I find no 'search' function on here... How do you get to the GPIBKIT ? Willy
On 2/20/2015 12:00 PM, volt-nuts-requ...@febo.com wrote:
Send volt-nuts mailing list submissions to volt-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts or, via email, send a message with subject or body 'help' to volt-nuts-requ...@febo.com You can reach the person managing the list at volt-nuts-ow...@febo.com When replying, please edit your Subject line so it is more specific than "Re: Contents of volt-nuts digest..." Today's Topics: 1. Fluke 725 and 726 (pa4...@gmail.com) 2. Re: 3458a BASIC commands for today??? (cfo) 3. What do the NIST numbers on a calibration sheet come from and what do they mean? (John Phillips) ---------------------------------------------------------------------- Message: 1 Date: Thu, 19 Feb 2015 17:16:56 +0000 From: <pa4...@gmail.com> To: volt-nuts <volt-nuts@febo.com> Subject: [volt-nuts] Fluke 725 and 726 Message-ID: <54e624f2.edcdb40a.2362.1...@mx.google.com> Content-Type: text/plain; charset="utf-8" Can someone help me with 2 Fluke service manuals or schematics fot the 725 and 726 proces calibrators ? I have here for repair a Fluke 725 that has a fried ADC. It has been to a Fluke dealer for repair and you do not want to know how bad that job is done. (missing pads and traces , cold solderjoints, , a relais facing the wrong way, the -5V from the 4053 tied to gnd, a damaged resistor etc. ) I'm 100% sure the ADC is dead and 95% that is the only problem left but have not ordered a replacement yet because I hope for a manual so I can check the rest for hidden supprises caused by the dealer. The 726 from the same customer that came in this week only has a TC problem. I traced the TC output to an opamp and analog switch. In TC mV mode he measures it correct but in K mode ( I only haver K TC's ) or any other TC's except for N, he shows the letter of the TC so that part works. But no value in derees. As far as I can gues the ADC measures the voltage, and the software does the conversion. But in that case it is weird it measures and displays the voltage correct. So I think there must be some switching before the ADC but I can not find it. I get stuck at the opamp. and ADC because they are hidden behind the display making it hard to measure. I use a lab powersupply and an extender cable to the keypad but the display uses those bloody zebrastrips. A lot of the repairs I do are older, rather exotic gear with missing schematics/service doc so I'm used to finding my own wayvbut I'm not that masochistic, so I prefer to use documentation. Fred Schneider electronics repair bv www.schneiderelectronicsrepair.nl www.pa4tim.nl ------------------------------ Message: 2 Date: Thu, 19 Feb 2015 19:35:38 +0000 (UTC) From: cfo <xne...@luna.dyndns.dk> To: volt-nuts@febo.com Subject: Re: [volt-nuts] 3458a BASIC commands for today??? Message-ID: <mc5dua$7ck$1...@ger.gmane.org> Content-Type: text/plain; charset=UTF-8 On Thu, 19 Feb 2015 04:23:07 +0000, Mark Sims wrote:IF you have a GPIB interface, download the GPIBKIT package from John Miles' web site. It now contains my HP3458 cal ram dumper program. It will extract the cal info from the NVRAM, make a backup binary image of the cal ram chip , and dump a formatted and commented listing of the cal data. The binary data file can be used to program a replacement NVRAM chip when the battery in the old chip dies and you need to replace it... saving you a buncha bucks for a re-calibration of the instrument.I did a "linux-gpib" "addon lib" that fakes a few parts of GPIBKIT , so you can use Mark's/PHK's program , and i mailed the source to Mark. /CFO ------------------------------ Message: 3 Date: Thu, 19 Feb 2015 12:06:22 -0800 From: John Phillips <john.philli...@gmail.com> To: Discussion of precise voltage measurement <volt-nuts@febo.com> Subject: [volt-nuts] What do the NIST numbers on a calibration sheet come from and what do they mean? Message-ID: <CANEyv6br9ARRJ2XnHy9sqyqM6Z4WSQRNUzcMHfs=J0=2mve...@mail.gmail.com> Content-Type: text/plain; charset=UTF-8
_______________________________________________ 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.
