High-Frequency Noise Option*

High Frequency Analysis Option

$ 1,345

Model No: FAO

AC Power line disturbances consist of these types in order of importance as an approximate %:

The PowerSight High Frequency 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.

The FAO is designed to measure continuous high-frequency noise. 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 connect the FAO to a PS4500. To analyze the high-frequency content of current, connect an HA1000 current probe into a special adapter cable that then plugs into your PowerSight PS4500 meter.

High-frequency noise describes frequencies above the range of conventional power harmonics – in the tens of kHz and higher. High-frequency noise is generated by certain types of loads (sources) and this noise is subsequently conducted along power conductors and circuits. It has the potential to affect other devices connected to the same circuits.

Continuous high-frequency noise generation comes from electronic sources such as lighting systems, adjustable speed drives, and UPS systems. Other devices that perform rectification of AC into DC also have the potential to generate high-frequency noise continuously. Non-electronic sources are poor wiring, or poor connections, bad contact problems. For example, intermittent connections or loose fuse or breaker connections at panels can generate continuous high-frequency noise as they age and degrade. High-frequency noise can have adverse impacts on power systems and equipment by capactively coupling into electronic circuits causing disruption and mis-operation.

We have supplied the FAO option in applications where high-frequency noise can affect sensitive electronics, or affect precise measurements or specialized manufacturing processes, or would interfere with communication signals.  This includes sensitive bio-medical measurement equipment, military communication applications, and industrial control in manufacturing plants that have high populations of adjustable speed drives. High levels of high-frequency noise can occur inside a manufacturing plant as a result of the aggregation of the noise from many individual drives . Our partner Environmental Potentials has more information on this type of application here: Variable Frequency Drives Application Note

The utility power company generally is not a major source of high-frequency noise. The long line lengths of power distribution cables would rapidly attenuate any high frequency noise. However, utilities can be sources of high-frequency noise as a result of switching operations. 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, but these are transient phenomena. Transient events can be captured by the PS4500 Power Quality Analyzer down to 8us.


*Only compatible with PS4000/PS4500 meters and the HA1000 current probes.