Operation
32
Bench Top User’s Manual
6.1 Test Preparation
6.1.1 How to Arrange Specimens
Space specimens apart and away from walls so as not to block air circulation inside the test area.
Temperature (& humidity) uniformity drops if air cannot flow freely, which will throw off test results.
FIGURE 6.1.HOW TO ARRANGE SPECIMENS
Specimens should be placed only within the “working” space of the chamber. The “working” space is
defined as the inner 80% of the chamber interior volume with a minimum distance from the walls being 2”
(50mm). For example:
1. If the chamber width is 20” then the specimen should not be placed closer than 2” to the
chamber side wall.
2. If that same chamber has a depth of 11” then the specimen should not be placed any closer
than 2” to the door or rear wall. (10% is 1.1”, however the minimum is 2”.)
3. If the chamber height is 32” then the specimen should not be placed closer than 3.2” from
the ceiling or the floor.
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