Analog current signal sampling circuit

Abstract

Abstract PURPOSE:To simplify the circuit constitution of a sampling circuit and to reduce the cost by forming a short circuit between a current signal source and a current/voltage converter, and providing a current signal selecting function. CONSTITUTION:The current signal source 1 is connected to an A/D converter 3 through the current/voltage converter 2. The short circuit 4 for short-circuiting (grounding) the output signal of the current signal source 1 and a signal passing circuit 9 are provided between the current signal source 1 and current/voltage converter 2. Those circuits 4 and 9 are composed of transistors (TR) 5 and 10, etc., and the current signal source 1 is short-circuited or connected by make/ break control over a relay contact 7 and voltage impression to base terminals b1 and b2. Reciprocal signals are inputted to the base terminals b1 and b2 to exhibit an optional circuit function.

Inventors

• 👤 Shoji Matsuda
• 👤 松田　正二

Bibliographic Details