TEMPTRONIC
C3FFORAT;ON
Rev
A:
0611 5/98
Preparation for Use
TP04100A
Interface
&
Applications
2-15
Static, Moisture, Temperature Extreme Protection
2-15.1 Overview
Temperature transition times are dependent on mass, specific heat characteristics, and the thermal coupling
and thermal conduction paths to the Device Under Test (DUT), test socket, test leads, and other fixturing
features.
This section offers information to optimize test site setup by addressing three related topics:
1.
Protecting the test site from the buildup and discharge of static electricity (see Section 2-1 5.2)
2. Preventing moisture infiltration at the DUTIsocket and condensation buildup on the tester platform
and cables, the latter to prevent icing (see Section 2-1 5.3)
3. Minimizing undesired heat transfer at the DUT site to increase test efficiency and protect tester
board components from damage due to temperature extreme damages (see Section 2-15.4)
For the option of using one of Temptronic's standard configuration, or application-specific custom thermal
test enclosures, see Section 2-1
6,
"Turnkey Test Enclosures."
2-15.2 Electrostatic Discharge (ESD) Protection
Component damaging static electricity can be generated in the normal course of handling sensitive
electronic products, principally when two non-conductive surfaces are either rubbed together or separated.
Such an electrostatic discharge (ESD) can also be generated by the discharge of compressed air or other inert
gases over a surface, regardless of the air jet velocity but increasingly at higher, sustained air jet velocities.
The airflows through Temptronic ThermoStream pneumatic systems have been extensively researched and
designed to provide ionically neutral air (free of static charge) at the thermal wand air nozzle output onto the
DUT test fixture, so long as the guidelines presented in this manual are implemented.
Temptronic has measured the electric field in the vicinity of the temperature controlled gas discharged from
the ThermoStream nozzle, and concluded, the measurements [measured with field meters and probes] of the
electric field in the vicinity of the jet does not indicate the presence of a significant or measurable number of
charged particles in the jet.
The air flow paths through the TP04100A are fully grounded: from the air inlet to its air nozzle output. Also,
when the optional conductive shroud kit (for interfacing to the DUT) is used,
an
"ESD Protected Test
Environment" is assured. It is not normally necessary to add air ionizer equipment to the fixture site to
provide ionically neutral air.
Note, however, that relative humidity has a significant impact on the generation of static electricity, and that
the next topic, "Moisture Protection," is a factor directly related to ESD control.
Page
2-23
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