[time-nuts] HP 5370B low frequency modulation

Mike Feher mfeher at eozinc.com
Sun Jul 22 22:20:41 EDT 2007

I believe it is almost impossible to have an intermittent thermal fuse due
to their very clever design. Although over age they can open up. Once open,
however I do not believe they can connect again. The fuse is simply to
metallic contacts that are force to be in contact during assembly. Their
normal desired resting state would be to be not connected. When closed, the
fuse cavity is filled with wax, which mostly determines when the fuse opens
(temperature). With too much current through the fuse, the wax heats
allowing the contact to spring apart to their normal resting position. Now,
with no more current flowing, the wax hardens almost immediately, never
allowing the two contacts to meet again. - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Dr Bruce Griffiths
Sent: Sunday, July 22, 2007 9:39 PM
To: Magnus Danielson; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5370B low frequency modulation

); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+mfeher=eozinc.com+mfeher=eozinc.com at febo.com

Hej Magnus

Could there perhaps be an intermittent thermal fuse in the 10811?


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