NARDA BROADBAND FIELD METER
NBM-520
Measuring electric
and magnetic
fields
ranging from high frequency
to microwaves
Non-directional measurement using
isotropic probes for applications in the
frequency range 100 kHz to 60 GHz
Intelligent probe interface with automatic
detection of probe parameters
for simple operation
Extra small and lightweight
Unbeatably easy 4-button operation
Auto zero ensures precision measurements
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DESCRIPTION
The Narda Broadband Field Meter NBM-520 is part of the NBM-500
family of test instruments. It measures non-ionizing radiation with utmost
accuracy and incorporates all the major basic measurement modes. In
contrast with the larger NBM-550, a memory for measurement results
has been deliberately left out of the NBM-520. The result is unbeatably
easy operation using just 4 buttons, so referring to the operating manual
is all but unnecessary.
Suitable measuring probes for electric and magnetic field strengths are
available for the frequency range from about 100 kHz up to 60 GHz. So-
called shaped probes which have frequency responses that weight the
results according to specific human safety standards are available in
addition to flat probes with flat frequency responses. All probes are
calibrated independently from the measuring instrument. They include a
non-volatile memory containing the probe parameters and calibration
data, so they can be used with any instrument in the NBM-500 family.
APPLICATIONS
Small, lightweight and rugged design –
ideal for use in rough environments
The NBM-520 is used to make precision measurements to establish
human safety, particularly in workplace environments where high electric
or magnetic field strengths are likely to occur. Some examples are:
• Measuring field strengths to comply with general safety
regulations
• Establishing safe zones
• Measuring field strengths in the industrial environment, such as
plastics welding equipment, RF heating, tempering, and drying
equipment
• Measuring and monitoring field strengths around broadcasting
and radar equipment
• Measuring field strengths of cell phone transmitters and satellite
communications systems to demonstrate compliance with
human safety standard limit values
• Measurements for protecting users of diathermy equip ment and
other medical devices that generate high-frequency radiation
• Measuring field strength in TEM cells and absorber chambers to
demonstrate electromagnetic compatibility (EMC)
Changing the probe is quick and easy,
with no need to reconfigure the device
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Probe model Battery level
FEATURES
The Narda Broadband Meter NBM-520 is designed for on-site use. The
concept focuses on simple operation and the range of functions has
been deliberately kept to the main features necessary for performing
precision field measurements.
Display and operation
– Operated by weatherproof foil keypad using just 4 buttons
with perceptible click point
– Backlit monochrome LCD with selectable illumination time,
easy to read even in bright daylight
Result display and evaluation
– 4 measurement modes selectable using the Mode button:
Instantaneous value (ACT)
Maximum (MAX)
Time average (AVG)
Spatial average (SPATIAL)
– Display units selectable using the Units button:
V/m, A/m, mW/cm
% of limit value when using shaped probes
– Hold button for “freezing” the display value
Automatic adjustment, application of calibration data
– Intelligent probe interface recognizes the NBM probe type and
automatically imports and applies the correction values stored
in the probe during calibration
– Fully automatic zero point adjustment with user definable time
interval
Warning functions
– Audible and visible warning signals for high field strengths:
Alarm threshold can be set from a PC
2
, W/m2 when using flat probes,
Status
Result
Result unit Field type
Everything at a glance. The clearly arranged
display is easy to read.
Mode
The optical interface connector and AC
adapter / charger connector compartment is
sealed with a rubber cap. The tilt stand
provided in addition to the tripod bush can be
used to place the instrument securely on a
flat surface.
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