| 摘要 |
An apparatus for determining or monitoring the fill level of a substance in a container, including a high frequency oscillator, an in/out coupling unit, an antenna, which transmits measuring signals, which are coupled in via the in/out coupling unit, in the direction of the surface of the fill substance, respectively receives the measuring signals reflected on the surface of the fill substance, and an evaluating circuit, to which the measuring signals reflected on the surface of the fill substance are supplied and which ascertains the fill level in the container via a travel-time difference method. The high frequency oscillator includes a transistor with a source branch, a drain branch and a gate branch, at least one frequency tuning component and at least one frequency determining component. The frequency determining component of the high frequency oscillator is arranged in the source branch of the transistor. |
