Preparation for
Use
TP04100A
Interface
&
Applications
2-15.3
Moisture Protection
Rev
A:
0611
5/98
TEMPTRONIC
L'C.EPORATIOl4
2-1 5.3.1 Overview
With reference to the typical test site, there are two principal areas to protect from moisture:
1.
The DUT and the test socket in which the DUT is seated (the area below the thermal cap onto
which Thennostream air is directed).
2. The tester platform (test board) and its test cables, socket lead wires and related interconnections
(normally exposed to room air temperatures).
See below for how to insulate the DUTIsocket, and how to use purge air for the tester platform area.
2-15.3.2 Seal Out Moisture Inflows:
DUT
&
Socket
Although the pneumatic design of the system and conditioning of ThermoStrearn airflows work to deliver
dry air to the DUT within or below the thermal cap, it is necessary to provide a tight seal between the lower
edge of the thermal cap and the upper surface of the tester platform when the thermal wand moves up and
down to allow inserting and extracting the DUT (see Figure 2-10 "Typical Test Site").
To make a tight seal, install the provided silicone foam insulating material onto the tester platform surface, as
described in Section 2-15.4, "Temperature Extreme Protection," and as shown in "Figure
2-1
1 Typical
Insulation for DUT."
2-1 5.3.3 Air Purging the Tester Platform
Condensation, frosting and ice can appear on the tester platform (test board) and its test cables, socket lead
wires, and related interconnections, during low temperature testing unless the platform area is properly
purged with system-supplied dry air as given below.
For instance, if the tester platform is exposed to ambient room air which has a dew point on the order of
15
"C, and if the ThermoStream outlet air is at a low temperature, then thermal conduction and forced
convection may cause condensation, frosting and/or icing to appear on the tester cables.
The best way to prevent these conditions is to provide an air gap around the tester platform lead wires and
cables and to purge the area with dry air.
The TP04100A supplies purge air from an air purge outlet located on the back panel of the controller. The
purge air may be directed to where condensation is to be prevented. To attach purge air hoses, see "Attach
Thermal Cap, Thermal Shroud, Purge Air," Section 2-10 on page 2-1
1.
At low temperatures, ThermoStream airflow has a very low dew point. Since it is very dry, condensation
within the thermal cap is not a concern.
Also, Temptronic can provide either standard or custom thermal test enclosures for your test site (see Section
2- 16, "Turnkey Test Enclosures").
Page
2-24
41
1A-S2F.doc
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