Automatic selection circuit for electronic circuit resistor
专利汇可以提供Automatic selection circuit for electronic circuit resistor专利检索，专利查询，专利分析的服务。并且PURPOSE: To reduce the effect of noise and to enable to use for the selection of resistors in fine signal or high frequency circuit, by connecting the output side of photo coupler of FET type to the tested circuit and driving the input side with the constant current circuit so that the selected resistor can be equal to the resistor inserted to the tested circuit.
CONSTITUTION: The output side element T of the photo coupler F of FET type consisting of the light emitting element D and photo electric conversion element T is connected in series between the soldering terminals 12 of the printed board 11 via the probe 13, and the input side element D is connected to the output terminal of the constant current circuit 14. The input terminal of the circuit 14 is connected to the measuring selected resistor groups R
1 WR
n one end of which the reference voltage 15 is given via the switches S
1 WS
n . Further, the switches S
1 WS
n are sequentially selected with the control section 17 with the output from the operation discrimination section 16 of the board 11. Then, the constant current iL from the circuit 14 is an electric signal via the elements D and T and electrically isolated from the resistor groups R
1 WR
n via the probe 13 and fed to the tested circuit to obtain the resistance value to be inserted.
COPYRIGHT: (C)1980,JPO&Japio，下面是Automatic selection circuit for electronic circuit resistor专利的具体信息内容。
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