48
NSG 5500 Automotive transient immunity generator
3.3.3 Tests with a coupling clamp
A capacitive coupling clamp is used when the bursts have to be injected into control and data lines.
The following diagram illustrates the arrangement of the test rig recommended by ISO and DIN.
Picture 3-22: Arrangement of the test rig (dimensions in millimetres).
Key
1. Insulating support if device under test is not to be connected to ground in the vehicle
2. Device under test
3. Insulating supports for the test harness
4. Peripheral items (such as sensors, load, accessories) mounted as in the vehicle
5. Ground plane
6. Power supply 12 or 24 V
7. AC power supply
8. Battery
9. Oscilloscope
10. 50 Ω attenuator
11. Coupling clamp
12. Test pulse generator
A standard-conforming coupling clamp is available from Teseq under the type number CDN 500. The clamp
has a 50 Ω BNC connector at both sides. The test circuit must be terminated with 50 Ω on the side opposite
to the generator.
In keeping with the specifications, the following relationships result during calibration measurements:
Pulse at generator output: 120 V
Pulse at 50 Ω connection: 60 V