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RE测试,抓QP问题 [复制链接]

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只看楼主 倒序阅读 使用道具 0 发表于: 2011-10-20
谁有没有内部的抓QP得资料,想学习下,谢谢。
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只看该作者 1 发表于: 2011-10-21
你是哪家??
taosl

只看该作者 2 发表于: 2011-10-21
这应该很简单啊,楼主能具体解释下吗
只看该作者 3 发表于: 2011-10-21
Quasi-peak Measurements b+{r! D}~  
b+{r! D}~  
b+{r! D}~  
Quasi-peak detection is a form of detection where a signal level is weighted based on the repetition frequency of the spectral components making up the signal. That is to say; the result of a quasi-peak measurement depends on the repetition rate of the signal. Signals can be classified into two general categories based upon their repetition rate: narrowband or broadband. A narrowband signal is a signal that can be resolved by the spectrum analyzer. An example of a narrowband signal is a continuous wave (CW) signal. A CW signal is one signal at a fixed frequency. A broadband signal is a signal that cannot be resolved by the spectrum analyzer. An example of a broadband signal is a pulse signal. Peak, quasi-peak, and average detection will yield the same amplitude level for a narrowband signal. A broadband signal will yield a quasi-peak level lower than the peak level. The weighting (accounted for through specific charge and discharge time constants in the quasi-peak detector circuit), is a function of the repetition frequency of the signal being measured. The lower the repetition frequency, the lower the quasi-peak level. b+{r! D}~  
b+{r! D}~  
Many agencies governing the electromagnetic interference (EMI) from commercial products require quasi-peak detection to be used .Even if the emission from a device is over a test  limit when measured with peak detection, the device will be considered to pass if the quasi-peak level is below the test limit. b+{r! D}~  
Because of the charge and discharge time constants used in the quasi-peak detector , the spectrum analyzer must sweep considerably slower when the quasi-peak detector is on. b+{r! D}~  
Since the quasi-peak level of a signal is always equal to or less than the peak level of that signal, quasi-peak detection need be employed only when a signal is close to or over the test limit when measured with peak detection. b+{r! D}~  
For initial measurements, peak detection is used since peak detection does not require the slower sweep times b+{r! D}~  

只看该作者 4 发表于: 2017-09-19
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