| 摘要 |
PURPOSE:To adjust the signal level of a signal transmission line digitally by arranging a resistance attenuator group on the signal transmission line and displaying the digital counter count output on a display device. CONSTITUTION:Resistance attenuator group 3 formed by plural resistance attenuators, which are set to an attenuation quantity according to the binary output of digital counter 4, is arranged between input terminal 1, where analogue signals are applied, and output terminal 2, where level-controlled analogue signals are obtained, and is connected to operation switch 6 performing the adjustment of the signal level. Pulse generator circuit 5 to generate counting pulses is connected to digital counter which outputs binary information according to count and gives it to resistance attenuator group 3 and driving circuit 7, and digital counter 4 is connected to not only resistance attenuator group 3 but also display device 8 through driving circuit 7 which converts the binary output to signals which can be displayed. |
