MAK-6571C Automatic Distortion Meter

The MAK-6571C is designed to speed up measurement of distortion in radio sets, stereo amplifiers, tape recorders, and other audio equipment. Measurements of the total harmonic distortion, THD, at 400Hz or 1000Hz (automatic changeover) can be easily made. An advantage of this instrument is the ability to measure distortion even when there is a small variation in the input signal level.