| 摘要 |
PURPOSE: To make it possible to perform automatic measurement, to output the result instantly and to improve the efficiency of measurement/inspection works by reading the data from the circuits of two systems with a CPU, and performing the control and operation. CONSTITUTION: When a Sys.Noise push-button switch 13 is operated under the state wherein an optical input signal 10 is not inputted, the residual noise of a system is digitized with an A/D converter-II 9. Thus, the system residual noise Nz is obtained. Furthermore, a Graph push-button switch 14 is operated under the state wherein the signal 10 is inputted. When the switch 14 is operated, the output 2b from an A/D converter-I 4 and the output Nm from the converter-II 9 are read with a CPU 11, and Pm is obtained. Then, the output from the converter-I 4 is read with the CPU 11, and the average optical power Po is obtained. Therefore, the operation is performed with the CPU 11, and RIN=10log(Pm/Po)<2> is obtained. A display device 12 can instantly display the result of the automatic measurement on, e.g. a CRT. |
