LEEM-24 Unbalanced Electric Bridge Design Experiment
Experiments
1. Master the working principle of unbalanced electric bridge;
2. Master the principle and method of using the output voltage of the unbalanced bridge to measure the variable resistance;
3. Use the thermistor sensor and unbalanced bridge to design a digital thermometer with a resolution of 0.1℃;
4. The principle and application of full-bridge unbalanced electric bridge, design a digital display electronic scale.
The main technical parameters
1. The transparent design of the bridge arm circuit helps students master the principle and intuitive understanding;
2. Unbalanced bridge: measuring range 10Ω～11KΩ, minimum adjustment amount 0.1Ω, accuracy: ±1%;
3. Highly stable power supply: adjustable voltage 0～2V, digital display voltage value;
4. Digital voltmeter: 3 and a half digital display, measuring range 2V;
5. Precision amplifier: adjustable zero, adjustable gain;
6. Digital temperature measuring thermometer: room temperature to 99.9℃, measuring accuracy ±0.2℃, including temperature sensor;
7. Digital thermometer design: Combining non-balanced electric bridge and using NTC thermistor to design a high-sensitivity digital thermometer of 30～50℃
8. Full-bridge unbalanced bridge: bridge arm impedance: 1000±50Ω;
9. Digital display electronic scale: design range 1KG, comprehensive error: 0.05%, a set of weights 1kg;
10. The equipment includes all the configurations needed to complete the experiment, including temperature experiment and electronic scale experiment.
