Patent ID: 8269506

Claim:
A signal integrity test method applied in a control computer, the control computer in electronic communication with an oscilloscope, a time domain reflectometer (TDR), and a mechanical arm, the method comprising: (a) receiving test parameters of a signal transmitted on a printed circuit board (PCB) and a reference value range of each test parameter set by a user; (b) analyzing a test file stored in a storage device of the control computer, to acquire information about one or more transmission lines on the PCB; (c) selecting a transmission line on the PCB; (d) reading coordinate information of a test point on the transmission line; (e) generating a first command according to the coordinate information of the test point, and controlling the mechanical arm to position probes of the oscilloscope on the PCB according to the first command; (f) acquiring a value of each test parameter of the signal on the test point tested by the oscilloscope, comparing the value of each test parameter with the reference value range of the test parameter, to determine if the value of each test parameter falls within the reference value range of the test parameter; (g) determining the test point passes the test and going to block (i) if the value of each test parameter falls within the reference value range of the test parameter, or going to block (h) if the value of any test parameter falls out of the reference value range of the test parameter; (h) using the TDR to test an impedance value of the test point, and determining if the impedance value falls within the impedance reference value range of the transmission line, to determine if the test point passes the test; and (i) determining if there is any test point on the transmission line that has not been tested according to the information about transmission lines recorded in the test file, ending the test if all test points have been tested, or returning to block (d) if any test point on the transmission line has not been tested.