![]() Go to the 64 channel signal conditioning card to select and amplify the signal, and finally connect to the test jet system to measure the signal strength. ![]() The signal passes through the capacitive coupling between the IC frame and the sensing board, then through the amplifier on the sensing board. The system sends a 200mV, 10KHz signal from the test point to the IC pin. In order to conduct the test, the IC test jet uses the sensor plate on the fixture to press on the IC the sensor plate’s shape and area are the same as the IC shell. Then use the capacitance between the sensing board’s copper foil and the IC foot frame to check the open circuit of the pin.
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