| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid reduction of measurement range of parameters such as a resistance value while reducing the power source voltage. <P>SOLUTION: The measurement device includes an intermediate voltage generating section 6, a constant current supply section 7, and a processing section 14. The intermediate voltage generating section 6 generates a first intermediate voltage Vf1(=Vcc/2) which is an intermediate voltage of a battery voltage Vcc and outputs the voltage to a common terminal 4 in a voltage measurement mode, and generates a second intermediate voltage Vf2 lower than the first intermediate voltage Vf1 and outputs the voltage to the common terminal 4 in a resistance measurement mode. The constant current supply section 7 is connected to a voltage measurement terminal 2 and supplies a direct constant current I1 to a measurement object 21 connected between the voltage measurement terminal 2 and the common terminal 4 in a resistance measurement mode. The processing section 14 measures an inter-terminal voltage between the voltage measurement terminal 2 and the common terminal 4 as a measurement object voltage V in a voltage measurement mode, and calculates a resistance value Rob based on the voltage value of the inter-terminal voltage and the current value of the direct constant current I1 in a resistance measurement mode. <P>COPYRIGHT: (C)2012,JPO&INPIT |
