3.1 Definitions of the following terms are specified in CISPR 16-2-1 or CISPR 16-2-2:
Reference ground: 参考地
Equipment under test (EUT):受试设备,既被测样品
Level:可以理解为等级或者水平。
Weighting:权重。
click
a disturbance, the amplitude of which exceeds the quasi-peak limit of continuous disturbance,the duration of which is not longer than 200 ms and which is separated from a subsequent disturbance by at least 200 ms. The durations are determined from the signal which exceeds the i.f. reference level of the measuring receiver A click may contain a number of impulses; in which case the relevant time is that from the beginning of the first to the end of the last impulse.
NOTE Under certain conditions, some kinds of disturbances are exempted from this definition (see 4.2.3)
喀呖声-click
一种骚扰,幅度超过连续骚扰准峰值的限值,持续时间不大于200ms,而且后一个骚扰离前一个骚扰至少200ms。持续时间由超过测量接收机中频参考电平的信号确定。
一个喀呖声可能包含许多脉冲;在这种情况下,相关时间是从第一个脉冲开始到最后一个脉冲结束的时间。
注:在一定条件下,某些类型的骚扰不包括在此定义内(见4.2.3)。
3.3 i.f. reference level
the corresponding value on the intermediate frequency output of the measuring receiver of an
unmodulated sinusoidal signal which produces a quasi-peak indication equal to the limit for
continuous disturbance.
产生的准峰值指示值等于连续骚扰限值的未调制正弦信号在测量接收机的中频输出端产生的相应值。
首先来解释下:我理解的中频的意义。在CISPR16-1-1 4.2的table1 中,frequency band 分为A/B/C/D四个频带。
band A:9kHz-150kHz
bandB:150kHz-30MHz
bandC:30MHz-300MHz
bandD: 300MHz-1000MHz。
对于准峰值测量接收机的基频特性,四个频带中-6dB的带宽分别是0.2kHz(A),9kHZ(B), 120kHz(C 和D)
因此中频的我们就可以简单理解为中心频点。对于Band A来说,如果以9kHz为起点。则中频点依次为9.2k,9.4k.....同理对与band B,C,D我们只要加上-6dB的带宽就可以得到下一个中心频点。
以上是中频的理解。