| 摘要 |
A controllable generator 300, 3, 4 delivers a signal SNA to the display and is connected to one input of a comparator 1 whose other input receives the signal EA output from the sensor. The output SC of the comparator 1 controls the increment or decrement of a reversible counter 2 of clock pulses HA. The output with sign SA of the reversible counter 2 controls the generator 300, 3, 4. The invention applies to measuring the level of liquid in the tank of a motor vehicle for example. Rapid parasitic level variations are filtered out. <IMAGE>
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