Atec EA5091, EB5091, EC5091, ED5091 User Manual

E-FIELD PROBES

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.

APPLICATIONS

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.

CALIBRATION

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.

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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/m
at lower frequencies (~1 MHz). At frequencies of 30 to 300 MHz the
limits are typically much less, 61.4 V/m (10 W/m
(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/m
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
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.

2

), it would be difficult to determine if the

2

, it is “% of Std.” So at a multiple emitter

2

), a difference of 20 dB

2

)

Table: Standards and matching probe models

Standard or Guidance Level Model

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 Occupational ED 5091

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SPECIFICATIONS a

Probe EA … ED5091 Electric (E-)Field

Frequency range
Type of frequency response Shaped, see table on page 2
Measurement range
Dynamic range 30 dB
CW damage level 2000 % of Standard 700 mW/cm²
Peak damage level
Sensor type Combined diodes/ thermocouples
Directivity Isotropic (Tri-axial)
Readout mode / spatial assessment Combined 3-axis (RSS)

UNCERTAINTY

Flatness of frequency response

Calibration uncertainty not included

Calibration uncertainty

Linearity

Referred to 100 %

Isotropic response

GENERAL SPECIFICATIONS

Calibration frequencies 0.3/ 3/ 10/ 30/ 100/ 300/ 750 MHz 1/ 1.8/ 2.45/ 4/ 8.2/ 10/ 18/ 26.5/ 40/ 45.5 GHz
Recommended calibration interval 12 months

Temperature range
Operating
Non-operating (transport)

Humidity 5 to 95 % RH @ ≤25 °C ≤23 g/m³ absolute humidity
Size 350 mm x 104 mm Ø
Weight 240 g
Compatibility NBM-500 series meters

(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

(b)

(c)

(d)

(e)

(f)

300 kHz to 50 GHz (EA5091, EC5091, ED5091) 3 MHz to 50 GHz (EB5091)

0.5 to 600 % of Standard (Power Density)

32 dB above Standard

±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 °C to +50 °C

-40 °C to +70 °C

ORDERING INFORMATION

Probe EA5091, Shaped E-field, FCC for NBM, 300 kHz - 50 GHz, isotropic 2402/07

Probe EB5091, Shaped E-field, IEEE for NBM, 3 MHz - 50 GHz, isotropic 2402/08

Probe EC5091, Shaped E-field, SC6 Canada for NBM, 300 kHz - 50 GHz, isotropic 2402/09

Probe ED5091, Shaped E-field, ICNIRP for NBM, 300 kHz - 50 GHz, isotropic 2402/10

Part number P/N

Narda Safety Test Solutions GmbH

Sandwiesenstrasse 7
72793 Pfullingen, Germany
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.narda-sts.de

Narda Safety Test Solutions

435 Moreland Road
Hauppauge, NY 11788, USA
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.narda-sts.com

Narda Safety Test Solutions Srl

Via Leonardo da Vinci, 21/23
20090 Segrate (Milano), Italy
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]
www.narda-sts.it

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