Title :
Performance evaluation of a new audio-frequency power bridge
Author :
Waltrip, B.C. ; Oldham, N.M.
Author_Institution :
Nat. Inst. of Stand. & Technol., Gaithersburg, MD, USA
Abstract :
Several techniques for measuring active and reactive power in the 50-Hz to 20-kHz frequency range are described. These approaches were developed to evaluate a new high-accuracy, audio-frequency power bridge that is based on AC voltage and impedance measurements. The results indicate that its uncertainties are within the expected +or-200 p.p.m. for active power. The bridge and a high-precision sampling wattmeter constructed using two sampling digital voltmeters are described. A dual-channel digitally synthesized source was used to verify measurements at zero power factor.<>
Keywords :
bridge instruments; electric impedance measurement; measurement standards; power measurement; voltage measurement; wattmeters; 50 Hz to 20 kHz; AC voltage; active power; audio-frequency power bridge; dual-channel digitally synthesized source; impedance measurements; reactive power; sampling digital voltmeters; sampling wattmeter; uncertainties; Bridge circuits; Frequency conversion; Frequency measurement; Impedance; Power measurement; Reactive power; Sampling methods; Testing; Voltage measurement; Wattmeters;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.109962
