38
NSG 5500 Automotive transient immunity generator
Mains input power is brought into the system via the power entry module. The power entry module has a
mains input power filter socket that allows for adjustment between 110/120 VAC and 220/240 VAC operation.
This filter socket contains the two 3.15/6.3 A fuses.
220 - 240
110 -
115
1
0
The battery switch unit is an electronic solid state switch that allows flexible control of the power bus output
during the generation of interference pulses - for example pulse 1. (ref. ISO standard 7637-2).
The requirement for sophisticated switch control when generating ISO 7637 pulses is not immediately apparent.
However, upon deeper examination it will become clear that the requirement for turning “ON“ and “OFF“ the
battery power can only be met with a complicated solid state switch arrangement. This is because high power
current needs to be switched over very short periods of time and by different control mechanisms.
Take for example pulse 1 of the ISO 7637-2 specification.
Mains input connector
On / off switch
Rotate this Insert to change
voltage selection
This indicator determines voltage
selected
Picture 3-5: Power entry module of the NSG 5500 (located in the CDN 5500).
< 100 µSec
Battery “OFF“ here
Battery
“ON“ here
ISO 7637 - Pulse 1
Picture 3-6: Pulse 1 of the ISO 7637-1 specification.
