[time-nuts] HP5370 power supply measurements

Van Horn, David david.vanhorn at backcountryaccess.com
Wed Jul 13 13:03:53 EDT 2016

Have you tried a 110V shaded pole motor fan?  Only 60Hz magnetic noise, no brushless commutation or brushes.

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Mark Sims
Sent: Wednesday, July 13, 2016 9:50 AM
To: time-nuts at febo.com
Subject: [time-nuts] HP5370 power supply measurements

I have replaced the fans in all my 5370's with quiet 12V  (150-250 mA) brushless DC fans running off of the 10V rail.   I placed themocouples around the inside of the unit and compared before and after temperatures and found no significant differences.  I have used several different models of fans... whatever the local surplus store had at the time.

I also replaced the fans in my HP16500 logic analyzers  (aka pizza ovens)  with much quieter fans.


> Speaking of fan noise -- you can't really get away with replacing the
internal fan with one that moves less air, so it is hard to find a replacement that generates significantly less noise.  If you find one, 
please share the make and model -- all 5370 owners would love to know. 		 	   		  
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