I have a 3457A which does not get a lot of use, but it has not been calibrated for years, and I need to get it calibrated as I need to make some measurements of greater accuracy than usual. The 3457A is scheduled to go to Keysight a week from today. I'm wondering if its best to keep it powered up until then, to let the reference stabilize somewhat. Or it is a bit late for that now? I have asked Keysight to change the battery - I'm led to believe that Keysight will do that as part of the calibration unless the battery is particularly expensive. When I last looked, I could not find a suitable battery in the UK, and those in the US could not be shipped here. But that was a few years ago, so maybe things are different. 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 http://www.kirkbymicrowave.co.uk/ Tel 01621-680100 / +44 1621-680100

I would recommend leaving it on. You want to make sure it soaks as long as possible and then test it before shipping. Keysight soaks the 3458A before testing and it makes sense since you want to calibrate the meters as if they are in use 24/7. Inspect the supplies and make sure you have no leaking caps. It would be a shame to have a part fail once it reaches their lab. Good luck, Todd On Tue, May 15, 2018 at 8:47 AM, Dr. David Kirkby < drkirkby@kirkbymicrowave.co.uk> wrote: > I have a 3457A which does not get a lot of use, but it has not been > calibrated for years, and I need to get it calibrated as I need to make > some measurements of greater accuracy than usual. The 3457A is scheduled to > go to Keysight a week from today. I'm wondering if its best to keep it > powered up until then, to let the reference stabilize somewhat. Or it is a > bit late for that now? > > I have asked Keysight to change the battery - I'm led to believe that > Keysight will do that as part of the calibration unless the battery is > particularly expensive. > > When I last looked, I could not find a suitable battery in the UK, and > those in the US could not be shipped here. But that was a few years ago, so > maybe things are different. > > 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 > http://www.kirkbymicrowave.co.uk/ > Tel 01621-680100 / +44 1621-680100 > _______________________________________________ > 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. >