I have an HP 4339B high resistance meter. It can read up to 1.6 x 10^16 ohms, with a basic uncertainty of 0.6%. It has a built in voltage source of up to 1 kV.
I've contacted Keysight (UK) and asked for calibration cost, with uncertainties, for this 4339B. However, they have said they can't provide a calibration with uncertainties, and when I asked why, they have said they do not have an uncertainty budget available that suites that model. Looking at the Keysight website, a calibration with uncertainties is available in the USA, but I guess for whatever reason Keysight UK don't have this ability on this specific instrument. On other instruments I have sent them, I have never had this issue. I expect if I really wanted to, I could get it shipped to the USA and calibrated there, but I can't justify the costs that would be incurred if it was shipped to the USA and back. >From a practical perspective, I don't really need the uncertainties - it was more for interest sake. I also have a reasonable degree of confidence that as a reputable company, Keysight would not calibrate an instrument unless they were confident they could determine if it is in or out of specification. The 4339B is a pretty obscure unit, requiring resistors up to 10^11 ohms to calibrate it. I'm sending this to Keysight with a blank EEPROM, so there will be no calibration data whatsoever in the instrument. Hopefully that means everything will be set right, and so likely to stay in specification longer than it might otherwise do so. There are no trimmers in the 4339B - all calibration is via the EEPROM. A 3458A is used for calibration of the voltage source. I'm confidence the voltages will be measured accurately enough, but a bit less confident about the values of the resistors used for calibration. Dave 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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
