9018-18076.pdf.pdf - 第67页
Keysight i3070 Series 5 In-Circuit Test System Site Preparation 8 Receiving and Moving Instructions Inventory the Shipment 8-2 Uncrating the System and Support Bay 8-3 Placing the System 8-4 Re-shipping a System 8-5
7-8 Site Preparation
7 Compressed Air and Vacuum Requirements
Vacuum
The system doesn’t use vacuum directly. Rather, the vacuum is used by the fixture to pull a device
under test (DUT) onto the probes. The system provides valves, plumbing and control to assist in
supplying vacuum to the customer’s fixture.
The pressure requirements for vacuum come from the need to compress the probes, fixture springs
and seals. Since most commercial vacuum systems operate around 50 kPa (7.5 psi), vacuum fixtures
are limited in their ability to handle DUTs with high probe densities. If the sum of the probe, spring and
seal forces divided by the area of the DUT is above 48 kPa (7 psi) the fixture will not be able to properly
pull the DUT onto the probes.
The flow requirements for vacuum come from fixture leaks, number of fixture cycles per minute, the
size of the DUT and the need to quickly evacuate the fixture to make a good seal around the DUT. Due
to the variability of these factors, it is difficult to provide an exact flow rate recommendation. Keysight
has found that a flow rate of 19 l/s (40 SCFM) will pull down most fixtures.
8-2 Site Preparation
8 Receiving and Moving Instructions
Inventory the Shipment
Use the packing list that came with your system to determine if the system was fully received.
Carefully examine the boxes for shipping damage. If you suspect the system was damaged in
shipment, contact your Keysight representative.