| 摘要 |
<p>PURPOSE:To supply a high-precision testing voltage by attenuating a control input to a value equivalent to the voltage variation, and synthesizing the result with an output reference voltage and outputting the synthesized voltage. CONSTITUTION:A control input code from a microcomputer, etc., is supplied to a D/A converter 1, whose conversion output is compressed by a resistance attenuator 2 and supplied to the minus terminal of an operational amplifier 3, which is synthesized with the output reference voltage supplied to its plus terminal and outputs the synthesized voltage. An attenuator 2 compresses the output full- scale voltage of the converter 1 to the value corresponding to voltage variation required for final output. Consequently, the center value of the output reference voltage of the amplifier 3 is set with high precision.</p> |
