Hi,
In the Whetstone bridge circuit:
If the circuit is balanced (and all resistances known), and we measure Vg as a function of time, then the fluctuations correspond to
4KbTR
the well-known thermal fluctuations. My question:1.what should be used for R here? 2.And if the Rx is function as a resistance temperature detector, its temperature is different from the three other dummy resistor, then what should be used for T here?
We can directly measure a resistance using the votlage divider circuit and a dummy resistor. 3. I wonder which method has a low noise level?
In the Whetstone bridge circuit:
![WYw3q.png](/forums/proxy.php?image=http%3A%2F%2Fi.stack.imgur.com%2FWYw3q.png&hash=ab278ba2678311b9e7a4cad2285f626b)
If the circuit is balanced (and all resistances known), and we measure Vg as a function of time, then the fluctuations correspond to
4KbTR
the well-known thermal fluctuations. My question:1.what should be used for R here? 2.And if the Rx is function as a resistance temperature detector, its temperature is different from the three other dummy resistor, then what should be used for T here?
We can directly measure a resistance using the votlage divider circuit and a dummy resistor. 3. I wonder which method has a low noise level?