Downloaded from https://www.everyspec.com MIL-STD-1311D AMPLIFICATION FACTOR 1. Methods of determination. The amplification factor shall be determined statically by computing the ratio of the increments of the change in anode voltage and control electrode voltage at a fixed anode current or measured directly by means of the voltage- ratio method shown in figure 1316-1 or by an equivalent method. 2. Voltage-ratio method. The voltage-ratio method utilizes a system of transformers, capacitors, and attenuators to supply three independent, properly phased, and adjusted ac voltages (normally 1,000 Hz) from a common source.
The ac (rms) voltage E1, E2, and E3 shall be in phase and the output resistance of the attenuators made small by proper design in order to neglect the voltage METHOD 1316A drop due to electrode currents. The voltage ratio E2/E1 shall be accurately determinable. When a null is reached, 1 2 E E = µ . The amplification factor shall be within the limit(s) specifed. FIGURE 1316-1. Simplified circuit for measuring amplification factor. METHOD 1316A 1316-1 25 March 1970