Special Features:

Instrument consists essentially of a constant-impedance attenuator and a voltmeter by means of which the input to the attenuator is standardized, a switch controls the output voltage in decade steps, while an individually calibrated dial provides continuous control over each decade

Properties:

An item that, when used with an associated audio frequency signal generator, determines by comparison the output level of an audio frequency voltage. The meter is marked in volts or submultiples thereof. For items utilizing a meter the scale of which is marked in decibels or comparable units, and which do not require a driving oscillator, see meter, audio level. See also meter, modulation and meter, s-units.