John: One big difference is that when most of the butane leaked out and air leaked in, you'd get a very clear indication when arcs occur. I wouldn't want to be holding it.
I think Tek degrades the P6015 to 13kV without Freon - enough for my needs. Maybe someone will find out that Home Depot Bathtub Selant #17 has a breakdown of 60kV and we can all do one last refill... Jose -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of NeonJohn Sent: Thursday, September 22, 2011 10:35 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Tek high voltage probes On 09/21/2011 04:57 AM, David C. Partridge wrote: > Howsabout HFC-236fa - very similar properties to R114 but not banned. >> Tektronix used a Freon in their 40 KV High Voltage probes. The Vapor >> pressure of some of those compounds is low at 70F, but they do have to >> be sealed. I use several of the Tek probes in my work (and of course am too cheap to buy the newer solid dielectric ones). When my freon ran out, I searched around for a replacement fluid and found ordinary butane straight from the Ronsonol can to be equal to or maybe even better than the original freon. About a decade ago I wrote up a procedure on how to do the fill without introducing condensate into the chamber. I posted it to Usenet. I think that it's archived at http://yarchive.net. John -- John DeArmond Tellico Plains, Occupied TN http://www.neon-john.com <-- email from here http://www.johndearmond.com <-- Best damned Blog on the net PGP key: wwwkeys.pgp.net: BCB68D77 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.