LEEM-18 AC Bridge Experiment

Short Description:

This instrument can form any kind of balanced AC bridge through free connection and matching. Through learning and verifying the measurement principle of AC bridge, design practical AC bridge to measure unknown components.

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Experiments
1. Learn and master the balance conditions and measurement principles of the AC bridge; verify the balance conditions of the AC bridge;
2. Measure capacitance and dielectric loss; self-inductance and its coil quality factor and mutual inductance and other electrical parameters.
3. Design various AC bridges for actual measurement.

The main technical parameters
1. Built-in power signal source: frequency 1kHz±10Hz, output voltage amplitude: 1.5Vrms;
2. Built-in digital display AC voltmeter: AC voltage measurement range: 0～2V, three and a half digital display;
3. Built-in four-digit LED digital frequency meter, measuring range: 20Hz～10kHz, measuring error: 0.2%;
4. Built-in AC zero-pointer: with overload protection, no meter head; sensitivity ≤1×10-8A/div, continuously adjustable;
5. Built-in bridge arm resistance:
Ra: consists of seven AC resistances of 1, 10, 100, 1k, 10k, 100k, 1MΩ, with an accuracy of 0.2%
Rb: Composed of a 10×(1000+100+10+1+0.1)Ω AC resistance box, with an accuracy of 0.2%
Rn: Composed of a 10K+10×(1000+100+10+1)Ω AC resistance box, with an accuracy of 0.2%
6. Built-in standard capacitor Cn, standard inductance Ln;
Standard capacitance: 0.001μF, 0.01μF, 0.1μF, accuracy 1%;
Standard inductance: 1mH, 10mH, 100mH, accuracy 1.5%;
7. The measured resistance Rx, capacitance CX and inductance LX with different values and performances are included.