Milliwatt Test Set 10 Hz to 100 MHz

The milliwatt test set, model EPM-1 provides precise level measurements in the frequency range 10 Hz to 100 MHz or 300 MHz with somewhat reduced specifications. In order to attain the highest accuracy, the measurement range is reduced to a narrow spread on both sides of a 0-dBm center value. The instrument consists of the basic unit and a test probe connected directly to the point of measurement. Thus, errors that might be caused by a pickup cable are eliminated. Measurement is made by a thermocouple protected from burnout by a phototransistor overload sensor. The instrument may also be used as a constant-output amplifier. Methods of calibration, choice of impedance levels, and applications are discussed.