| 摘要 |
FIELD: instrument making.SUBSTANCE: invention relates to a detector. Measuring apparatus for sensing metal articles, comprises a transmission coil for producing a magnetic field, two reception coils, which are oriented relative to one another, and electrically connected to one another, in region of magnetic field such that a resulting received voltage on reception coils is zero when magnetic field acts on both reception coils in same way, a control device for supplying transmission coil with an alternating transmission voltage, and a determination device for determining metal article on basis of received voltage. Control device is set up to control RMS value for transmission voltage such that received voltage remains below a predetermined threshold value.EFFECT: simplified adjustment of sensitivity.8 cl, 8 dwg |
