EMC Test Design OFA-S Isotropic Omnifield Antenna, 30 MHz - 3 GHz

EMC Test Design OFA-S Description:

A unique broadband active E- field isotropic (spherically isotropic) antenna for RF spectrum monitoring. Connects to any spectrum analyzer, and has frequency response practically independent of antenna orientation or electric field direction. Offers medium sensitivity (suitable for environmental medium to high RF field strength monitoring) and broad dynamic range for the variety of RF regulatory, safety, EMC, wireless and telecommunications applications.  For higher sensitivity, look for OFA-SE antenna.

Omnifield Antenna® consists of three parts: antenna head, handle and power unit. Antenna head and handle comprise a single module while power unit is detachable from the handle to allow convenient storage in the supplied rugged plastic case. For normal operation handle must be connected to the power unit to provide power to the antenna head.  Antenna head has 3 antennas positioned normal to each other.  Signals from each antenna are combined and amplified to allow utput signal of Omnifield Antenna® to be proportional to the absolute value of the field regardless of the field direction.  Power unit contains the rechargeable  battery and connectors for the antenna and output cable. Ferrite beads, located on this cable, decouple the antenna from spectrum  analyzer and reduce the effects of this analyzer on measured field. This cable also allows operator to have freedom to place the antenna in right position either on non-metal table tripod (supplied with every system) or onto optional 5 feet adjustable non-metal tripod.

EMC Test Design OFA-S Specifications:

• Portable isotropic 3-axis EM field antenna with broadband response.
• Wide field dynamic range: 10 mV/m – 300 V/m @30-3000 MHz.
• Noise Level ~3 mV/m @ 1 GHz @ BW 1 KHz.
• Broad frequency range: 30 MHz- 3 GHz.
• Probe directivity: Omnidirectional.
• Calibration accuracy: +/- 1 dB.
• Linearity deviation Defined by SA.
• Typically, better than +/- 0.5 dB.
• Rotational isotropicity (typ.): +/- (1.5-3) dB.
• Recommended SA BW: 30 KHz (min BW 1 KHz )
• Special 1.5 m (5 ft.) low loss high flexibility cable (supplied with unit). Cable has multiple ferrite beads to minimize cable effects on the measured field

• Design: rugged portable enclosure. Antenna head is mounted on nonmetal handle with output connector detachable from the power unit.
• Probe clip and nonmetal portable tripod are provided. Operating temperature: 0 C° to 50° C, RH 10%-90%, noncondensing. Temperature error: <0.08 dB/°C.
• Dimensions: Antenna: (LxD) 225×70 mm,9.0×2.75 inch.
• Power unit: (LxWxD) 95x58x32 mm, 3.75×2.25×1.25 inch.
• Weight: Antenna: 0.66 lb. (300 g),
• Power Unit: 0.44 lb. (200 g).
• Battery operation time: 16 hr. NiMHd rechargeable battery.
• Charge, fast charge and low battery indicator.
• Calibration: Every antenna, cable and power module calibrated together with 5 feet cable for AF. NIST or UK NPL traceable
• Calibration Certificate is supplied with each unit.
• Accessories: Omnifield Antenna® comes in foam padded hard carrying case and includes the OFA-S antenna, PU-5S power module, cable, tripod, plastic clip and product documentation.

Calibration Details

• Every antenna, cable and power module calibrated together with 5 feet cable for AF.  UK NPL traceable Calibration Certificate is supplied with each unit.
• 1) Antenna Factors (AF) at 16 specified frequencies in the frequency range30 MHz-3000 MHz (@ 1 V/m)
• 2) Antenna Rotational isotropicity at every frequency.3) For Selective Spectrum Analyzer we provide a memory card with AF data.

– Keep unit calibrated. We recommend calibration once a year in our NIST traceable EMC Test Lab.

– To convert the electric field strength E (V/m) into power density S (uW/cm2) use formula: S=E2/3.77. To calculate the value of the magnetic field H (far field region) use the relationship: E/H=377 Ohm.