| 摘要 |
PURPOSE:To reduce the cost of the titled therometer by providing an initial logic adjusting circuit which corrects variance in the ratio of the resistance value of a thermistor at the temperature during initial adjustment and the resistance value of a reference resistance by varying a gate setting. CONSTITUTION:Resistance value-frequency conversion is performed by the reference resistance 102 as many times as set and then resistance value- frequency conversion is performed by the thermistor 101 within the time when the same time with conversion is generated by a frequency dividing circuit 5 which generates the same resistance value-frequency conversion time of the reference resistance 102 and the thermistor 101 by using the clock of an oscillation circuit 4. Then, the counted value of the conversion of the thermistor 101 is latched by a latch 12, decoded by a decoder 13, and displayed on an LCD14. Then, an N count number is equalized to a set number by the initial logic adjusting circuit 3 which correct the reference resistance and resistance value of the thermistor 101 so a specific expression is satisfied according to the reference resistance 102 and the count number and resistance value of the thermistor 101. |
