Electrotechnics Theory, Electric Traction,Digital & Analog Circuit Trainer

• This trainer provides a comprehensive platform for multilevel skills training, which covers teaching courses of 'Fundamental Theory of Electrical Engineering' and 'Electrotechnics', 'Digital Circuit', 'Analog Circuit', 'Electromechanics', 'Motor and Electric Traction', 'Motor Control', 'Relay Touch control' ,etc.
• Users can select different configurations to achieve multiple level training, there are four levels in total.
• The hanging type experimental panels are all painted with schematic diagram and symbol on front and welded with related components and parts on the other side. Locking type connectors are adopted for these parts that need to be measured or observed. The experimental circuit is unit circuit mode designed, each unit circuit is based on basic circuit, by connecting different elements or combining different circuits, user can practice various training contents on this trainer.
• The frame structure is made of 1.2mm thickness aluminum alloy, coming with circular arc transition interface and trapezoid design. The metal surface is acid cleaned, phosphate treated and epoxy resin powder coated, which is heat/erosion resisting.
• The table top adopts high-density fire-proof plate and the table bottom is equipped with movable and lockable truckles for easy movement.
• The experimental instruments are all digital display, with the characteristic of high accuracy. The power and instruments adopted for this trainer are set with reliable personal safety protection system.

(1) Use of basic electrical instruments and calculation of measurement errors
(2) The method of reducing the measurement error of the instrument
(3) Instrument (voltmeter, ammeter) range expansion experiment
(4) Mapping of volt-ampere characteristics of linear and nonlinear circuit components
(5) Measurement of potential and voltage and drawing of circuit potential diagram
(6) Kirchhoff's Law Verification and Fault Judgment
(7) Superposition principle verification and fault judgment
(8) Equivalent transformation of voltage source and current source
(9) Verification of Thevenin's Theorem
(10) Norton's theorem verification
(11) Measurement of maximum power transmission conditions
(12) Two-port network experiment
(13) Reciprocity Theorem Experiment
(14) Experimental study of controlled sources
(15) Observation and measurement of typical electrical signals
(16) Response test of RC first-order circuit
(17) Research on second-order dynamic circuit response
(18) Measurement of impedance characteristics of R, L and C elements
(19) RC series and parallel frequency selection network characteristic test
(20) Research on R, L, C series resonant circuit
(21) RC double T frequency selection network
(22) Observation of circuit state traces
(23) R, L, C element characteristics and AC parameter determination
(24) Using the three-meter method to measure the equivalent parameters of the AC circuit
(25) Research on phasor of sinusoidal steady-state AC circuit
(26) Mutual inductance experiment
(27) Testing of single-phase iron core transformer characteristics
(28) Measurement of three-phase AC circuit voltage and current
(29) Measurement of three-phase circuit power
(30) Calibration of single-phase watt-hour meter
(31) Measurement of power factor and phase sequence
(32) Negative impedance converter and its application
(33) Rotator and its application

1. The use of commonly used electronic instruments
2. Simple test of diode
3. Experiment of input and output characteristics of transistors
4. Single-stage amplifier circuit
5. Two-stage amplifier circuit
6. Negative feedback amplifier circuit
7. Emitter Follower
8. Differential amplifier circuit
9. Field effect tube amplifier
10. RC sine wave oscillator circuit
11. LC oscillator and frequency selective amplifier
12. Basic parameter test of integrated operational amplifier
13. Integrated operational amplifier proportional summation circuit
14. Integral and differential circuits of integrated operational amplifiers
15. Voltage comparator circuit with integrated operational amplifier
16. Waveform generator
17. Active filter
18. Integrated power amplifier
19. Complementary symmetrical power amplifier
20. Integrated voltage regulator
21. Series voltage regulator circuit
22. Thyristor controllable rectifier circuit

1. Transistor switching characteristics, limiters and clamps
2. Logic function and parameter test of TTL integrated logic gate
3. Logic function and parameter test of CMOS integrated logic gate
4. Connection and driving of integrated logic circuits
5. Design and testing of combinational logic circuits
6. Decoder and its application
7. Data selectors and their applications
8. Triggers and their applications
9. Counter and its application
10. Shift registers and their applications
11. Pulse distributor and its application
12. Use gate circuit to generate pulse signal - self-excited multivibrator
13. Monostable trigger and Schmitt trigger - pulse delay and waveform shaping circuit
14. 555 time base circuit and its application
15. Electronic stopwatch
16. Electronic password lock
17. Digital frequency meter
18. Quiz answering device
19. D/A, A/D converter

1. Contactor jog control circuit
2. Contactor self-locking control circuit
3. jog control and self-locking control circuit
4. contactor interlock forward and reverse control circuit
5. Button interlocking forward and reverse control circuit
6. Double interlocking forward and reverse control circuit of button and contactor
7. Start sequence control circuit (1)
8. Start sequence control circuit (2)
9. stop sequence control circuit
10. two control lines
11. Manual contactor control series resistance step-down starting circuit
12. time relay control series resistance step-down start circuit
13. contactor control Y-△ step-down start control circuit
14. time relay control Y-△ step-down start control circuit
15. Control circuit for energy consumption braking of asynchronous motor
16. electrical control of C620 lathe

Wenzhou Bell Teaching lnstrument Co., Ltd.is one of the members of ChinaTeaching Equipment Industry Association.Our company covers an area of 10000square meters in Qiaoxia industry zone with elegant environment and convenienttransportation. We have standard factory, spacious bright workshop, exquisite production technology. We have dedicated to the teaching instrument in researchingand promotion since 1986.We bring in the foreign technology and talented manager in order to adapt to the modernizotion of education development in 1996. The number of our company staff is 130 including 56 technicists. Our company'sfixed assets is 85 million and the working capital 120 million with annual sales 380million.Our company is actively pursuing ISo9001 to the products and the scienceand the technology department use the CAD,MlS and Cls. Our manufacting basehas standard workshop with automatic pipeline producing equipment from German, Japan and inland and well-trained stoff.Quality is regard as the lifethroughout our company. We win the satisfaction and trust from customers byimplementing the CS service program. Our company persists in the tenet of "Quality First and Client Supreme". We buildup a professional ofter-sales service team and mechanism.Our company obedience to the principle of "Inspiring new idea,Creating new century" in order tomeet the progress of society. Credibility is the base. Our company will contributeour share to the educational business with strong researching ability, excellentservice and products and high-quality staff.