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HP5370 power supply measurements

Mark Sims

Wed, Jul 13, 2016 3:49 PM

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.

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.

Van Horn, David

Wed, Jul 13, 2016 5:03 PM

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

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.

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.

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@febo.com] On Behalf Of Mark Sims Sent: Wednesday, July 13, 2016 9:50 AM To: time-nuts@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. _______________________________________________ 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.