| 摘要 |
A noise measuring unit 24 measures a noise power based on an output from a digitizer 16 and the amplification factor of a limiter amplifier 12 when an output from a device under test 10 is supplied for the digitizer 16 through the limiter amplifier 12 . Since the output from the device under test 10 is supplied through the limiter amplifier 12 , the noise component is sufficiently amplified, the carrier component saturates, and thus, the noise measuring unit 24 easily measures the noise power. At this time, the output frequency of the device under test 10 is not multiplied, and thus, it is not necessary to use a down converter or a spectrum analyzer, the C/N ratio can be measured at a high speed or with a simple constitution.
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