| 摘要 |
<p>This invention aims to precisely determine a value of noise factor (NF) of a receiver. A noise factor deriving apparatus (60) comprises first and second NF deriving parts (62, 64). The first NF deriving part (62) derives a first noise factor, which is a noise factor occurring when a given receiver-side pin (pin 1R) is connected to a receiver (116), based on both a ratio (Y) of the powers of two types of reference noises measured by the receiver (116) and an excessive noise ratio of a reference noise source (22) when the receiver (116) receives, as input signals via the receiver-side pin (pin 1R) of the given receiver, the two types of reference noises of different levels which are outputted by the reference noise source (22) and the excessive noise ratio of which is already known. The second NF deriving part (64) derives, based on both a measuring-device-side inter-terminal difference and the first noise factor, a second noise factor that is a noise factor occurring when receiver-side pins (pin 2R, pin 3R, pin 4R) are connected to the receiver (116). The measuring-device-side inter-terminal difference is a difference between the first and second noise factors.</p> |
