Hi Richard,
It has been our lab's interpretation to allow the equipment to stabilize to
ambient
room temperature unpowered - your item #3 below.. This usually takes 1 to 2
hours for larger
equipment constructed out of steel. Smaller items can take less time to
stabilize. As you have observed, the equipment may not function properly if
powered shortly after removal.
The intent of the standard is to see if any permanent damage has occurred from
the
exposure and rapid removal (i.e. moving from an uncontrolled storage
environment to
controlled active environment) and not to determine if the equipment will
operate shortly after removal from said storage environment. The equipment
should operate as intended when
powered up after stabilization.
Regards,
Kurt
Georgerian, Richard wrote:
Greetings All,
In the NEB Requirements: Physical Protection standard GR-63, sections 5.1.1.1
and 5.1.1.2, they both have the statement-
"Perform post-test equipment's functionality test after the equipment
has stabilized at ambient temperature."
This is after the unit has been soaked in -40 degrees C or +70 degrees C for
72 hours in an environmental chamber. The unit is then removed from the
chamber and into room ambient or the chamber ambient is increased to room
ambient temperature in less than 5 minutes. In determining the units
functionality, what is meant by the above statement? Is it to-
1) Turn the unit on immediately after removal from the chamber and observe
what happens.
2) Turn the unit on immediately after removal from the chamber, wait until the
unit has completed its power on sequence, then start to evaluate the unit's
functionality. The power on sequence may take several minutes as components
are warming up and may not start operating until they have reached a higher
operating temperature..
3) Wait until the unit's components has reached room ambient temperature,
before powering on the unit. This may take more than several minutes before
powering on the unit.
As for pass or fail, if the unit does not function normally even when the unit
has reached room ambient, it then fails. However, if it takes several minutes
and goes through several resets, before finally functioning normally, is that
a failure?
Thanks to all in advance.
Richard
=====
Richard Georgerian
Compliance Engineer
Carrier Access Corporation
5395 Pearl Parkway
Boulder, CO 80301
USA
Tele: 303-218-5748 Fax: 303-218-5503
mailto:[email protected]
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Environmental Simulation Lab Manager
Curtis-Straus LLC [email protected]
Laboratory for EMC,Safety Environmental Simulation Lab
NEBS,SEMI-S2 and Telecom 168 Ayer Rd.
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