| 摘要 |
PURPOSE:To display the state of a receiving instrument on a field indicator by varying a source voltage according to the detection signal of the zero- adjustment point of the receiving instrument. CONSTITUTION:When the control part of a field transmitter 1 is operated, the zero adjustment of the transmitter 1 is made. This adjustment state is detected by a receiving instrument 3 through a transmission line 2 and when the zero adjustment enters the best state, the switch 6b of a voltage varying means 6 is turned ON. Consequently, the source voltage supplied to the transmission line 2 rises and its variation is detected by the field indicator 7. This variation is decoded by a display controller 74, the display state of a display part 75 is changed, and the completion of the zero adjustment is displayed. |
