Resistor Ohm Meter

[Melanie]

There comes a point where you have to look at the problem from a different angle.

Why not connect the 'Resistance' to a precision Capacitor and measure the rate of charge? You will still need a high-impedance amplifier, but at least you're not going into territory with silly values that are likely to change drastically if someone walks into a room without breathing apparatus.

[Gusse]

Capacitor charging method sounds far better solution than current sensing of some pico ampers.

..., but at least you're not going into territory with silly values that are likely to change drastically if someone walks into a room without breathing apparatus.

Well said Melanie

BR,
-Gusse-

[mtripoli]

Head over to Cyrustek (http://www.cyrustek.com.tw/product-1.htm) and have a look at their line of IC's. I was looking at them not to long ago for a project I have going. Most of them have pretty simple serial interfaces. "Smart-Tweezers" use one of these devices.

A question: What's a "precision Capacitor"? High-impedance amplifier that doesn't need silly values?


Mike Tripoli