SIGMA DISTORTION METER DSM-201 is meant for measuring the harmonic distortion of any signal. It may be caused due to non-linearity of characteristics of an Amplifier, or any type of electronic circuit or may be noise generated in the circuit.

The DISTORTION METER DSM-201 a highly selective balancing network is used to eliminate the fundamental frequency in the 20Hz to 20kHz band. The distortion products are fed to a stable high-gain wideband amplifier for indication on the meter. The amplifier is effective up to 200KHz and measurements are possible up to and including the tenth harmonic of 20KHz.

Range	2%, 20% & 100% in Full Scale
Accuracy	± 2% of Full Scale
Range Of Frequency	20 Hz to 20KHz (fundamental) in three bands
Input voltage range	1V to 5 volt
Input Impedance	100Kilo ohm; less than 5OpF in shunt
Fundamental rejection	Over 60 dB
Residual Distortion	Less than 0.05%
Power Supply	220volts / 50Hz; ± 10%