Car Electronics immunity test system

SKS-3750-P5b

P5 pulse profile:
P5 pulse called unload pulse, pulse occurs in the discharge of the battery is released moments (this may be due to the corrosion of the cable, bad wiring or engine operation caused by the internal wiring is released), but this time the alternator the battery is being charged, while the other is still connected to the load on the alternator circuit.

Uninstall pulse amplitude depends on the alternator speed, and release the battery alternator excitation instant case. Duration of the pulses depends on the time constant of unloading the field circuit, and the amplitude of the pulse. 
P5 pulses have P5a and P5b two kinds of speaking in front of the formation process is P5a pulse. However, in most of the new alternator, unload pulse amplitude is through additional suppression diode limiter (clamping), which will form the P5b pulses. Thus, the difference P5a P5b pulse pulse and that is without a limiter diode clamp pulse, the other is through the clamp pulse after. P5 pulse amplitude is higher (100 ~ 200V, with respect to the system power supply voltage, it is considered a high-voltage), the width is large (up to several hundred ms), and very low internal resistance (a few Ω, even a few tenths of Ω ). So in ISO7637-2 standard, P5 pulse belong relatively large pulse energy, in addition to the equipment under test in the assessment of the role of P5 jamming capabilities, to a certain extent it is also destructive examination equipment components. 

Technical Parameters: