Specifications

EMC-CS-2009.1

February 11, 2010

Annex A (Normative): Field Calibration Procedure for ALSE Method Bands 6 and 7)

Due to the need for accurate generation of the high field strengths for Bands 6 and 7, field characterization shall be facilitated

using the procedures outlined in this annex. These procedures replace those delineated in ISO 11452-2. This

characterization procedure allows for use of either CW E-field probes or a receive antenna (DRG horn). For Bands 4 and 5,

the field characterization delineated in ISO 11452-2 shall be used. The procedure outlined in this annex shall not be used for

field characterization of Bands 4 and 5.

A.1 CW E-field Probe Method

When using this method, the orientation of the CW E-field probe axes with respect to surface of the dielectric support and the

transmit antenna are specifically defined. Figures A-1 and A-2 illustrate positioning for two common probe styles. For some

probes, special consideration must be given to assure they are oriented correctly. In Figure A-2, the probe handle must be

tilted upward with respect to the surface bench (typically 35 degrees) and rotated around the axis normal to the bench surface

(typically 135 degrees) to achieve proper alignment of the probe. Actual positioning shall be determined, based on the

probe's specifications. For either probe, its phase center (probe axis origin) is 125 mm above the surface of the dielectric

support, used during actual testing.

Calibration for vertical or horizontal polarization shall be relevant to the specific axis, not the vector resultant (e.g. E

total

Example: For vertical polarization, the field calibration shall be relative to the vertically aligned field probe sensor (i.e. Z

axis sensor). For horizontal polarization, the field calibration shall be relative to the horizontally aligned field probe sensor

(i.e. X axis sensor). Using this method requires the field probe

facilitate separate field axis readings. Field probes that

produce only a vector summation of the measured field shall not be used.

Additional requirements include:

• The phase center of the field probe is positioned 125 mm above the surface of the dielectric support used during

actual testing.

• Peak forward power shall be the reference parameter for characterization of the field. This forward power shall be

measured using either a peak envelope power (PEP) sensor (preferred method) or a spectrum analyzer.

A list of

recommended power meters/sensors may be found at http://www.fordemc.com

. If a spectrum analyzer is used, it

shall be tuned to each individual frequency using zero span setting with a measurement bandwidth greater than 3

MHz.

• Pulse modulation characteristics shall conform to that illustrated in Figure B-1 in Annex B.

• Characterization shall be performed using CW at the required field strengths in Table 11-3. Characterization at

lower field strengths with subsequent power scaling for higher field strengths is not permitted.

• The E-field probe used shall be capable of measuring electric fields listed in Table 11-3 (e.g. 300 / 600 V/m.

• The E-field probe shall be specifically calibrated the following frequencies:

o 1.3 GHz

o 2.9 GHz

A.2 Pulsed E-field Probe Method

Use of E-field probes capable of direct measurement of a pulsed fields is permissible only with prior written approval from

the FMC EMC department.. The probes shall meet the requirements delineated for CW field probes (section A.1) with the

exception that measurement of CW fields is not required. Currently the only approved commercially available pulsed E-field

probe is the Amplifier Research Model PL 7004.