| 摘要 |
PURPOSE:To eliminate a zero point drift and not to be affected by a constant of an oscillation coil and also, to achieve a perfect interchange of an oscillator and converter, by forming an exciting electric current detection circuit in circuits and obtaining an output signal by dividing a signal electromotive force by its output. CONSTITUTION:An exciting electric current I having nearly a constant current is supplied from an exciting circuit 4 to a coil 1 of an oscillator through terminals 2, 3 and the same wavelength signal electromotive force (e) obtained between electrodes 5, 6 is sent out to a converter B through terminals 7, 8. This force (e) is sent to a division circuit 13 through a preamplifier. On the one hand, the signal proportionated to the current I is taken out from an exciting current detection resistance Rr forming an exciting current detection circuit 17 and is sent to a comparison signal reception circuit 16 through terminals 14, 15 and then, a comparison signal Vr is outputted from the circuit 16. Further, outputted signal is supplied to the circuit 13 and the signal from an amplifier for span set up 12 is divided. Then, the last output signal Io is taken out by a duty cycle/current converter 20. This current Io has no connection with the dimensions of the current I. |
