NTI’s FFT voltmeter HGT1 is primarily designed for professional acoustical test applications. For step and touch voltage and ground impedance measurements, the HGT1 is delivered with  an OMICRON software which allows measuring the frequency-selective voltage level by using a real time Zoom FFT. The HGT1 works as an add-on device to the CPC 100 and CP CU1. This User Manual describes in detail the OMICRON-specific HGT1 functions and measurements.