Flying probe tester is a form of automated test equipment
that has been in use around 1986 when the first testers were introduced. Flying
probe testers provide many advantages over other forms of automated test equipment
for particular application and purpose. In the initial days flying probe
testers were introduced to cover the prototype and very small quantity
production areas. Now the use of this type of automated test equipment has
expanded, and although not used as the main test in high volume production,
they are nevertheless used in many areas.
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| Flying Probe |
The concept of flying probe test system is that rather
than having a comprehensive fixture for a given PCB assembly that can access
all the required nodes via a “bed of nails”, the system uses a generic board
holder, and one or more probed moves across the board accessing individual
nodes under software control. The flying probe tester is therefore able to cut
down on the number of test fixtures that are required and it’s easier to
introduce changes, especially to features such as component or pad positions
because it is just a matter of changing the software controls.
Advantages of Flying Probe Tester
No special EOL Fixture required: The probes move accordingly
under software control to make contact with the required nodes, the “bed of
nails” and the fixture requirement is not needed. Rather a simple generic
mechanism to hold the board in place is needed.
Changes can be made easily: Due to the presence of
software control the pads also move accordingly and do not require manual
handling. It is not required to make any mechanical changes to the fixture.
Test Development time is not needed: Time is easily saved
because the first and foremost thing that has been put off is the mechanical
requirement that is not carried out. Due to the availability of software
control it is done easily.
Disadvantages of a flying probe:
Speed is slow – The flying probe is relatively slow as
compared to as compared to other forms of automated test equipment such as an
ICT because the probes have to physically move to each position in turn.
Complicated tests are not easy to perform through a
flying probe. It is necessary to check the performance of the individual flying
probe tester to ensure it can meet the requirements.
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