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3.4 LD 5550 Operation
3.4.1 Introduction
The LD 5550 (
LD
=
L
oad
D
ump Generator) is a plug-in high energy generator module designed for use with
the NSG 5500 mainframe system. It is designed primarily to meet the specification requirements for the ISO
7637 standard for pulses 5. In many cases the specification of this generator exceeds those specified in the
ISO 7637 standard.
When slotted into an NSG 5500 mainframe the LD module is fully programmable via USB or RS 232 and IEEE
488 interface. Parameters such as amplitude, pulse frequency, pulse width, are all under program control.
The LD 5550 is specified in the ISO 16750-2 (previously ISO 7637-2) standard, which defines how the pulses
are generated in relation to the vehicle battery voltage. When operating with a battery or battery simulator
connected to the NSG 5500 mainframe, the CDN 5500 battery switch module should also be mounted in the
rear of the NSG 5500 chassis. This module provides the necessary switching on and off of the battery voltage
according to the standard.
The module is designed using state of the art active pulse-shaping technology. This means repeatable perfor-
mance and maintenance free operation. It also means that test results can be repeated accurately.
The output pulses of the generator are available on two 6 mm sockets on the front of the NSG 5500 instrument.
NOTE!
The AutoStar program available from Teseq is a Windows based graphical program
which allows full control of all programmable features via an intuitive graphical
windows front panel.
Picture 3-25: LD 5550 Front panel layout
Indicates power ”ON”
Flashes when unit addressed
Lights when pulse 5 is selected
Lights when pulse 7 is selected
Indicates an error condition
Blinks when the pulse is fired