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Multi-Position Test Fixture

IP.com Disclosure Number: IPCOM000185471D
Original Publication Date: 2009-Aug-14
Included in the Prior Art Database: 2009-Aug-14
Document File: 3 page(s) / 374K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

CPU (Central Processing Unit) microprocessors and expansion modules have to be tested after the manufacturing. At present the testing procedure comprises the following steps (refer to Figure 1): 1. The product module is fixed in a test fixture und is slided up to the testing position. 2. In the testing position, the test probe connects to the module and performs the test. When the test is finished, the module is slided down. 3. The tested product is removed from the fixture and the module 2 is fixed in the fixture. 4. Module 2 is slided up and tested. Until now the test systems have only one test position. Hence, the whole test course of one product has to be finished until the next product can be positioned in the test fixture. Therefore, a multi-position test system with, e.g., two or three test positions is proposed (refer to Figure 2). In a test system with three test positions, two different tests can be done. The test system according to the proposal includes four parts (refer to Figure 3 a) and 3 b)):

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Multi-Position Test Fixture

Idea: Qi Xu; CN-Nanjing; Chao Zhi Sun, CN-Nanjing; Huan Hai Guo, CN-Nanjing

CPU (Central Processing Unit) microprocessors and expansion modules have to be tested after the

manufacturing. At present the testing procedure comprises the following steps (refer to Figure 1):
1. The product module is fixed in a test fixture und is slided up to the testing position.
2. In the testing position, the test probe connects to the module and performs the test. When the

test is finished, the module is slided down.
3. The tested product is removed from the fixture and the module 2 is fixed in the fixture.
4. Module 2 is slided up and tested.

Until now the test systems have only one test position. Hence, the whole test course of one product

has to be finished until the next product can be positioned in the test fixture.

Therefore, a multi-position test system with, e.g., two or three test positions is proposed (refer to

Figure 2). In a test system with three test positions, two different tests can be done. The test system

according to the proposal includes four parts (refer to Figure 3 a) and 3 b)):
1. turn plate, which rotates around its center (part 1 in the Figure 3)
2. fixture, which is attached on the turn plate and holds the product module (part 2 in the Figure

3). The number of the fixtures corresponds to the number of the test positions.
3. interface system for signal connection (part 3,4,5 in the Figure 3). Since the signal connection

has to be separated when the plate is turning around, several interfaces are necessary.
4. system which fixes the turn plate at a given point (part 6 in the Figure 3). For example, the turn

plate is locked after a rotation of 180° in a two position system and after 120° in a three

position system.

When the module has been fixed in the fixture, the terminal of the module is connected with the

interface on the fixture through a cable in the fixture. The test device, which tests the module, is

connected with the interface on the cylinder. When the fixture is turned to the correct position, a

sensor sends the signal to the PLC (Programmable Logic Controller), which initiates that the cylinder

interface is connected to the fixture interface. As a result, the test device is connected to the module,

so the test can be started. While the test is performed, the operator places another product module on

the second fixture. When the test is finished, the PLC initiates the disconnection of the cylinder

interface from the fixture interface. In the case of a test system with two test positions, the fixture

rotates around 180°. Now the second product mo...