Patent ID: 7358717
Filing Date: 2008-04-15
Classification: G01R

Abstract:
1. In a current probe having inputs coupled in series across a non-conductive gap in a device under test with the current probe inputs coupled to a current sensing circuit for receiving a current signal from the device under test, an input by-pass circuit comprising: a switching circuit coupled between the current probe inputs and the current sensing circuit having first and second switches with each of the first and second switches having a common terminal coupled to the one of the current probe inputs, a first terminal coupled to the current sensing circuit and a second terminal coupled to the other of the current probe inputs with the other of the current probe inputs coupled to the sensing circuit such that the first and second switches couple the current signal to the current sensing circuit when the common switch terminals of the first and second switches are coupled to the first terminals of the first and second switches, and the first and second switches couple the current signal between the current probe inputs when the common switch terminals of the first and second switches are coupled to the second terminals of the first and second switches; and a switch control coupled to the switching circuit for selectively coupling and decoupling the current probe inputs to the current sensing circuit such that the current signal continuously flows in the device under test.