High-Frequency Noise Option*
AC Power line disturbances consist of these types in order of importance:
RMS sags (dips) and swells (60%)
Harmonics (harmonic distortion) (25%)
Transients (impulses) (10%)
High-Frequency Noise (5%)
There are frequencies above the range of conventional power harmonics that can be generated by certain types of loads, such as adjustable speed drives which generate high-frequency noise that is subsequently conducted along power circuits. Frequency content in this high-frequency region can have impacts on power systems. High-frequency noise can then become coupled into electronic circuits causing disruption and mis-operation.
The PowerSight High Frequency Power Line Noise Analysis Option (FAO) works with the PS4500 Power Quality Analyzer. It is a combination of hardware, firmware, and software that allows you to analyze the presence of high-frequency power line noise content from 3,000 Hz to 100,000 Hz, and 1 volt peak. The FAO option turns your PowerSight meter into a hand-held spectrum analyzer, as well as a power quality analyzer. This option is useful in determining whether power-line noise is causing disruption of equipment that may be sensitive to high-frequency noise.
We have supplied the FAO option in applications for sensitive bio-medical equipment, military applications, and industrial control such as in manufacturing plants that have a quantity of adjustable speed drives that due to the number of drives will generate high levels of high-frequency noise inside the plant. Our partner Environmental Potentials has more information on this type of application here: Variable Frequency Drives Application Note
The utility power company is not in general a major source of high-frequency noise and the long line lengths of power distribution cables rapidly attenuate any high frequency noise. However, utilities can be sources of high-frequency noise are as a result of switching operations whereby switch contacts that are old and deteriorated will result in less than optimum mating of contact surfaces that arc and spark as contacts come apart or come together.
The high frequency content of voltage and current can be evaluated simultaneously. To analyze the high-frequency content of power circuits you will need to plug voltage leads into the FAO voltage conditioning accessory and that plugs into your PS4000 or PS4500. To analyze the high frequency content of current, you will plug an HA1000 current probe into a special adapter cable that then plugs into your meter.
*Only compatible with PS4000/PS4500 meters and the HA1000 current probes.