Teaching Laboratory System

The lock-in amplifier launched by Saintyear in cooperation with National Demonstration Center for Physics of Sun Yat-sen University has won the first prize of "Ten-year Construction Achievements of National Experimental Teaching Demonstration Center of Higher Education", and the first prize of 2016 National Higher Education Physics Experiment Teaching Self-made Instrumentation, etc. The center has launched the teaching-type lock-in amplifier OE1022E with the weak signal detection teaching experimental box OE5001. The teaching type lock-in amplifier OE1022E with weak signal detection teaching experiment box OE5001 launched by the center can effectively cultivate non-electronic background of physics, chemistry, biology and other students to master the modern technical means of weak signal detection, and at the same time in-depth understanding of the principle of weak signal detection. It has been carried out in a number of colleges and universities across the country to carry out experimental courses, and is widely welcomed by students.

Teaching experiment box function mainly includes: strong noise background signal extraction, tiny impedance measurement, white noise measurement, sound speed measurement, etc.. And supporting teaching video and teaching handouts. Teaching content includes: weak signal detection experiments in the background of strong noise, microvolt signal harmonic measurement experiments, tiny impedance measurement experiments, resistance thermal noise measurement experiments; bio-impedance measurements, such as human body limb resistance, skin resistance measurement experiments; chemical applications such as multi-electrode chemical impedance analyzer.

The main experimental courses include:

1. milliohm level tiny impedance measurement; can be extended to chemical impedance and biological impedance measurement experiments;

2. Noise is a thousand times or even ten thousand times the signal amplitude of the strong noise background of the signal extraction experiments;

3. varactor diode picofar level junction capacitance change relationship under different bias voltage;

4. the detection of the amplitude of each harmonic of a microvolt-level square wave;

5. Measurement of the amplitude of resistive white noise at room temperature and theoretical verification.

Block diagram of the micro impedance measurement experiment

Experimental block diagram for detecting weak signals in a strong noise background

Block diagram of a varactor diode experiment

Block diagram of the weak signal multi-harmonic measurement experiment