resolution
大信號出現非線性失真
dynamic rage
可同時檢測的範圍差
sensitivity
靈敏度，可檢測的最小訊號
為了取得最佳的顯示，vbw通常為rbw的0.1倍
RSSI Received Signal Strength Indication 是一個負的dbm，表示rf信號數值，信號要好，連線品質越好，因此rssi愈接近0愈好，rssi -60dbm 比-80dbm好
snr signal to noise ration是一個正的db，表示信號比雜訊強多少，雜訊強就有collision，就重傳，因此throughout 就底，
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