... ne way to avoid spending 3k is to bus the cpu board, this is cheaper. Gesendet: Mittwoch, 20. August 2014 um 22:37 Uhr Von: John Phillips john.philli...@gmail.com An: Discussion of precise voltage measurement volt-nuts@febo.com Betreff: Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? Yes they are DEI220Y-150 and DSI230Y-150 On Aug 20, 2014 4:09 PM, J. L. Trantham jlt...@att.net wrote: John, Which chips are these? Dallas NVRAM's? Do you have a part number? They can probably be read and programmed with the appropriate chip programmer. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of John Phillips Sent: Wednesday, August 20, 2014 3:54 PM To: Discussion of precise voltage measurement Subject: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? Hi, I have removed my 32k memory chips form my 3458A. Doe anyone have an easy way to connect them to a windows computer. USB would be my preferred connection to a 28 and 24 pin socket. I would like to be able to read and write to the chips to validate the data. I have replace the chips and still get Mem test 1 High on start up. I really do not want to spend close to $3000 for KeySight to fix this. -- *John Phillips* ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
Thanks... I have been looking at the http://www.ebay.com/itm/Universal-EEPROM-Flash-SPI-BIOS-24-25-BR90-93-USB-Programmer-6000-CHIPS-SP8-B-/371031966902?pt=LH_DefaultDomain_0hash=item56633a84b6 Do you think that would do the chips? On Wed, Aug 20, 2014 at 4:25 PM, Todd Micallef tmical...@gmail.com wrote: John, Don't forget to measure your 5V power supply output. I doubt you are having a problem with it but the NVRAM write is disabled below a certain voltage (~4.25v) Todd On Wed, Aug 20, 2014 at 6:50 PM, acb...@gmx.de wrote: the easy way to read nvram through usb is a usb-programmer that has your ram in its list of supported devices:-) this will not solve your problem though. if you reboot the unit after the first error messsage, amd the problem still exists, it is probably not with the nvram. then it could be things like bus drive, chip select logic... ne way to avoid spending 3k is to bus the cpu board, this is cheaper. Gesendet: Mittwoch, 20. August 2014 um 22:37 Uhr Von: John Phillips john.philli...@gmail.com An: Discussion of precise voltage measurement volt-nuts@febo.com Betreff: Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? Yes they are DEI220Y-150 and DSI230Y-150 On Aug 20, 2014 4:09 PM, J. L. Trantham jlt...@att.net wrote: John, Which chips are these? Dallas NVRAM's? Do you have a part number? They can probably be read and programmed with the appropriate chip programmer. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf Of John Phillips Sent: Wednesday, August 20, 2014 3:54 PM To: Discussion of precise voltage measurement Subject: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? Hi, I have removed my 32k memory chips form my 3458A. Doe anyone have an easy way to connect them to a windows computer. USB would be my preferred connection to a 28 and 24 pin socket. I would like to be able to read and write to the chips to validate the data. I have replace the chips and still get Mem test 1 High on start up. I really do not want to spend close to $3000 for KeySight to fix this. -- *John Phillips* ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com 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 -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
John, Look for the TL866A. You can get it with/without adapters. It seems to be a decent programmer. There was a review done on EEVBlog for a similar model without the ICSP port. The support list includes the 3458A NVRAM. http://www.eevblog.com/forum/blog/eevblog-411-minipro-tl866-universal-programmer-review/ I use this one ... http://www.mcumall.com/comersus/store/comersus_viewItem.asp?idProduct=4282 It works fine with the 3458A NVRAM, but you can probably save some $$ going with a less expensive model. Todd On Wed, Aug 20, 2014 at 7:43 PM, John Phillips john.philli...@gmail.com wrote: Thanks... I have been looking at the http://www.ebay.com/itm/Universal-EEPROM-Flash-SPI-BIOS-24-25-BR90-93-USB-Programmer-6000-CHIPS-SP8-B-/371031966902?pt=LH_DefaultDomain_0hash=item56633a84b6 Do you think that would do the chips? On Wed, Aug 20, 2014 at 4:25 PM, Todd Micallef tmical...@gmail.com wrote: John, Don't forget to measure your 5V power supply output. I doubt you are having a problem with it but the NVRAM write is disabled below a certain voltage (~4.25v) Todd On Wed, Aug 20, 2014 at 6:50 PM, acb...@gmx.de wrote: the easy way to read nvram through usb is a usb-programmer that has your ram in its list of supported devices:-) this will not solve your problem though. if you reboot the unit after the first error messsage, amd the problem still exists, it is probably not with the nvram. then it could be things like bus drive, chip select logic... ne way to avoid spending 3k is to bus the cpu board, this is cheaper. Gesendet: Mittwoch, 20. August 2014 um 22:37 Uhr Von: John Phillips john.philli...@gmail.com An: Discussion of precise voltage measurement volt-nuts@febo.com Betreff: Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? Yes they are DEI220Y-150 and DSI230Y-150 On Aug 20, 2014 4:09 PM, J. L. Trantham jlt...@att.net wrote: John, Which chips are these? Dallas NVRAM's? Do you have a part number? They can probably be read and programmed with the appropriate chip programmer. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto: volt-nuts-boun...@febo.com] On Behalf Of John Phillips Sent: Wednesday, August 20, 2014 3:54 PM To: Discussion of precise voltage measurement Subject: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? Hi, I have removed my 32k memory chips form my 3458A. Doe anyone have an easy way to connect them to a windows computer. USB would be my preferred connection to a 28 and 24 pin socket. I would like to be able to read and write to the chips to validate the data. I have replace the chips and still get Mem test 1 High on start up. I really do not want to spend close to $3000 for KeySight to fix this. -- *John Phillips* ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com 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 -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
That is very helpful Bill! Thanks so much... You are the first person who has told me of actually getting this to work. I have been changing out the chips one at a time. I still have the 16K chip to go. It could just be that one. I am waiting for a 24 pin socket which should be here Friday to change it out. I have been looking at the programer to see if I could get a before and after memory dump mostly to see what changed and to see if I use different chips if I get different values. 5V = 5.06 with 1.5mv ac Thanks again. On Wed, Aug 20, 2014 at 4:43 PM, John Phillips john.philli...@gmail.com wrote: Thanks... I have been looking at the http://www.ebay.com/itm/Universal-EEPROM-Flash-SPI-BIOS-24-25-BR90-93-USB-Programmer-6000-CHIPS-SP8-B-/371031966902?pt=LH_DefaultDomain_0hash=item56633a84b6 Do you think that would do the chips? On Wed, Aug 20, 2014 at 4:25 PM, Todd Micallef tmical...@gmail.com wrote: John, Don't forget to measure your 5V power supply output. I doubt you are having a problem with it but the NVRAM write is disabled below a certain voltage (~4.25v) Todd On Wed, Aug 20, 2014 at 6:50 PM, acb...@gmx.de wrote: the easy way to read nvram through usb is a usb-programmer that has your ram in its list of supported devices:-) this will not solve your problem though. if you reboot the unit after the first error messsage, amd the problem still exists, it is probably not with the nvram. then it could be things like bus drive, chip select logic... ne way to avoid spending 3k is to bus the cpu board, this is cheaper. Gesendet: Mittwoch, 20. August 2014 um 22:37 Uhr Von: John Phillips john.philli...@gmail.com An: Discussion of precise voltage measurement volt-nuts@febo.com Betreff: Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? Yes they are DEI220Y-150 and DSI230Y-150 On Aug 20, 2014 4:09 PM, J. L. Trantham jlt...@att.net wrote: John, Which chips are these? Dallas NVRAM's? Do you have a part number? They can probably be read and programmed with the appropriate chip programmer. Joe -Original Message- From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com ] On Behalf Of John Phillips Sent: Wednesday, August 20, 2014 3:54 PM To: Discussion of precise voltage measurement Subject: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips? Hi, I have removed my 32k memory chips form my 3458A. Doe anyone have an easy way to connect them to a windows computer. USB would be my preferred connection to a 28 and 24 pin socket. I would like to be able to read and write to the chips to validate the data. I have replace the chips and still get Mem test 1 High on start up. I really do not want to spend close to $3000 for KeySight to fix this. -- *John Phillips* ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. -- *John Phillips* -- *John Phillips* ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
[volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
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 -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
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 hol...@hotmail.com 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 -- volt-nuts@febo.com 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 -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
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: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] 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 hol...@hotmail.com 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 -- volt-nuts@febo.com 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 -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
[volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
The problem with removing the chip and copying it is the very real chance of glitching the contents in the process. Much better to make a backup copy first. The 32Kx8 NVRAMS are used for system memory and things like storage of user programs and data. Note that the two 32Kx8 devices are form a 16-bit word. The 2kx8 cal ram is only on the high byte of the data bus. MREAD returns memory contents as a signed integer value (-32768..32767) in ASCII. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
[volt-nuts] HP 3458A Mem test 1 hight. How do you read 32K memory chips?
Why risk having to re-cal the meter? There are several GPIB-232CV's on Ebay right now... Two of them are under $60 Buy-It-Now... cheap enough to be worth trying. The Prologix USB converter is around $100... $150 new from the factory. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
