Atec Teseq-Schaffner-NSG-5500 - Manual (Page 5)

Alternators produce a high-energy (load dump)
pulse on a vehicle’s power harness when the battery
is disconnected. The LD 5505 simulates the corre-
sponding pulse 5 specified by numerous standards,
and the clamped load dump pulse 5b. Some vehicle
manufacturers have expanded upon these specifica-
tions - in most cases by making them more stringent.
The generator takes this into account.
Contrary to the classic concept, the unit is built
around an active pulse shaping circuit. While still
compliant with ISO 7637-2 Annex E, this is the best
and most cost-effective method to reach the full
range of pulse requirements. For example, ISO 7637-2
requires 40 - 400ms, which the LD 5505 meets easily.
Other manufacturer may utilize older technology, take
shortcuts and do not allow the full range as required
by the standards. Schaffner’s advanced technology
also enables much greater variability of the pulse
parameters to be achieved and facilitates better re-
producibility. The RM 5505 impedance box is avail-
able, which sets up the generator impedance using a
bank of power resistors.
Technical specifications LD 5505
Pulse amplitude: 20 - 200V in 0.5V steps
Clamping: 18 - 180V
Impedance: According to resistor installed,
the optional RM 5505 has
available 0.5 - 10
Ω in 0.25Ω steps
Pulse rise time: 0.1 - 10ms
Pulse duration: 30 - 700ms in 1ms steps
Pulse repetition: 15 - 600s in 0.1s steps
Pulse modes: Single, continuous,
programmed 1 to 99,999
LD 5505
Load dump generator
The only load dump generator capable of the full range of pulses required by
most standards.