but we cannot measure input impedances and output impedances. The capacitance and the resistance build as frequency-dependent form a complex resistance, the so-called impedance Z. The nominal impedance is in electrical engineering and electro-acoustic (audio), the frequency-dependent impedance at the...
The prices of HP’s ?rst products, such as the resistance–capacitance audio oscillator (HP 200A), an electronic instrument used to test sound equipment, were less than one third of rivals’ products, with equivalent quality. In the US in the 1940s, products of the ?edgling company won ...