Specifications

EMC-CS-2009.1
© Copyright Ford Motor Company – All Rights Reserved Page 28 of 121
February 11, 2010
9.2.1 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.
Table 9-2 lists the measurement system requirements when using either a swept (i.e. spectrum analyzer) or stepped EMI
receiver.
Table 9-1: CE 421 Measurement System Setup Requirements
Swept Receivers Stepped Receivers
Detection Method
Average Average
Measurement Bandwidth {MBW}
(1)
(kHz)
0.2  MBW  1 0.2  MBW  1
Video Bandwidth (kHz)
0.1
Frequency sweep rate
(sec/kHz)
(2)
M
BW
03.0
≥
Frequency Step Size (kHz)
0.5*MBW
Dwell Time per Frequency Step (sec )
 0.02
1 Any bandwidth in this range may be used.
2 Sweep rate is calculated from MBW given in kHz.
9.3 Test Procedure
The correction factor for the Artificial Network shall be applied to all measured data (i.e. test setup ambient, DUT
conducted emissions) prior to verification the limits shown in Figure 9-1 using the equation below:
)()()( fCFfVfV
rawCE
+=
Where:
V
CE
(f) = DUT Conducted emissions (dBuV) at specific measurement frequency. V
CE
(f) is compared to the
limits shown in Table 9-1
V
RAW
(f) = Conducted emissions (dBuV) from measurement port on Artificial Network at specific
measurement frequency
CF= Correction factor (dB) for Artificial Network at specific measurement frequency
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 Figure 9-1. If ambient levels are
less than 6 db below the specified limits, testing shall not proceed until the associated test setup issues are resolved.
Plots of the test setup ambient shall be included in the test report.
b) Measurement of the DUT's power line conducted emissions shall be performed over frequency range listed in Table 9-
1.
c) Tests shall be repeated for all DUT operating mode(s) delineated in the component EMC test plan.