ICT / MDA Loaded Board Electrical Test Systems
Testronics Model 406A
Low Cost Loaded Board MDA Manufacturing Defects Analyzer
The 406A is designed to target the highest number of assembly failures for the least amount of capital equipment cost, programming time, and maintenance costs. The precision Stimulus Measurement Unit provides AC/DC analog measurements that are accurate, stable, repeatable, and reliable. Fault coverage is maximized by using unlimited power, return, and guard points during the measurements. The non-muxed, pure pin, 6-wire switch matrix is configured for high accuracy and easy programming. Low cost industry standard GR2270 vacuum fixture kits interface with the ruggedized 406A receiver.
The 406 WinTOS software [test executive] supports external program calls. This means a customer can write an application specific .exe program. This exe program can do things like control IEEE instruments, power supplies, frequency counters, etc. They place the .exe inside the WinTOS test program along with any arguments necessary. The 406 will perform all of the standard analog in-circuit measurements, then it will call their .exe when it reaches that point in the program. WinTOS will then spawn the exe along with arguments. The exe executes. When the exe is finished it exits passing arguments [pass, fail, measured results, etc] back to WinTOS. We then continue with the WinTOS test program performing any additional 406 tests or even additional exe tests. WinTOS supports conditional branching so they have a lot of flexibility to run different exe's based on prior test results.
This is the technique we use with a major automotive radio manufacturer. We use our standard test program to check for all of the process faults. We also power up the assembly and make several voltage measurements using an HP IEEE power supply and a Kiethley IEEE DVM. (WinTOS supports IEEE instruments from inside the test program without having to use an exe.) While the board is powered up, we spawn an exe that writes digital signals to the VF display, thereby changing the display's segments. The exe controls two National Instruments digital I/O cards. This is typically how we use the 406 as a combinational test system.
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