I've done something rather stupid with my 3457A. I took it apart to replace the battery, and then seem to have mislaid the screws that hold the thing together. As far as I can see, there are 4 screws in the base. The problem is, I don't know what type they are. Could anyone with a 3457A tell me the type - a photo with dimensions on emailed to me would be great. I'm guessing these will be an American thread of some sort. I can get these in the UK, although not quite as readily as metric. But of course its difficult if you don't know what you want. FWIW, I decided not to change the battery. Having visited Keysight in February, their cal lab manager said if I asked for it, they would check the calibration of the instrument before replacing the battery, then replace the battery at zero cost*, then calibrate it. So I would get before and after data anyway. * This assumes the battery is not very expensive. If the battery was expensive, I'd have to pay for the battery. My 3457A has not seen a cal lab in a couple of decades, so I think it deserves a check over. Dave

HP has been metric for years. Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > I've done something rather stupid with my 3457A. I took it apart to replace > the battery, and then seem to have mislaid the screws that hold the thing > together. As far as I can see, there are 4 screws in the base. The problem > is, I don't know what type they are. Could anyone with a 3457A tell me the > type - a photo with dimensions on emailed to me would be great. I'm > guessing these will be an American thread of some sort. I can get these in > the UK, although not quite as readily as metric. But of course its > difficult if you don't know what you want. > > FWIW, I decided not to change the battery. Having visited Keysight in > February, their cal lab manager said if I asked for it, they would check > the calibration of the instrument before replacing the battery, then > replace the battery at zero cost*, then calibrate it. So I would get before > and after data anyway. > > * This assumes the battery is not very expensive. If the battery was > expensive, I'd have to pay for the battery. > > My 3457A has not seen a cal lab in a couple of decades, so I think it > deserves a check over. > > Dave > _______________________________________________ > 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, I measured the threads to be metric at .7mm pitch. I believe it to be an M4 x .7 x 49mm though most likely a 50mm will work or even a 48mm (length). > On Jun 10, 2017, at 3:02 PM, Chuck Harris <cfharris@erols.com> wrote: > > HP has been metric for years. > > Dr. David Kirkby (Kirkby Microwave Ltd) wrote: >> I've done something rather stupid with my 3457A. I took it apart to replace >> the battery, and then seem to have mislaid the screws that hold the thing >> together. As far as I can see, there are 4 screws in the base. The problem >> is, I don't know what type they are. Could anyone with a 3457A tell me the >> type - a photo with dimensions on emailed to me would be great. I'm >> guessing these will be an American thread of some sort. I can get these in >> the UK, although not quite as readily as metric. But of course its >> difficult if you don't know what you want. >> >> FWIW, I decided not to change the battery. Having visited Keysight in >> February, their cal lab manager said if I asked for it, they would check >> the calibration of the instrument before replacing the battery, then >> replace the battery at zero cost*, then calibrate it. So I would get before >> and after data anyway. >> >> * This assumes the battery is not very expensive. If the battery was >> expensive, I'd have to pay for the battery. >> >> My 3457A has not seen a cal lab in a couple of decades, so I think it >> deserves a check over. >> >> Dave >> _______________________________________________ >> 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.

If you are sending it in you could just tape the cases halves together and let them replace the screws. You may want to check with them about it but I would be more surprised than not if they charged you for it. On Sat, Jun 10, 2017 at 4:46 PM, Jerry Hancock <jerry@hanler.com> wrote: > John, I measured the threads to be metric at .7mm pitch. I believe it to > be an M4 x .7 x 49mm though most likely a 50mm will work or even a 48mm > (length). > > > > On Jun 10, 2017, at 3:02 PM, Chuck Harris <cfharris@erols.com> wrote: > > > > HP has been metric for years. > > > > Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > >> I've done something rather stupid with my 3457A. I took it apart to > replace > >> the battery, and then seem to have mislaid the screws that hold the > thing > >> together. As far as I can see, there are 4 screws in the base. The > problem > >> is, I don't know what type they are. Could anyone with a 3457A tell me > the > >> type - a photo with dimensions on emailed to me would be great. I'm > >> guessing these will be an American thread of some sort. I can get these > in > >> the UK, although not quite as readily as metric. But of course its > >> difficult if you don't know what you want. > >> > >> FWIW, I decided not to change the battery. Having visited Keysight in > >> February, their cal lab manager said if I asked for it, they would check > >> the calibration of the instrument before replacing the battery, then > >> replace the battery at zero cost*, then calibrate it. So I would get > before > >> and after data anyway. > >> > >> * This assumes the battery is not very expensive. If the battery was > >> expensive, I'd have to pay for the battery. > >> > >> My 3457A has not seen a cal lab in a couple of decades, so I think it > >> deserves a check over. > >> > >> Dave > >> _______________________________________________ > >> 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*

On 11 June 2017 at 08:19, John Phillips <john.phillips0@gmail.com> wrote: > If you are sending it in you could just tape the cases halves together and > let them replace the screws. You may want to check with them about it but I > would be more surprised than not if they charged you for it. > I don't want to push my luck. From what I understand, if something goes into Keysight for "repair", the repair is performed before any measurements are taken of the instrument. When my 4284A LCR meter was sent to Keysight, I did not get any information about the state it was sent, as a software upgrade (support for 2 m and 4 m cables) was added before the instrument was calibrated. The upgrade was free. So they would seem to be doing me a favor by checking the meter, then changing the battery, then checking calibrating it. This is not normal practice, so I'm not keen to send the 3457A in bits, if I can put it back together. M4 screws are very easy to obtain in the UK, I will see if I have some 45 / 50 mm ones, but if not, will order some. Dave