| 摘要 |
PURPOSE:To obtain a load cell balance that is fast in measurement and has weight indication which does not flash light by selecting automatically the strength of prevention process in accordance to the existence and non-existence of outside noises. CONSTITUTION:An outside noise sensing circuit 15 is provided with a gate 18 that is connected to an antenna 17 through a capacitor 16. On the input side of the gate 18 a resistor R1 19 and R2 20 are connected to establish near the threshhold voltage an input voltage based on the supply voltage Vp. If there is no outside noise, the output of a load cell 1 is arithmetically processed to display the results on a display 7. Prevention of flashing of light in the display is simple and measurement speed is high. If it is feared that an A/D converter 4 and others may mis operate due to outside electro-magnetic waves and other outside large noises, the Vout of the gate 18 becomes a high voltage and output signal CPU 9 is given to make offering. Accordingly flashing of light due to outside noises is prevented. |
