To select an optional function from plurality of function with a simple switching circuit by incorporating the functions including those of resistant signal generation, resistant signal measuring, a voltage signal generation and voltage signal measuring in one device with a small number of circuit elements.
A resistance measuring current I added from a resistance measuring equipment to be calibrated is converted into a voltage V1 by a current- voltage conversion circuit 1 and inputted to a D-A converter 2. Here, assuming that a conversion coefficient set in the D-A converter 2 is K, an output voltage V0 between terminals T1 and T2 is V0=K.I.R. Because of Reg=V0 and I=K.R, optional equivalent resistance Reg is obtained between the terminals T1 and T2. By setting the conversion coefficient K of the D-A converter 2 by a microprocessor so as to generate equivalent resistance for a measuring temperature resistor in such resistance generation mode, a function as a measuring temperature resistor simulator is provided.
JPH02269922 | TEMPERATURE SENSOR CIRCUIT |
JPS59200600 | FITTING METHOD OF CERAMIC BUZZER |
JPS57184961 | DETECTING DEVICE |
YAMAMOTO TADASHI
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