RF Electromagnetic
fields frequently degrade the performance of the electronic equipment
in
automobiles by generating common mode currents on cables. The effect of
these E/H fields on the
automobiles electronic equipment can be simulated very well by injecting
common mode currents
on to the cables of the equipment. GM 3100 defines one procedure and different
test levels for
conducted immunity testing of wiring harnesses over the frequency range
of 1 – 400 MHz per
substitution method ISO 11452-4. Figure 1 shows a typical test set-up
compliant with GM 3100 and
ISO 11452-4.
developed to meet the demanding performance requirements of GM 3100. The major challenge of
GM 3100 is to deliver 1 amp to the 50••••calibration fixture between 1 and 30 MHz in the calibration
step of the test procedure. The F-120-8 offers a number of distinct overwhelming advantages.
The primary advantage of the F-120-8 is its high efficiency. Over the full bandwidth of the test,
having less than 7 dB of loss from 500 kHz – 400 MHz. More specifically, the Injection Probe has
less than 5 dB of loss over a critical portion of the bandwidth, 1 – 30 MHz, where the disturbance
signal reaches a maximum level of 1 amp for level 2 testing. While standard injection probes
require up to 7000 watts to meet the 1 amp level, the F-120-8 requires less than 220 watts at
maximum. This represents a savings in power of > 3000%!
The following tables show power required by the F-120-8 to achieve the level 1 and level 2 disturbance signals defined in GM 3100.
Frequency:
Internal Diameter:
External Diameter:
Thickness:
Input Power Rating:
40 mm
127 mm
134 mm
100 watts for 30 minutes
250 watts for 15 minutes
Accessories
FCC-BCICF-4 – Calibration Fixture
F-52 – Clamp
on Monitor Probe
10 kHz – 500 MHz, 40 mm Internal Diameter
20603 Earl Street • Torrance, CA 90503 • Tel: (310) 303-3300 • Fax: (310) 371-6268
E-mail: sales@fischercc.com
