TF2331A Distortion Factor Meter

The TF2331A is a wide band (100 kHz) voltmeter combined with a variable frequency notch filter. A reference is set at 100 % and the filter is then used to remove the fundamental frequency. The residue (distortion factor) is indicated on the panel meter.

Distortion factor is not the same as THD as all in-band signals are measured, including noise and non-harmonically related components. Nevertheless, it is an excellent instrument for evaluating the performance of amplifiers and other systems. The TF2330 series of wave analysers can be used for a proper evaluation of THD.