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Overview
This experiment learns the knowledge points of DC bridge to measure resistance, exchange (change arm) method, multiplier selection, bridge sensitivity measurement, resistivity measurement, etc. The experimental device can complete the basic content of DC bridge experiments, enhance the content, advanced content and high-level content, to achieve hierarchical teaching.
Experimental content
1）Basic content
Self-assembled bridge, select the appropriate multiplier, measure the resistance of different unknown median) resistors, and measure the sensitivity of the bridge.
(2) Enhancement content
Consider the influence of the bridge ratio arm resistance and the sensitivity of the current detector on the sensitivity and measurement accuracy of the whole bridge, calculate the uncertainty of the unknown resistance, and write the expression of the result.
3）Advanced content
Build a double-arm DC bridge, measure the resistance of a metal bar based on the principle and measurement method of the double-arm bridge; measure its length and diameter, and calculate the resistivity of the bar.
4）High-level content
Combine with engineering technology to study the application of DC bridges, such as: temperature control, light control circuits, etc.
Combine with modern science and technology, using sensors, data acquisition, virtual technology, etc., to collect the bridge voltage into the computer, and design applications in software.
Features
1) Modular design
Independent module design, building block type assembling combination, fully mobilize students' hands-on ability.
2）Visualized appearance
The bottom of the module is made of visualized transparent material, which is convenient to observe the components.
3）Detachable structure
The module adopts detachable structure, which is convenient to replace the components.
4）Digital experiment
Micro current sensor is used instead of traditional current detector to realize hierarchical teaching.
Parts List
| No | Parts List | Number |
| 1 | Balance bridge module | 1 |
| 2 | Unbalanced bridge module | 1 |
| 3 | Resistance module to be measured | 1 |
| 4 | Low resistance measurement module | 1 |
| 5 | Alarm circuit module | 1 |
| 6 | Photoresistor probe | 1 |
| 7 | Thermistor probe | 1 |
| 8 | Switch Module | 1 |
| 9 | DC regulated power supply | 1 |
| 10 | Resistor box | 2 |
| 11 | Four-terminal Resistors | 1 |
| 12 | Standard Low Value Resistors | 1 |
| 13 | Wire | Several |
| 14 | Microcurrent sensor | 1 |
| 15 | Intelligent terminal | 1 |
Optional Accessories
Box type single or double arm bridge