[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.
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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