NAI's 2250A Phase Angle Voltmeter is the most accurate and versatile AC measurement tool in the Synchro/Resolver and LVDT/RVDT marketplace. Considered the industry standard and based on the latest DSP and FPGA technologies, the 2250A substantially extends and simplifies the capabilities of the legacy 2250 model.

This precision instrument measures total, fundamental, harmonics, in-phase, quadrature, frequency, THD, ratio, and phase angle, and displays all of these measurements at the same time. The isolated inputs enable null, ratio, and gain measurements. This instrument is ideally suited for defense, commercial aerospace, and industrial applications.

refer to https://www.naii.com/Phase-Angle-Voltmeter-Industry-Standard/P270