18
NSG 5500 Automotive transient immunity generator
2.6 Installation / set-up FT 5531
Check the instrument for any mechanical damage. Report any damage found to the carrier immediately.
Ensure that the power is turned off on the NSG 5500 mainframe and that the battery input is disconnected.
Insert the cassette in the second slot from left and push in fully. Screw in the four retaining screws fully.
Turn on the mains input power on the NSG 5500 mainframe. After approximately a two second delay the power
LED (red) on the FT 5531 generator should light.
Now the scope calibration setup shown in picture 2-7 should be connected and the output pulses should be
quickly checked to ensure that they are of the correct form and shape. When pulses are generated the green
LED (3a or 3b, whichever is selected) flashes as pulses are output.
2.6.1 Test set-up
The following set-up can be used to check the integrity of the output pulses. Due to the high frequency nature
of the 3a and 3b pulses it is critically important that cable lengths are kept to a minimum and that the test
set-up is rigorously adhered to.
The attenuator used in this test set-up is a series combination of two attenuators. The oscilloscope used needs
to a have a high sampling rate and bandwidth. Refer to ISO 7637-2 for details.
FT 5531
output
Ground plane
Scope
20 dB
20 dB
Attenuators
50 Ohm coax
Cable (<50 cm)
Picture 2–7: Test set-up with the FT 5531 and scope.
NOTE!
The FT 5530 and FT 5531 are functionally identical and may be used interchargeably
in this guide. Differences are noted where necessary