ISO11452-1里面说:放大器和传输器(BCI注入钳)共同覆盖的测试频段,放大器输出的谐波(要监测到5次谐波)应该比载波低12dB@1GHz以下,低6dB@1GHz以上。 那么这个谐波在什么状态下测试呢?至少要在最大测试级别下测试,而且要带上探头(或者对于11452-2来说,就是天线)一起。
ISO11452-4-2020 Test conditions
ISO11452-4-2020 Test conditions
The applicable frequency ranges of the BCI and the TWC test methods are direct functions of the transducer characteristics (current probe or tubular wave coupler). More than one type of transducer may be required.
To test automotive electronic systems, the typical applicable frequency range:
- — of the BCI test method is 100 kHz to 400 MHz,
- — of the TWC test method is 400 MHz to 3 GHz.
The users shall specify the test severity level(s) over the frequency range. Suggested test levels are included in Annex D.
Standard test conditions are given in ISO 11452-1 for the following:
- — test temperature;
- — supply voltage;
- — modulation;
- — dwell time;
- — frequency step sizes;
- — definition of test severity levels;
- — test signal quality.
ISO 11452-1-2015 Test signal quality
ISO 11452-1-2015 Test signal quality
In the frequency range limited by the bandwidth of both the amplifier and the antenna (transducer) in use, each amplifier output harmonic (up to the fifth harmonic) shall be limited to -12 dB (-6 dB for frequencies above 1 GHz) relative to the carrier wave, unless otherwise specified for a particular test
method or in the test plan.
This characteristic shall be verified at least for the maximum used test level, with the amplifier output connected to the test transducer (antenna, TEM, injection probe, etc.).
NOTE When a specific part of ISO 11452 defines multiple polarizations test, the harmonics characteristics need only be verified for one polarization.
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