ICT Disadvantages

Every coin has two sides, though in-circuit test is a very powerful tool for testing PCBs, the in-circuit test also has some disadvantages which are listed as following. 

1. As the fixtures are mechanical and require general and wiring assembly for each printed circuit board, they can be a costly item.

2. As the fixture is a fixed mechanical item, with the probes or "nails" mechanically fixed, any updates to the board changing the position of the contact points can be costly to change.

3. Electrolytic components can be tested for polarity only in specific configurations (e.g. if not parallel connected to power rails) or with a specific sensor

4. The quality of electrical contacts cannot be tested unless extra test points or a dedicated extra cable harness are provided.

5. It is only as good as the design of the PCB. If no test access has been provided by the PCB designer then some tests will not be possible. 

Foe more info., pls visit Shanghai EPCB.

ICT Advantages

In-circuit test is a very powerful tool for testing custom PCBs which has several advantages. When determining the best form of test for any given application, it is necessary to investigate the advantages of each system carefully.

Easily detect manufacturing defects: It is that most board faults arise from problems in manufacture - incorrect component inserted, a wrong value component, diodes, transistors or ICs inserted with incorrect orientation, short circuits and open circuits. These are very easily and quickly located using ICT as the in circuit tester checks components, continuity, etc.

Programme generation is easy: An In-Circuit tester is very easy to programme - files can be taken from the PCB layout to generate much of the programme required.

Test results easy to interpret: As the system will flag a particular node as having a short of open, or a particular component as being faulty, location of a problem in a board is normally very easy - and do not require the application of the most highly skilled test staff.

For more info., pls visit Shanghai EPCB.