Specifications

EMC-CS-2009.1
© Copyright Ford Motor Company – All Rights Reserved Page 67 of 121
February 11, 2010
18.0 Immunity to Ground Voltage Offset: CI 250
Components shall be immune from AC ground offset voltages. Requirements include both continuous and transient
disturbances.
These requirements are applicable to the following component categories:
Electronic Modules: A, AM, AX, AY
Electronic Controlled Electric Motors: EM
18.1 Requirements
Component functional performance shall meet the acceptance criteria delineated in Table 18-1. CI 250 requirements for
continuous disturbances are delineated in Figure 18-1. CI 250 requirements for transient disturbances are delineated in
Figures 18-2 through 18-4. Transient disturbances consist of a damped sinusoidal pulse with a resonant frequency of
100 kHz. The pulse is applied using the delay sequence illustrated in Figure 18-4. Delay times for the four sequences are
listed in Table 18-2.
Table 18-1: CI 250 Acceptance Criteria (Continuous and Transient Disturbances)
Functional Acceptance Criteria
Class A Class B Class C
I I I
Figure 18-1: CI 250 Requirements (Continuous Disturbances)
0.0
0.2
0.4
0.6
0.8
1.0
1.2
110100
kHz
U
S
(V
P-P
)
Frequency Range (kHz)
U
S
( V
P-P
)
2 – 10
⎟
⎠
⎞
⎜
⎝
⎛
+
10
log14.10.1
f
10 – 100 1.0
f = frequency in kHz