我认为这是E4440A最大混音器输入电平的限制，你可以在AMPT / NEXT / NEXT / MAX MIXER LVL（通常是-10dBm）找到它。
您应确保混频器的输入电平小于最大值，即[RF输入电平] - [Int Att]≤[Max Mixer Level]。
E4440A确保了这一优先级，因此可以自动调整参考电平。
以上来自于谷歌翻译
以下为原文
I think it is the restriction of the max mixer input level of the E4440A, you can find it at AMPT/NEXT/NEXT/MAX MIXER LVL (normally is -10dBm).
You should make sure that the input level to the mixer is less than the max value, i.e. the [RF Input Level] - [Int Att] ≤ [Max Mixer Level]. The E4440A ensures this in top priority, so the reference level may be automaticly adjusted.
我认为这是E4440A最大混音器输入电平的限制，你可以在AMPT / NEXT / NEXT / MAX MIXER LVL（通常是-10dBm）找到它。
您应确保混频器的输入电平小于最大值，即[RF输入电平] - [Int Att]≤[Max Mixer Level]。
E4440A确保了这一优先级，因此可以自动调整参考电平。
以上来自于谷歌翻译
以下为原文
I think it is the restriction of the max mixer input level of the E4440A, you can find it at AMPT/NEXT/NEXT/MAX MIXER LVL (normally is -10dBm).
You should make sure that the input level to the mixer is less than the max value, i.e. the [RF Input Level] - [Int Att] ≤ [Max Mixer Level]. The E4440A ensures this in top priority, so the reference level may be automaticly adjusted.
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