Hi David, Many thanks for your notes re the ICs and and for the version 12 firmware, I'm still undecided as to whether or not I'll perform the firmware update anyway but it's certainly good to have the choice. With regards to the 400K resistor replacement, the HP service note on replacing this doesn't include any instructions for cleaning and the only "burn-in" requirement is to leave the unit running for four hours before calibration, so presumably that's all you'd get if the replacement was carried out by Keysight themselves.Obviously it doesn't hurt to improve on the minimum but I would expect that careful cleaning of the component and rework area with 99% isopropyl alcohol should be adequate followed by burn-in as suggested, then keep an ongoing eye on the calibration. Nigel, GM8PZR -----Original Message----- From: Dr. David Kirkby <[email protected]> To: Discussion of precise voltage measurement <[email protected]> CC: gandalfg8 <[email protected]> Sent: Sat, 29 Jun 2019 20:55 Subject: Re: [volt-nuts] How should I clean a 400 k ohm resistor?
n Wed, 26 Jun 2019 at 19:38, Nigel Clarke via volt-nuts < [email protected]> wrote: > Oh boy, that's quite a collection of service notes, and quite some can of > worms:-) > Thanks for the link, I've not seen any of those before and wonder why they > don't include them on the 34970A documentation page? > Nigel, GM8PZR > I did manage to find the service notes myself from the Keysight website, so I guess they are linked somewhere, but I must admit they are not easy to find. I put version 12 of the firmware here - the latest is version 13. https://www.kirkbymicrowave.co.uk/Support/34970A/ so if you want to update the firmware to version 12, you can do. I put some notes about possible PROMS. To be honest, given the latest (version 13) PROM is only $41.29 from Keysight, you might consider it less hassle and better to just buy the chip and fit it. Then you have the latest version, and no need to mess about. If you send the instrument to Keysight UK for calibration, you can get the firmware updated free. although they kick up a bit of argument about it, but I got my 4285A LCR meter updated, and they have agreed to do likewise for the 34970A. The 34970A does look a very useful instrument for any volt nut, time nut, or anyone else that wants to collect electrical data and process it. Dr David Kirkby Ph.D C.Eng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, CHELMSFORD, Essex, CM3 6DT, United Kingdom. Registered in England and Wales as company number 08914892 https://www.kirkbymicrowave.co.uk/ Tel 01621-680100 / +44 1621-680100 _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there. _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/volt-nuts_lists.febo.com and follow the instructions there.
