Measuring electric fields with shaped frequency response up to 50

Measuring electric fields with shaped frequency response up to 50
E stablished 1981
Advanced Test Equipment Rentals 800-404-ATEC (2832)
EA5091 EB5091 EC5091 ED5091
Measuring electric fields
with shaped frequency
response up to 50 GHz
using instruments in the NBM-500 family
Frequency shaping to match the ICNIRP,
FCC, IEEE or Safety Code 6 standard for
occupational/ controlled environment
Results are directly displayed in
“% of Standard“
Precise results without the need to know the
emitted frequency
Isotropic (non-directional) measurements
The probes contain 6 dipoles, three diode based and three thermocouple based dipoles. The correctly tuned overlap of two dipoles, one
acting as a high pass filter the other as a low pass filter, provides a
frequency sensitivity that mirrors a particular standard. Testing for
compliance to that standard is very easy to perform, since you no longer
have the need to know the emitted frequency.
Electric fields from 300 kHz to 50 GHz (3 MHz to 50 GHz with EB5091)
can be detected. The probes are particularly suitable for measuring
human safety limit values in mobile phone, telecom transmitter and
broadcasting environment.
The probes are calibrated at several frequencies. The correction values
are stored in an EPROM in the probe and are automatically taken into
account by the NBM instrument. Calibrated accuracy is thus obtained
regardless of the combination of probe and instrument.
NSTS 0807-E0239A-0.0
Subject to change
DESCRIPTION - Shaped Probes
The goal in designing and manufacturing a traditional, “flat” frequency
response probe is to make the probe equally responsive to energy at
every frequency within its rated frequency range. In contrast, Narda’s
patented shaped frequency response probes are designed and
manufactured so that their sensitivity mirrors a particular standard (or
guidance) as closely as possible.
For example, many of the major guidances and standards in the world
set E-field limits for maximum human exposure at 614 V/m (1000 W/m2)
at lower frequencies (~1 MHz). At frequencies of 30 to 300 MHz the
limits are typically much less, 61.4 V/m (10 W/m2), a difference of 20 dB
(100 times the power). A shaped frequency response probe designed
for such limits is 100 times more sensitive in the 100 MHz region, than
at 1 MHz.
If you were performing a survey of a site with a flat frequency response
probe that has both of the above frequency ranges and your survey
indicated 137 V/m (or 50 W/m2), it would be difficult to determine if the
site was out of compliance without turning one of the emitters off. Again,
given the example above, the site could be generating anywhere from
5% to 500% of the human exposure limit. There are many sites with
multiple emissions (rooftops, flight lines, broadcast towers) that have
emitters at different exposure limits.
If your interest is general safety measurements, to know if you comply
with an exposure limit or not, you will find shaped probes easy to use in
any environment. The display of total field strength with shaped probes
is not in terms of V/m or W/m , it is “% of Std.” So at a multiple emitter
site, a result of 15% is simple to understand. The total detected field
strength of each emitter (to its limit, at its frequency) has added up to
15%. Besides the ease of use, the main advantage is that you no longer
have the “need to know” the frequency when using a shaped probe.
Table: Standards and matching probe models
Standard or Guidance
U.S. FCC, 1997
Occupational/ Controlled
EA 5091
IEEE C95.1-2005
Controlled Environment
EB 5091
Canada Safety Code 6, 1999
RF/Microwave Worker
EC 5091
ICNIRP Rec. 1998
ED 5091
NSTS 0807-E0239A-0.0
Subject to change
Probe EA … ED5091
Frequency range
Type of frequency response
Measurement range
Dynamic range
CW damage level
Peak damage level
Sensor type
Readout mode / spatial assessment
Flatness of frequency response
Calibration uncertainty not included
Calibration uncertainty
Referred to 100 %
Isotropic response
Calibration frequencies
Recommended calibration interval
Temperature range
Non-operating (transport)
Electric (E-)Field
300 kHz to 50 GHz (EA5091, EC5091, ED5091)
Shaped, see table on page 2
0.5 to 600 % of Standard (Power Density)
30 dB
2000 % of Standard
32 dB above Standard
Combined diodes/ thermocouples
Isotropic (Tri-axial)
Combined 3-axis (RSS)
3 MHz to 50 GHz (EB5091)
700 mW/cm²
±2 dB from Standard
±1.5 dB (< 1.8 GHz)
±0.7 dB (1.8 GHz to 40 GHz)
±1 dB (@ 45.5 GHz)
±3 dB (< 4 % of Standard)
±1 dB (4% to 12 % of Standard)
±0.5 dB (12 % to 600 % of Standard)
typ. ±1 dB (≥ 10 MHz)
0.3/ 3/ 10/ 30/ 100/ 300/ 750 MHz
12 months
1/ 1.8/ 2.45/ 4/ 8.2/ 10/ 18/ 26.5/ 40/ 45.5 GHz
0 °C to +50 °C
-40 °C to +70 °C
5 to 95 % RH @ ≤25 °C
350 mm x 104 mm Ø
240 g
NBM-500 series meters
≤23 g/m³ absolute humidity
(a) Unless otherwise noted specifications apply at reference condition: device in far-field of source, ambient temperature 23±3 °C, relative air humidity 40% to 60%, sinusoidal signal
(b) Cutoff frequency at approx. -3 dB
(c) Pulse length 1µsec, duty cycle 1:1000
(d) Frequency response can be compensated for by the use of correction factors stored in the probe memory
(e) Accuracy of the fields generated to calibrate the probes
(f) Uncertainty due to varying polarization (verified by type approval test for meter with probe). Ellipse ratio included and calibrated for each probe
Part number P/N
Probe EA5091, Shaped E-field, FCC for NBM, 300 kHz - 50 GHz, isotropic
Probe EB5091, Shaped E-field, IEEE for NBM, 3 MHz - 50 GHz, isotropic
Probe EC5091, Shaped E-field, SC6 Canada for NBM, 300 kHz - 50 GHz, isotropic
Probe ED5091, Shaped E-field, ICNIRP for NBM, 300 kHz - 50 GHz, isotropic
Narda Safety Test Solutions GmbH
Sandwiesenstrasse 7
72793 Pfullingen, Germany
Phone: +49 (0) 7121-97 32-777
Fax: +49 (0) 7121-97 32-790
NSTS 0807-E0239A-0.0
Narda Safety Test Solutions
435 Moreland Road
Hauppauge, NY 11788, USA
Phone: +1 631 231-1700
Fax: +1 631 231-1711
Narda Safety Test Solutions Srl
Via Leonardo da Vinci, 21/23
20090 Segrate (Milano), Italy
Phone: +39 02 2699871
Fax: +39 02 26998700
Subject to change
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF