Convinced of the need to use adjustable potentiometer friends will want to know the double potentiometer correct measurement method, today, up to a common Electronic 100K, 3 feet adjustable rotary potentiometer for example:
　　Adjustable potentiometer two fixed end as A, B, intermediate slider is C, then:
　　1, measuring the resistance between A-B, should 100K;
　　2, measured between the A-C, resistance between B-C, the two resistance value and should be 100K (or substantially equal);
　　3, rotation of the adjustment process at any location shall meet the conditions 2;
　　4, the knob counterclockwise adjusted to 0, then the resistance between the B-C is "0", the resistance between the A-C is "100K";
　　5, fixed access measuring points B, C, knob from "0" point gradually adjusted to the maximum resistance value, the B-C should change between the knob position (angle) was the same proportional change;
　　6, if it is a special potentiometer (logarithmic) is "proportional" relationship condition 5 should be "log."
　　7, it is customary, the three point B should correspond to the circuit signal "0" level, A corresponds to the "max" (signal input), C is the output signal conditioning. A, B can be reversed, but adjust the opposite habit.
　　First determine your "idiom";
　　If the "counter-clockwise" to decrease, "Clockwise" is increased, the first counter-clockwise adjusted to 0, find the "resistance" of 0 to 2 points, the rest is A;
　　A knob to any intermediate position measuring point A and the other two points of resistance, resistance to maintain 100K unchanged, the point is B.
　　In fact, is based on the relationship Rab = Rac + Rbc determined C.
　　Between the two took a larger input.
　　Adjustable potentiometer measuring method of the above explanation to understand it? You can use under actual operating Oh!