Look at the service manual, the calibration setup listed is usually pretty close to what Keysight is using in their local calibration facility. For an LCR meter I doubt they would be using a time nuts grade counter
Content by Scott Typos by Siri > On Aug 29, 2015, at 10:02 PM, Bob Camp <[email protected]> wrote: > > Hi > > Well, since we all have made our totally uninformed guesses, the only > thing to do now is to give Keysight a call and see what the real answer > is. > > Bob > > >> On Aug 29, 2015, at 1:46 PM, Dr. David Kirkby (Kirkby Microwave Ltd) >> <[email protected]> wrote: >> >> On 29 August 2015 at 12:59, Javier Herrero <[email protected]> wrote: >> >>> Hello, >>> >>> The calibration certificate does not indicate that the measurements were >>> done with the frequency counters referenced to the 5071A at the time of >>> calbiration (if so, it would be listed under the Calibration Equipment Used >>> table). It says that the 53132A were calibrated against the 5071A. >>> >>> If for your calibration they have used 53132A witout the oven oscillator >>> option it is very probable that its uncertainity is 7.6ppm as indicated in >>> the certificate. Since the maximum error tolerable for the LCR meter is >>> 100ppm (+/-100Hz @ 1MHz), it makes sense to perform the measurement with an >>> instrument with an uncertainity of 7.6ppm, and not to use the better >>> counter in the lab for that purpose. >>> >>> Regards, >>> >>> Javier >> >> >> I would find it a bit hard to believe they would use a counter without an >> oven in their lab, as it would seriously restrict what they can do with it, >> making it more difficult to replace one counter with another. I would have >> thought that within reason it best to have the lab have reasonably high >> spec kit, so more than one instrument could be done on the same line. They >> did for example use a pair of 3458As, despite I'm sure the voltage accuracy >> requirements could be met with a multimeter with far greater uncertainty >> than an expensive 3458A. It makes more sense (within reason) to have 3458As >> in the cal lab, as it allows a wider range of instruments to be calibrated. >> >> Also, if you consider the spec on the 53132A without an oven, it is 3 x >> 10^-7 per month. So after 12 months that could be 12 * 3 10^-7 or 3.6 >> 10^-6, so if it did drift the maximum amount each month for a year, the >> uncertainty would higher than it actually is. >> >> I intended to contact Keysight about the calibration for a couple of other >> reasons >> >> 1) I would like to know if it was adjusted or not. That is not clear from >> the cal certificate, since the >> >> * As received condition - Not applicable, as this calibration certificate >> applies to the initial calibration of a new, refurbished or upgraded >> equipment. >> * Action taken - The equipment was upgraded. >> >> I doubt it has seen a cal lab in ages. >> >> The upgrade was just a software one, to enable cable lengths of 2 m and 4 m >> (option 006) to be used to connect the DUT, which they kindly provided free >> of charge, on the condition I paid for the calibration. >> >> 2) They never put any stickers over the screws that prevent the covers >> being removed, which struck me as a bit odd. >> >> Since I was going to ask about those two issues, I will ask about the >> uncertainty on frequency too. It will be interesting what response I get. >> I'm just interested - I realize that this instrument does not demand much >> of the counter used to calibrate it. The demanding calibration devices >> would be the resistance and capacitance standards. >> >> Dave >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
