| 摘要 |
Determining the value of resistance directly, but inversely, based on conductance measurements, rather than directly, based on resistance measurements, is disclosed. A voltage drop of one polarity across a referenced resistance controls the charge rate of the capacitor of an integrator of a dual slope analog-to-digital converter for a known period of time. Thereafter the capacitor is discharged to a predetermined level (e.g., zero) for a measured period of time at a rate determined by a voltage drop of opposite polarity across an unknown resistance. The measured period of time is directly related to the conductance value of the unknown resistance and inversely related to the resistance value. The time measurement is stored in latches, which control a digital display.
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