| 摘要 |
PURPOSE:To make it possible to shorten the measuring times of two signal characteristics of a receiver, by shifting the output level of a reference signal in a predetermined amount in operating a set switch. CONSTITUTION:When a set switch 16 is operated, the points A, B of a change- over device 15 are connected while the data of an attenuation amount to be shifted from a memory apparatus 19 is read to be transmitted to an operator 20. In this operator 20, the substraction of the data of an already inutted output level amount and the data of the shift attenuation amount from the memory appratus 19 is performed and the subtraction data is sent to a variable attenuator 11. By this method, the attenuator 11 is controlled by the attenuation amount and a reference signal is obtained in the output thereof. |
