Narda EF 1891

The Narda EF 1891 is a selective electric-field probe engineered for precise electromagnetic field measurements across a broad frequency range. This tri-axial E-field probe delivers isotropic field strength assessment from 3 MHz to 18 GHz, making it suitable for EMF exposure monitoring, radiated emissions testing, and safety compliance verification in professional laboratories and field environments.

– Technical Specifications

Frequency Range: 3 MHz to 18 GHz

Measurement Range: 0.6 to 800 V/m (CW); 0.6 to 65 V/m (True RMS); up to 1,000 V/m with 64 dB dynamic range

Dynamic Range: 62 to 64 dB

Directivity: Isotropic (tri-axial)

Isotropic Deviation: ±1 dB (10 MHz to 5 GHz); ±2.25 dB (> 5 GHz to 18 GHz)

Electric Destruction Limit: 1,600 V/m (CW)

Temperature Range: -20 °C to +50 °C

Dimensions: 318 mm × 66 mm Ø

Weight: 90 g

– Key Features

• Three orthogonally arranged diode sensors capture spatial components of the electric field
• Multi-point calibration with correction factors stored in probe memory and automatically applied by the NBM meter
• Flat frequency response across full measurement band
• Foam-encased probe head optimized for sensor protection and RF performance
• Suitable for continuous-wave and modulated signal assessment

– Typical Applications

• Radiated emissions and immunity testing per IEC 61000-4-3
• EMF exposure assessment from broadcasting, telecommunications, and radar sources
• Human safety limit monitoring in occupational and public environments

– Compatibility & Integration

Operates with any NBM basic unit including the NBM-520 and the FieldMan Field Meter.