Specifications

EMC-CS-2009.1
© Copyright Ford Motor Company – All Rights Reserved Page 19 of 121
February 11, 2010
Rod Antenna Not Shown. Physical Dimensions conform to CISPR 25 3
rd
Edition Except where noted. Dimensions shown are in millimeters.
7.2.2 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 3
rd
edition. Measurement receivers using Fast Fourier Transform (FFT) techniques may be used with prior
approval from the FMC EMC department (approval will be linked to laboratory recognition) . A list of approved
measurement systems may be found at: www.fordemc.com
.
Tables 7-3, 7-4 and 7-5 list the measurement system requirements when using either a swept (i.e. spectrum analyzer) or
stepped EMI receiver.
• For all bands except, M1, M2, M3, Limit A is based on use of a 9/10 kHz measurement bandwidth combined with
either Peak or Average detection. Limit B is based on use of 120 kHz measurement bandwidth combined with Quasi-
Peak detection.
• For bands EU1 and G1, Limit A is based on use of a 0.2 – 1 kHz measurement bandwidth combined with Average
detection. Limit B is based on use of 9 kHz measurement bandwidth combined with Quasi Peak detection.
• For bands M1, M2 and M3, Limit A is based on use Average detection with 120 kHz measurement bandwidth. Limit
B is based on use Quasi Peak detection with 120 kHz measurement bandwidth.
• Measurement dwell times listed in Tables 7-3, 7-4 and 7-5 may be increased if the DUT operates with intermittent
duration, however specific rational must be documented in the EMC test plan to justify the increase.
Above 30 MHz, a low noise preamplifier is often required to meet the measurement system ambient requirements. However,
use of a preamplifier will increase the potential of overload usually from out of band signals. To minimize this potential, it is
recommended that the net gain of the pre-amplifier be selected to just meet the ambient requirements specified in section 7.3,
step a). The laboratory shall also establish a procedure to avoid overload of the preamplifier, such as using a step attenuator.
Table 7-3: RE 310 Measurement System Setup Requirements (Bands EU1, G1)
Swept Receivers Stepped Receivers
Limit A Limit B Limit A Limit B
Detection Method
Average Quasi-Peak Average Quasi-Peak
Measurement Bandwidth {MBW}
(kHz)
0.2  MBW  1 9/10
(1)
0.2  MBW  1 9
Video Bandwidth (kHz)
 3*MBW n/a
Frequency sweep rate
(sec/kHz)
(2)
MBW
03.0
≥
 0.2
Frequency Step Size (kHz)
(2)
0.5*MBW 4.5
Measurement Time per Frequency
Step (sec )
(3)
0.02 1
1. Any bandwidth in this range may be used.
2. Sweep rate calculated from MBW given in kHz.
3. Sweep rate and measurement time may be increased for low repetition rate signals. See section 7.2.2 for details