开云体育

I'm with the school of thought regarding not stressing U800 mechanically, so I
used this particular heat sink.  One thing nice about the 2465A/2467 generation
is that they still have Tektronix-produced U800.

To provide some data regarding this particular heat sink, I turned on my 2465A
and left it running for one hour, with the cabinet on.

Then I removed the cabinet, turned the power back on, and measured temperature
of some of the hybrids using my Fluke instant read IR thermometer.

Here are my measurements, at 72 degrees F ambient temp:

U100, U200 CH1 and CH2 preamps:  92 degrees F
U400 Channel Switch:  84 degrees
U500 A/B Trigger:  81 degrees
U600 Vertical Output:  91 degrees
U700 A Sweep:  84 degrees
U800 Horizontal Output:  115 degrees upon restoring power, rising to 122 degrees
on the heat sink and the threaded stud nearest the edge of the unit.  When the
heat sink was 122 degrees, the threaded stud near the center of the unit (which
contacts the IC's metal tab) measured 106 degrees.  I turned off the scope power
after U800 got up to 122 degrees F.

It is unfortunate that there is no easy way to assess the temp of U800 when the
scope is installed in its cabinet.

I'd be interested to see temp measurements from other group members who have a
different heat sink or no heat sink on U800.

Patrick Wong AK6C

--- In TekScopes@..., "Patrick Wong" <patwong3@...> wrote:
>
> Hi Steve,
>
> Here is one possible solution:
> <>
>
> Basically a low-profile heat sink is needed that will not contact the cabinet
bottom.
>
> Patrick Wong AK6C
>
> --- In TekScopes@..., Steve  wrote:
> >
> > I've seen reference to additional cooling for U800 in several postings.
> > Is there somewhere on the internet that suggests how to go about doing that?
>




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