[time-nuts] Z3805A cooling requirements?
Tom Van Baak
tvb at LeapSecond.com
Wed Dec 12 01:55:34 UTC 2012
The telecom closets and data centers I've visited have a significant amount of airflow. Could it be that there is an assumption that these telecom-rack GPSDO expect some level of air?
----- Original Message -----
From: <SAIDJACK at aol.com>
To: <time-nuts at febo.com>
Sent: Tuesday, December 11, 2012 5:20 PM
Subject: Re: [time-nuts] Z3805A cooling requirements?
> a fan is about the worst thing you can do for your Z3805 it will
> significantly worsen the stability of the output frequency. The oven inside does get
> warm, that's why it is an oven :)
> The power consumption will go down once it heats itself up, the unit is
> designed to work without a fan sitting on a desk etc. Just make sure the vent
> holes are not clogged.
> Sounds like your Z3816 had a failure that caused the units power supply to
> In a message dated 12/11/2012 16:22:10 Pacific Standard Time,
> stewart.cobb at gmail.com writes:
> This may be a newbie question, but I'm a newbie, so:
> Do the HP telecom GPSDOs (Z38xx) require external airflow for cooling?
> They don't have built-in fans, but they sorta look like they depend on a
> rack-level cooling fan, which a telecom rack would almost certainly have.
> I ask because I bought a Z3816 awhile back which worked for about a week
> and then failed. I traced the failure to an internal power supply brick,
> which had a big finned heat-sink attached but nevertheless smelled
> overheated and was shorted internally.
> I never found a replacement power brick, and I don't have time to mess with
> it right now, so I recently bought a Z3805A. It, too, looks like it's
> working, but it started to feel awfully warm after a few hours, so I
> unplugged it for now.
> It probably wouldn't take much of a fan to bring the internal temperature
> down close to ambient, and the fan could be powered easily enough from the
> supply rails. But that might create a temperature gradient where the
> designers didn't intend one. Or it might cause problems I don't even know
> about yet.
> At the moment, the Z3805A is in a fan-less 19-inch rack with a bunch of
> other equipment, in a lab environment. Should it have its own fan?
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