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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 406

System monitor with instrumentation-grade accuracy used to measure relative humidity

Leo Chen

Abstract

A system monitor with instrumentation-grade accuracy that can be used to measure relative humidity is described.

Keywords

Psychrometer

relative humidity

LTC2991 system monitor

Because much can be deduced about a physical system by measuring temperature, it is by far the most electronically measured physical parameter. Selecting a temperature sensor involves balancing accuracy requirements, durability, cost and compatibility with the measured medium. For instance, because of its low cost, a small-signal transistor such as the MMBT3904 is an attractive choice for high volume or disposable sensing applications. Although such ...

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