AUSTIN, Texas--(BUSINESS WIRE)--The NI (Nasdaq: NATI) Board of Directors approved a quarterly dividend of $0.19 per share on the company’s common stock. This dividend is payable on Aug. 31, 2015, to stockholders of record on Aug. 10, 2015. About NI Since 1976, NI (www.ni.com) has made it possible for engineers and scientists to solve the world’s greatest engineering challenges with powerful, flexible technology solutions that accelerate productivity and drive rapid innovation. Customers from a