USER MANUAL FOR VOLTAGE DIVIDER - Mechanical …电压分压器机械用户手册….docVIP

USER MANUAL FOR VOLTAGE DIVIDER TABLE OF CONTENTS 1. INTRODUCTION 4 2. THEORY AND PREDICTIONS 5 3. WIRING INSTRUCTIONS 10 4. AppArATUS 10 5. testiNG SEQUENCE 10 6. List of Parts 13 7. REFERENCES 15 LIST OF FIGURE CAPTIONS Figure 1 -- (a) Voltage divider circuit without load potentiometer, but a signal wire; (b) the voltage divider circuit with a load potentiometer. Figure 2 – Theoretical and experimental variation of output voltage, , with resistance ratio, , for =5.18V. Figure 3 -- Picture of function module in which the locations of the output voltage terminals, input voltage terminals, ground and the potentiometer are shown. LIST OF TABLE CAPTIONS Table 1 -- Wiring of Voltage Divider Table 2 -- Apparatus Needed for Testing Table 3 -- Testing Sequence of and , without a load resistance, for =5.18V. Table 4 -- List of Required Components INTRODUCTION Voltage division is a method used to change the voltage across a particular circuit through the use of resistors as the only circuit component. The voltage divider uses two resistors in series to decrease the voltage through a parallel circuit, according to the second resistor. Figure 1a shows the circuit diagram for a voltage divider in open circuit configuration. When this second resistance is equal, the voltage through the circuit should be halved. With the values of resistances different, the output voltage will differ. The input voltage, , the output voltage, , and the two variable resistances, and , are indicated. Figure 1b shows a voltage divider with a potentiometer acting as two variable resistors. This particular open circuit has many applications in which the voltage across another circuit needs to be varied. As the variable lead on the potentiometer changes the resistance of the two variable resistors change. In this manual, we will investigate the influence of resistance on this voltage divider configuration, in order to decrease potential with precision, and the relationship between the output