Specifications

EMC-CS-2009.1
© Copyright Ford Motor Company – All Rights Reserved Page 102 of 121
February 11, 2010
Figure D-4: CI 220 Pulse A2-2 Pulse Characteristics
-250
-200
-150
-100
-50
0
50
100
150
200
-150 -100 -50 0 50 100 150
usec
Volts
Contact Break
Contact Make
b) Contact Bounce (Voltage)
-300
-250
-200
-150
-100
-50
0
50
100
150
200
-1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0
msec
Volts
a) Contact Break
-250
-200
-150
-100
-50
0
50
100
150
200
-150 -100 -50 0 50 100 150
usec
Volts
Contact Make
5
10
15
20
0
-5
-20
-10
-30
-40
Amperes
c) Contact Bounce (Current)
Test Pulse C
represents the voltage transient produced as a result of switch contact arching and contact bounce during
switching of an inductive load. The transient characteristics are a function of the series wiring inductance and the current
produced during arcing (switch contact break) or contact bounce. Pulse C is directly related to Pulse A2. Given this
dependency, two separated conditions exist (Pulse C-1, C-2) corresponding to Pulses A2-1 and A2-2 respectively.
Pulse C-1 characteristics are illustrated in D-5b. The characteristics of this transient consist of a high frequency damped
sinusoidal pulse (f
res
~ 10 MHz) with peak positive and negative voltages levels approximately ±150 volts. Duration of the
sinusoidal transient pulse is varies between 100 nsec to 1 usec.
Pulse C-2 characteristics are illustrated in D-5d. The characteristics of this transient consist of a lower frequency damped
sinusoidal pulse (f
res
~ 180 kHz) with peak positive and negative voltages levels approximately ±150 volts. Duration of the
sinusoidal transient pulse is approximately 50 usec.