User:Jake Mokris/Hall Effect

Okay, so I'm trying to measure the Hall voltage of our tungsten sample. I am getting some strange readings. I am thinking that I need to adjust the compensation of the microvoltmeter.

So, this is what's going on: the samples are attached to a plate that you insert in the magnet. You connect all the detectors to this plate. Now, at the top of the plate, there's a knob that's supposed to adjust the resistance of the circuit that connects to the sample (this is from the manual):

"Before exposing the Hall effect apparatus to the magnetic field, adjust the zero point: Apply a transverse current I of e.g. 10 A and set the indicator of the meter for measuring the Hall voltage UH to zero using the adjusting knob. If the display changes after switching off, switch the transverse current back on and repeat the zero-point adjustment."

It turns out that this knob doesn't work.