NIM-511 Industrial Radiation Field Meter

Industrial Field Radiation Meter with Dual Sensor Probes For Measuring Electric And Magnetic Fields In Industrial Environments. 

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  • Specifications
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Designed to make measurements a simple process, the Narda Model NIM-511 combines an unprecedented ease of operation with powerful measurement capabilities.

It provides the industrial plant manager and safety professional with an accurate and inexpensive solution for proving compliance with regulations that cover exposure to RF radiation. The NIM-511 model provide a complete measurement system comprised of an extremely easy to operate meter and a probe that contains sensors to measure both the electric (E) and magnetic (H) field components of an electromagnetic wave.

There is no need to change probes to measure the electric and magnetic fields as the probe contains two sets of sensors that seperately measure each field. Simply press the E/H Field key combination to change the field that you want to measure.

The Narda Safety Test Solutions NIM-511 Industrial Radiation Field Meter is available at all Air-Met offices for sale only. 

The Narda NIM-511 Industrial Field Meter Features: 
  • Complete Measurement System with Dual Electric and Magnetic Field Probe for Frequencies up to 100 MHz
    There is no need to change the probes as the probe contains two sensors that seperately measure each field.
  • Covers Most Industrial Equipment
    Measures both the electric and the magnetic field components (E and H fields) for equipment operating below 300 MHz. The NIM-511 has a much broader sensor than the NIM-513 Meter that operates from 300 kHz to 100 MHz and is adjusted to
    the reference calibration frequency at 13.56 MHz. 
  • No confusing scales. Simply read the digital display including the unit of measurement
  • No difficulty zeroing with the Auto Zero executed repetitvely every 15 minutes
  • Fast and Reliable Measurements
  • Extremely Easy to Use
  • Low Cost, Compact and Lightweight
NIM-511 Industrial Field Meter Specifications
Display and Functions  
Display Type Transflective LCD, monochrome, LED backlight 
Display Size 4 cm (1.5”), 128 x 64 dots 
Refresh Rate 400 ms
Result Display E-field or H-field value (selectable, 4 digits) 
Result Units
mW/cm, W/m2, V/m, A/m 
Result Types (isotropic, RSS)
ACT - displays the actual value
MAX - holds the maximum of the measured values
AVG - displays the 6 min time averaged result
SPATIAL - displays a spatially averaged result
Hold Hold button to freeze the value that is currently displayed 
Zeroing Automatic zeroing after power-on and repetitively every 15 min
Field Type Electric (E-) field and magnetic (H-) field 
Frequency Range
300 kHz to 100 MHz  
Measurement Range
E-field: 0.1 to 100 mW/cm2 (20 to 614 V/m)
H-field: 0.2 to 200 mW/cm2 (0.073 to 2.3 A/m) 
CW Damage Level 50 W/cm2
Sensor Type
Two diode based systems for E-field and H-field 
Directivity Isotropic (Tri-axial) 
Readout Mode / Spatial Assessment Combined 3-axes (RSS) 
Flatness of frequency response (calibration uncertainty not included)
±0 dB @ 13.56 MHz
±1.5 dB (300 kHz to 100 MHz)
±0 dB @ 13.56 MHz
±0.6 dB (300 kHz to 100 MHz) 
Calibration Uncertainty ±0.5 dB 
Lineraity (Referred to 10 mW/cm²
±1 dB (0.5 to 2 mW/cm²)
±0.5 dB (2 to 100 mW/cm²) 
Isotropic Response ±1 dB 
Temperature Response +0.8 dB (10°C to 40°C) 
Calibration Frequencies 0.5/ 13.56/ 27.12/ 90 MHz
Recommended Calibration Interval 24 months
General Specifications
Battery NiMH rechargeable batteries, 2 x AA size (Mignon), 2500 mAh, included 
Operation Time Approx 22 hours
Charging Time 2 hours
Battery Level Display 100%, 80%, 60%, 40%, 20%, 10%, low level (< 5%) 
Temperature Range
Non-Operating (transport)

-10 °C to +50 °C
-30 °C to +70°C 
5 to 95 % RH @ ≤28 °C, non condensing
≤26 g/m³ absolute humidity (IEC 60721-3-2 class 7K2) 
Size (h x w x d) 

1.5” x 2.0” x 8.1” (38 x 52 x 205 mm)
16 inches long (410 mm)
44 inches long (1.1 m) 

0.66 lbs (300 g)
0.68 lbs (310 g) 
Accessories (included)
Hard case, power supply, rechargeable batteries, shoulder strap, operating manual,
certificate of calibration 


The NIM-511 industrial radiation field meter is suitable for major safety standards worldwide require that both the electric and the magnetic field components (E and H fields) be measured for equipment operating below 300 MHz. 
  • RF Heat Sealers and Vinyl Welders
  • Semiconductor Process Equipment and Glass Deposition
  • RF Induction Heating
  • Dielectric Dryers and Heaters
  • Plasma Generation Systems