Scott, et al,
From your comment & Brian's analysis, which makes sense, you should
now add a test corner (as best you can fit one in) inside the temperature
chamber to copy the conditions that are normally used outside the chamber.
Then the results obtained are the proper, comparable results since you have
duplicated the usual test conditions in your temperature controlled
environment.
:>) br, Pete
Peter E Perkins, PE
Principal Product Safety Engineer
PO Box 23427
Tigard, ORe 97281-3427
503/452-1201 fone/fax
p.perk...@ieee.org
_ _ _ _ _
Brian,
I also suspect the forced air circulation may help the heat dissipation.
This variation will affect the result. When we conduct temperature rise at
room temperature, we will place the sample inside the test corner and block
the airflow directly from the top to the sample. It seems when we use
temperature chamber for other ambient temperature, the repeatability is
quite challenge.
Regards,
Scott
> On 2 Mar, 2016, at 10:10 pm, Kunde, Brian <brian_ku...@lecotc.com> wrote:
>
> How windy is it inside your chamber? Ours has large fans to circulate the
air. Air moving across the surface of your EUT will pull the heat out lowing
the external measurements. I really don't know how to get around this other
than to turn off the fans to let the air go stagnant around the EUT. This
would be worst case.
>
> For fun, when you are doing thermals outside a chamber, once your external
temps stabilize, turn on a fan and blow it at your EUT. The moving air will
cause the external temps to drop. The EUT heats up the air around itself
cause a higher reading on external temps. If you blow away this warm air the
external reading will lower.
>
> The Other Brian
>
> -----Original Message-----
> From: Scott Xe [mailto:scott...@gmail.com]
> Sent: Wednesday, March 02, 2016 8:37 AM
> To: EMC-PSTC@LISTSERV.IEEE.ORG
> Subject: [PSES] Ambient temperature
>
> We would like to verify the temperature rise at 40 degC ambient
temperature. The sample under test was placed in a temperature chamber set
at 40 degC. The internal temperatures were close but the external
temperatures were marked different and even lower than the room temperature
without using temperature chamber. Is there any standard method to create
ambient temperature to have a repeatable testing conditions?
>
> Thanks and regards,
>
> Scott
>
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