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Agilent Technologies 1989–2002
Agilent 3070 / 79000 Site Preparation
7-4
Chapter 7: Site Preparation – Compressed Air and Vacuum Requirements: Vacuum Requirements
Vacuum
Requirements
This section contains:
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Connecting Vacuum to the Testhead
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Vacuum System
The Agilent 3070 / 79000 family system uses vacuum
(with vacuum-actuated test fixtures) to pull the board
under test down onto test probes. Because of the
different sizes of test systems, test fixtures, and the
variety of boards that can be tested, vacuum
requirements can vary significantly.
Agilent recommends that you work with a qualified
vendor of vacuum pumps that can give you advice based
on your requirements.
Vacuum Recommendations
shows the vacuum recommendations for a
typical 3070 / 79000 family system.
Table 7-2
Vacuum recommendations for 3070 / 79000 systems
Description
Measurement
Recommended Flow
Rate of Pump
18.9 l/s at STP (40 SCFM)
1
Use this value as a guideline. Vacuum specification is dependent on
the fixture, not the Agilent 3070 / 79000 testhead. Agilent has found this specification will pull
down most fixtures.
Pressure Performance
50 kPa (7.2 psi)
1
Vacuum Control Ports
available for controlling
external vacuum valves
4 vacuum control ports: switched 24 volts dc, 750 milliamps maximum per port
1. l/s is liters per second. STP is standard temperature and pressure. SCFM is standard cubic feet per minute. psi is pounds per
square inch. See the