New Update on the EF-1891 Probe for the Narda NBM-500 Series

The EF-1891 antenna for the NBM-500 series enables measurements from 3 MHz to 18 GHz and is compatible with the NBM-520 and NBM-550 broadband meters. With three orthogonally arranged dipoles with detector diodes, the probe can output three voltages individually at the probe output corresponding to the spatial components, with the resulting isotropic field strength calculated by the NBM base unit. The NBM E-Field Probe’s dynamic range, spanning from 0.6 V/m to 800 V/m (62 dB), renders it perfectly suited for measuring exposure levels in both public and occupational environments. To further improve on the probe’s capabilities, Narda has announced a new version of the EF-1891 with updated specifications as shown in the comparison table below.

Key features of the EF-1891 probe include:

Flat frequency response
Diode sensors
Isotropic (non-directional) measurement
Multi-point calibration
Modular, can be used with any NBM basic unit including the NBM-520 and discontinued NBM-550
Measurements for general public and occupational field exposure from radio broadcasting, telecommunication, and radar
62 dB dynamic range without changing measurement range

EF-1891 Electric Field Probe Specifications Comparison


EF1891	2402/02B (old)		2402/02C (new)
Measurement range	0.6 bis 1000 V/m (CW) 0.6 bis 35 V/m (True RMS)	100 nW/cm² bis 265 mW/cm² (CW) 100 nW/cm² bis 325 μW/cm² (True RMS)	0.6 bis 800 V/m (CW) 0.6 bis 65 V/m typ. (True RMS)	0.1 μW/cm² bis 170 mW/cm² (CW) 100 nW/cm² bis 325 μW/cm² (True RMS)
Dynamic range	64 dB		62.5 dB
CW damage level	1600 V/m	700 mW/cm²	1100 V/m	320 mW/cm²
Peak damage level	16 kV/m	70 W/cm²	1400 V/m	520 mW/cm²
Flatness of frequency response Calibration uncertainty not included	±1 dB (10 MHz bis 3 GHz) +2/ -1 dB (3 bis 7 GHz) +3/ -1 dB (7 bis 11 GHz) +3/ -4 dB (11 bis 18 GHz)		typ. +2 dB/-2 dB @ 3MHz typ. -3 dB @ 18 GHz +1/-1.5 dB (10 MHz bis 3 GHz) +2/ -1.5 dB (>3 GHz bis 11 GHz)
Linearity Referred to 0.2 mW/cm² (27.5 V/m)	±3 dB (0.8 bis 1.65 V/m) ±1 dB (1.65 bis 3.3 V/m) ±0.5 dB (3.3 bis 300 V/m) ±0.8 dB (300 bis 1000 V/m)	±3 dB (170 bis 720 nW/cm²) ±1 dB (720 nW/cm² bis 2.9 μW/cm²) ±0.5 dB (2.9 μW/cm² bis 24 mW/cm²) ±0.8 dB (24 bis 265 mW/cm²)	±2 dB (0.6 bis 4 V/m) ±0.5 dB (4 bis 300 V/m) ±2 dB (300 bis 800 V/m)	±2 dB (0.1 bis 4.2 μW/cm²) ±0.5 dB (4.2 μW/cm² bis 24 mW/cm²) ±2 dB (24 mW/cm² bis 170 mW/cm²)
Isotropic response	±1 dB (27 MHz bis 1 GHz) ±2 dB (1 GHz bis 18 GHz)		±1 dB (10 MHz bis 5 GHz) ±2.25 dB (>5 GHz bis 11 GHz)

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Date and Time

Fri. 12 Apr 2024

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Australia

New Update on the EF-1891 Probe for the Narda NBM-500 Series

Narda NBM 500 Series EF-1891 Probe Update

EF-1891 Electric Field Probe Specifications Comparison

Compatible Broadband Meters

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Interested in learning more about the NBM-500 series and probes? Reach out to our friendly team for assistance

Date and Time

Location