Patent ID: 7843444

Claim:
A Video Graphics Array (VGA) interface tester for testing a VGA interface, comprising: a VGA connector configured to couple to the VGA interface, the VGA connector having a plurality of signal pins to output different VGA signals, the signal pins comprising a red signal pin, a green signal pin, a blue signal pin, a horizontal synchronization signal pin, and a vertical synchronization signal pin; a load circuit connected to the signal pins of the VGA connector for impedance matching, the load circuit comprising five resistors connected between the signal pins of the VGA connector and ground respectively; a selection switch having a plurality of throws corresponding to the signal pins of the VGA connector connected to the signal pins of the VGA connector respectively, and a pole; and a test port connected to the pole of the selection switch for selectively testing one of the VGA signals via selection of the selection switch; wherein resistance of each of the three resistors connected to the red, green, and blue signal pins of the VGA connector respectively is 75 ohms, and resistance of each of the rest of the resistors connected to the horizontal synchronization and vertical synchronization signal pins of the connector respectively is 2.2 Kohms.