Narda ELT-400 Exposure Level Tester | 1 Hz - 400 kHz

The Narda ELT-400 is an innovative exposure level tester developed for measuring magnetic fields in the workplace and in public spaces. It can handle practically any level measurement requested in the low and medium-frequency range, simply and precisely.

The Narda ELT-400 performs direct evaluation of field exposure in relation to major standards and regulations such as Directive 2013/35/EU for workplaces. It also performs automatic exposure analysis for various waveforms in compliance with weighted RMS and weighted peak methods and eliminates the overestimation that occasionally occurs with FFT-based evaluation. This tester is IEC/EN 62311 and 62233 standard compliant.

Product Info Product Options Related Compliance Standards Related Products

Magnetic (B-) Field
Sensor System	Coil (100 cm²)
Measurement Axis	Tri-Axial (isotrop)
Exposure STD Mode
Frequency Range (-3dB), selectable	1 Hz to 400 kHz, 10 Hz to 400 kHz, 30 Hz to 400 kHz
Exposure Evaluation	Compared to Standard
MODE	ICNIRP		BGV B11		EN 50366
RANGE	LOW	HIGH	LOW	HIGH	LOW	HIGH
Overload Limit	160%	1.600%	160%	1.600%	160%	1.600%
Nominal Range	10%	100%	10%	100%	10%	100%
Noise Level, approximate	1.3%	6%	0.4%	6%	0.4%	6%
Damage Level RMS (Peak)	160 mT (226 mT)
Resolution (RANGE: LOW)	0.001 %
Detection, selectable	Automatic according to selected Standard or RMS (averaging time 1 s) or Peak Value
Field Strength Mode
Frequency Range (-3dB), selectable	1 Hz to 400 kHz, 10 Hz to 400 kHz, 30 Hz bis 400 kHz
Frequency Response	Flat
MODE	320 µT		8 mT		80 mT
RANGE	LOW	HIGH	LOW	HIGH	LOW	HIGH
Overload Limit	32 µT	320 µT	800 µT	8 mT	8 mT	80 mT
Nominal Range	2 µT	20 µT	50 µT	500 µT	500 µT	5 mT
Noise Level, approximate	70 nT	320 nT	1.8 µT	8 µT	18 µT	80 µT
Damage Level RMS (Peak)	160 mT (226 mT)
Resolution (RANGE: LOW)	1 nT
Overall Uncertainty	±4 % (50 Hz to 120 kHz)
Detection, selectable	RMS (averaging time 1 s) or Peak Value
Display Mode, selectable	Instantaneous or Max Hold
Output
Analog Scope Output	Three Channel (X-Y-Z)
Output Level	50 mV rms at scale final value of Nominal Range (Impedance: 50 Ohm, nominal)
Interface (Remote Control and Readout)	RS-232 (19200 baud, 8n1, XON/XOFF), 3-Wire, Stereo Jack 2.5 mm

Direct evaluation of field exposure in comparison to major standards
Automatic exposure evaluation for various waveforms
Eliminates the overestimation occurring occasionally with FFT-based evaluation
Ultra wide frequency range (1 Hz to 400 kHz)
Wide measurement range (up to 80 mT, type-depending)
Isotropic 100 cm²-probe (complies with standards)
Three-axis analogue signal output

Production Area
- The Narda ELT-400 Exposure Level Tester is useful with diverse machinery used in manufacturing. This includes induction heating, melting and hardening equipment. Also - thanks to the extremely low frequency limit and high power capability - most magnetic stirrers can be measured. Special demands often occur with machinery in production areas where non-sinusoidal signals are common, e.g. in industrial applications that use resistance welding machinery (pulse waveform, phase angle control) with traditional 50/60 Hz systems as well as in newer medium-frequency switching units.
General Environment
- In public spaces, complex fields occur with several kinds of electronic article surveillance systems. Most of the electromagnetic and acustomagnetic gates are operated in the frequency range of the Narda ELT-400.
EMC Test House
- Magnetic fields generated by household appliances or other electrical devices are receiving increased attention. Some new standards such as EN 50366 describe how to investigate such products. The Narda ELT-400 is the ideal measuring device when it comes to compliance with these standards. Benefits include the perfectly matched frequency range and implementation of the specified transfer function. The aim of this new generation Narda ELT-400 is to greatly simplify the assessment process. With the EXPOSURE STD (Shaped Time Domain) mode, the instrument achieves a new standard in simple but reliable measurement of magnetic fields, whether straightforward or in very complex field environments. Time-consuming and easily misinterpreted measurements with a spectrum analyzer or a scope are rendered obsolete. Detailed knowledge about the evaluation procedure or the field waveform or frequency is no longer needed. The results are reliable, and speed and ease of use are significantly improved over all traditional methods.