| 摘要 |
PURPOSE:To automatically evaluate a device by comparing the level of an output signal from a device to be measured with that of a reference signal, and judging the quality of the device with reference to the result of the comparison. CONSTITUTION:An output from a test signal source 2 is applied to a device 1 to be measured, and an output from the device 1 to attenuators 4a-4n through BPF 3a-3n. A control signal generating circuit 5 is adapted to apply an instruction signal for an attenuation amount to each of the attenuators serially with respect to time in accordance with a program. As a result, the level of a required output from each of the attenuators is compared 7a-7n with that of a reference signal. When a signal representative of level agreement in output, an output representative of ''acceptable quality'' is obtained through an AND-circuit 8. Accordingly, when the pattern of a cumulative frequency spectrum is in agreement with a desired pattern thereof, the device being measured can be rated as ''acceptable''. |
