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

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Narda ELT-400 Exposure Level Tester
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Narda ELT-400 Exposure Level Tester Narda ELT-400 Exposure Level Tester
Narda ELT-400
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Manual ELT-400 Datasheet Brochure Accessory Kit
The Narda ELT-400 Exposure Level Tester is an innovative exposure level meter for measuring magnetic fields in the workplace and in public spaces. The model is designed for health and safety professionals in industry, the insurance business and the service industry. The instrument can handle practically any level measurement requested in the low and medium-frequency range, simply and precisely. It is comparable to the sound level meters that are commonly used in the assessment of noise at the workplace.
Narda ELT-400 Features
  • 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
Narda ELT-400 Specs
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
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
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
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
Narda ELT-400 Applications
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.