Phase Measurement

Information from Newtons4th Ltd

The relative phase of two signals is a measure of the time difference between them expressed as an angle. If the two waveforms have no relative displacement they are said to be in phase (phase angle = 0°). If there is a phase difference it is expressed with reference to one of the signals. The phase angle may be expressed in the range of +180° to -180°, or 0°: to 360° or 0° to -360°. For the phase measurement to be stable, the two signals must be at the same frequency or harmonics of the same frequency.

Phase is measured with a two input instrument such as a phase meter, or phase selective voltmeter (vector voltmeter), or frequency response analyser (gain/phase analyser). One input is designated the reference and the phase of the other input is expressed relative to the reference. Instruments from Newtons4th Ltd measure phase using a Discrete Fourier Transform method which gives accurate results even with distorted or noisy signals.

Our Products

Netwons4th Ltd offer two solutions for phase measurement: the QuanteQ and Veqtor.

QuanteQ and Veqtor both offer a frequency range of 100µHz to 2.4MHz and can automatically sweep the frequency to generate a graph of phase against frequency. The graphs are visible on the graphic displays, or may be printed out, or read into a computer over RS232 (IEEE488 as option). QuanteQ has high voltage capability to 500V peak cat II; Veqtor has input ranges from 1mV to 10V and a phase accuracy of better than 0.1° at 100kHz and better than 1° at 1MHz.

Both Veqtor and QuanteQ offer other measurement capability as well as phase measurement.

Brochure & Specifications

Visit the Newtons4th.com website for full details of the QuanteQ and Veqtor including PDF brochures and technical specifications.

Next steps

Contact our sales department to discuss your requirements, or view our full product catalogue.