Since the resistance of slide wire is known accurately, the voltage drop along the slide wire can be controlled by adjusting the value of working current in the basic dc potentiometer.The process of adjusting the working current so as to match the voltage drop across a portion of sliding wire against a standard reference source is known as "Standardisation". The slide wire d.c. potentiometer is the basic and simplest type of the d.c potentiometer as shown in the Fig. The long slide wire is awkward, and even for the length shown cannot be read to a very great degree of precision. In a potentiometer, the entire input voltage is applied across the whole length of the resistor, and the output voltage is the voltage drop between the fixed and sliding contact as shown below.A potentiometer has the two terminals of the input source fixed to the end of the resistor. With the protective resistance in the circuit, the potentiometer is balanced by means of the main dial and the slide wire. drop across a portion of sliding wire against a standard reference source is known as "Standardisation". The slide wire of Fig. 5. DC treadmill motor for DIY projects with v belt adapter sold on ebay. 2 shows how this slide wire potentiometer can be used to compare two unknown e.m.f’s, E 1 and E 2.The battery B, whose e.m.f. The circuit of a single potentiometer may be modified in a simple way to add a second range, which is usually by a second factor, such as 0.1 or 0.01, in order that the direct reading features of the original circuit may still be utilised. The below figure shows the schematic diagram of a, In the above figure, the total resistance of measuring of the circuit, Rm consists of resistance of the main dial in series with that of slide wire. This means that by changing the wiper position, you get a value between 0Ω and 10kΩ. Slide potentiometers are also known as slider potentiometers or fader potentiometers. This is a linear potentiometer. A standard cell of 1.0185 V is used with a slide wire potentiometer. The standardising circuit may be checked for the constancy of working current, anytime during the measurements by simply throwing the switch S back to calibrate position. The turns of the coil are bonded together by an adhesive. This completes the standardisation process for the. The combination of dial resistors and the slide wire is set to the standard cell. A centre zero type galvanometer is included in the circuit to indicate deflection. In order to standardize the a.c. potentiometer, the slide wire circuit is switched on to a d.c. supply. The potentiometer essentially has a resistive element over which a moving terminal, the wiper slides. These EMFs may be of the order of one to several microvolts and are difficult to locate and control. This process does not disturb the measuring circuit while convenience and speed of measurements are increased. The switch S is thrown to the calibrate position and the galvanometer key is tapped while the rheostat is adjusted for zero deflection on the galvanometer. The working current of the, The slide wire is provided with 200 scale divisions and since the total resistance of slide wire corresponds to a, Electrical and Electronics Measurements by S. Chand. A website for electrical engineering education on Machines,Circuits,Power Systems,Measurements,Control Systems,Power Electronics. The protective resistance is kept in the circuit in the initial stages so as to protect the galvanometer from being getting damaged. The following steps are used when making measurements with the above potentiometer: 1. 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