7-2 Site Preparation
7 Compressed Air and Vacuum Requirements
Introduction
Both compressed (or pressurized) air and vacuum are used in the testhead.
Compressed air is used primarily to secure the test fixture to the testhead. Vacuum
is used primarily to actuate the test fixture: that is, to make contact between the
board under test and the probes in the fixture. Compressed air is sometimes also
used for air-assisted, solenoid-actuated valves used to switch the vacuum, and for
air-actuated test fixtures.
The site preparation requirements for compressed air and vacuum are different
depending on the type of testhead you are preparing the site for. This chapter
describes those requirements.
For more about compressed air and vacuum principles and terminology, see the
short Compressed Air and Vacuum Primer on page 7-6.
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