| 摘要 |
PROBLEM TO BE SOLVED: To supply a DC voltage required for a sensor with built-in amplifier only by connecting a connector without adding a measuring resistance by a user even if an output of a sensor or an amplifier is an analogue voltage or an analogue current.SOLUTION: A digital measuring instrument is provided in which a connector having at least contacts of four electrodes for a measuring instrument is installed on an external surface, and one electrode from among the contacts of the four electrodes is connected to a ground of an AD conversion circuit installed in the measuring instrument, and the other one electrode is connected to an input side of the AD conversion circuit, and a different another one electrode is connected to the ground via the measuring resistance installed in the measuring instrument, and further another one electrode is connected to a plus side of the DC power supply installed in the measuring instrument.SELECTED DRAWING: Figure 4 |
