Narda BFD-400 Digital H-Field Probe Series

1 Hz - 400 kHz

The Narda BFD-400-1 and BFD-400-3 is a magnetic field probe designed for isotropic measurements of magnetic flux density across 1 Hz to 400 kHz. It pairs with the Narda FieldMan for field strength readings and signal analysis. With a 100 cm² (BFD-400-1) and 3 cm² (BFD-400-3) sensor, 70 dB dynamic range, and spectrum mode with limit value curves, it’s ideal for evaluating worker exposure, testing electromagnetic fields, and industrial applications such as electric welding and automotive environments.

This is a replacement for Narda ELT-400.

Product Info Related Products

Model	BFD-400-1	BFD-400-3
Frequency Range	1 Hz - 400 kHz
Sensor Type	Isotropic (3-axis) magnetic field sensor
Sensor Area	100 cm²	3cm²
Key Measurement Methods	WRM (Weighted RMS), WPM (Weighted Peak)
Measurement Modes	Field Strength, Spatial Average, Timer Logging, Spectrum, Shaped Time Domain, Scope (future)
Spectrum Resolution	Up to 0.625 Hz (4096 points FFT)
Filters	Lowpass, High pass, Bandpass (10% BW), Band stop (5% BW), Low-cut (1/10/30 Hz)
Detectors	RMS, Peak
Field Strength Range	80 µT, 800 µT, 8 mT, 80 mT
Noise Levels	Down to 38 nTRMS depending on range
Resolution	0.1 nT - 0.1 µT depending on range
Streaming Interface	USB 2.0, up to 1.024 MSps
Operating Temperature	-20 °C - +50 °C
Humidity	< 29 g/m³ (< 93% RH at 30 °C), non-condensing
Ingress Protection	IP54
Size	296 mm x 125 mm Ø
Weight	240 g

Isotropic (direction-independent) measurement with 100 cm2 and 3 cm2 sensor
Wide frequency range from 1 Hz to 400 kHz with high dynamic range of 70 dB
Spectrum mode with displayed limit value curve
Shaped time domain evaluation STD (WPM and WRM) for all relevant international standards and regulations such as Directive 2013/35/EU
Adjustable narrow filter for the digital LF probes (bandpass or bandstop)
Scope mode for displaying the LF field progression over time
Digital probe interface - no more counter calibration
Self-test of the probe interface with integrated sensor function test
Wide temperature range