Specifications

EMC-CS-2009.1

February 11, 2010

8.2 Test Verification and Test Setup

The requirements of CISPR 25 (Edition 3), voltage method shall be used for verification of the component performance

except where noted in this specification. If the DUT has separate power/power return circuits, separate tests shall be

performed on each circuit. Circuits not being tested shall be connected directly to an automotive battery. This requirement

may be waived if the multiple circuits are used only meet the operating current demands of the DUT (e.g. single power

circuit, but with multiple connector pins). Under these conditions, the all power circuits are tied to the Artificial Network.

• Electronic hardware in the Load Simulator shall be powered from an automotive battery (see paragraph 4.5.4 for

requirements). The battery negative terminal shall be connected to the ground plane.

• The power/power return wiring between the DUT and the Artificial Network shall be 200 +/-50 mm in length.

• The DUT shall be placed on an insulated support 50 mm above the ground plane. However, if the outer case of the

DUT is metal and, when installed in the vehicle is electrically connected to the vehicle's sheet metal, the DUT shall be

mounted and electrically connected to the ground plane during the test in a manner representative of the vehicle

application. This configuration is only permitted if documented in the product engineering specification and is

representative of the vehicle application. The DUT grounding configuration shall be documented in the EMC test

plan and test report.

• If the DUT’s power return is required to be locally grounded in the vehicle within 200 mm of the DUT (must be

specified in the DUT engineering specification), the DUT power return shall be connected directly to the ground plane.

Under these conditions, the Artificial Network connected to the DUT’s power return may be omitted.

8.2.1 Measurement System Requirements

The measurement receiver (spectrum analyzer or stepped receiver) shall be compliant to CISPR 16-1-1 as specified in section

4.4 of CISPR 25 3rd edition. Measurement receivers using Fast Fourier Transform (FFT) techniques may be used with prior

approval from the FMC EMC department. A list of approved measurement systems may be found at: www.fordemc.com.

Tables 7-3 and 7-4 in section 7.2.2 list the measurement system requirements when using either a swept (i.e. spectrum

analyzer) or stepped EMI receiver. Measurement system requirements are identical to those respective bands for RE 310.

.For Bands EU1 and G1, it is recommended that the measurement time (stepped receivers) be equal to

1/f, where f is the

signal repletion rate. Swept receivers need to be adjusted accordingly. Measurement times used shall be documented in the

EMC test plan.

8.3 Test Procedure

a) Prior to measurement of DUT conducted emissions, test setup ambient levels (i.e. all equipment energized except

DUT) shall be verified to be 6 db or more below the specified requirements listed in Table 8-1. Test setup ambient

levels shall be at least 6dB below the specified limits otherwise testing shall not proceed until the associated test setup

issues are resolved.

b) Measurement of DUT conducted emissions shall be performed over each frequency band listed in Table 8-1.

c) Tests shall be repeated for all DUT operating mode(s) delineated in the component EMC test plan.

d) When assessing DUT performance to Quasi-Peak limits, the use of peak detection with the same measurement

bandwidth is permitted as a quick pre-screen to increase testing efficiency. If the peak emissions are below the limit,

the test data may be submitted as the final result. If the peak emissions exceed the band requirements, it will be

necessary to re-sweep individual frequencies where the limit was exceeded using Quasi-peak detection. Peak and

quasi-peak data shall be submitted in the test report.