Shanghai Daiyu Education Equipment Manufacturing Co., Ltd.
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The experimental bench has relatively complete safety protection measures and relatively complete functions. The center of the experimental table is equipped with a universal circuit board. The circuit board is made of injection molding. The surface is porous and forms a set of interconnected jacks. The component boxes can be inserted into the experimental circuit at will. The box body and lid adopt a more scientific clamping structure, which is convenient for m*ntenance and disassembly. The components are placed in the left and right cabinets under the experimental table, which greatly improves the management level and planning level, and greatly reduces the teacher's experimental preparation work.
2. Experimental bench and operating table structure:
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1. Experimental bench shell size: 123×35×20cm 2. Three phase fuse 3. Three-phase power input indicators 4. M*n switch: m*n switch of the power supply of the experimental bench, with leakage and overload protection 5. Test button: Test the leakage function of the leakage switch 6． Power input indicator 1 7. 3 power output indicators (red, green and yellow) 8. AC voltmeter: Indicates output line voltage 9. Voltage conversion switch: Used in conjunction with a voltmeter to monitor the size and symmetry of the output line voltage 10. 5 terminal blocks: unit A three-phase four-wire and ground wire output 11. Ammeter W phase current output indication 12. O/I switch: three-phase four-wire power output control (Improve safety factor) 13. 2 terminal blocks: Unit B AC low-voltage power output 14． Electric meter (2A): Unit B AC current indication 15. Knob: Unit B 3-24V AC low voltage selection output 16. Switch: C unit dual-channel DC regulated power supply switch 17. Knob: C unit dual-channel I channel steady flow adjustment 18. Knob: C unit dual-channel II channel steady flow adjustment 19. 2 terminal blocks: Unit C Ⅰ DC regulated output 20． Insurance holder: C unit dual-channel regulated power supply fuse twenty one. 4 electric meters: dual-channel regulated power supply voltage and current indication twenty two. Terminal block: D unit DC 5V regulated output twenty three. Electric meter: D unit current 0.5V output indication twenty four. Switch 1: Controls various low-voltage alternating current and signal sources 25. Switch 2: Control the AC and DC voltage-regulated power supply of unit E 26. Electric meter: E unit AC voltage output indication 27. 4 terminal blocks: E unit AC and DC output ports |
28. Knob: E unit 0~240V voltage adjustment 29． Socket: G unit 220V output socket 30. Knob: Audio power amplifier volume adjustment 31. 2 terminal blocks: audio signal input 32. Button: Single pulse enable switch 33. 3 terminal blocks: single pulse output port 34. Electric meter: function generator sine wave output voltage indication 35. Knob: coarse adjustment of three-level attenuation amplitude of sine wave output 36. Knob: Sine wave output port 37. Terminal block: sine wave output port 38. Knob: Rectangular wave output amplitude adjustment 39． Terminal block: triangle wave output port 40. Knob: Function signal generator frequency fine adjustment 41. Terminal block: rectangular wave output port 42. Knob: Function signal generator five-level frequency coarse adjustment 43. Electric meter: function generator output frequency indication 44． Multimeter: MF47 type 45. Intelligent AC circuit measuring ammeter: It can measure circuit I, U, KW, Kwh, T at the same time through switch switching, eight-digit LCD display. 46. Experimental desktop size: 160×70cm 47． Universal circuit board: specification 35×90cm, component boxes can be assembled and inserted on it for experiments 48． Storage board: Place component boxes 49. Left storage cabinet: place storage board (with door lock) 50. Drawer: place commonly used tools 51． Right storage cabinet: place storage board (with door lock) |
3. M*n technical indicators of the experimental bench:
1. Input working power: three-phase four-wire
2. Output power and signal
Unit A: three-phase four-wire
Unit B: AC 3, 6, 9, 12, 15, 18, 24V
Unit C: Dual-channel constant-current regulated power supply (with overload and short-circuit protection functions), both output voltages are 0~30V, built-in relay automatically shifts gears, and is continuously adjusted by a multi-turn potentiometer. It is easy to use and outputs the maximum current. It is 2A and has preset current limiting protection function.
Voltage stability: <10-2 Load stability: <10-2 Ripple voltage: <5mv
Unit D: DC regulated voltage 5V, current 0.5A
Unit E: AC and DC voltage continuously adjustable from 0 to 240V, current 2A
Unit F: 220V voltage output for external instruments.
3. Single pulse source: a p*r of positive and negative pulses can be output each time
4. Function signal generator (sine wave, triangle wave, rectangular wave)
① Frequency range: 5HZ-550KHZ is divided into five frequency bands
② Frequency indication: read directly from the HZ meter
③Voltage output range: sine wave: 5HZ-250KHZ>4.5V, 250KHZ-550KHZ>3.5V
Three levels of attenuation: 0db, 20db, 40db with continuous fine adjustment
Rectangular wave: 5HZ-250KHZ>4.5V, 250KHZ-550KHZ>3.5V, the amplitude is continuously adjustable
Triangular wave: 5HZ-550KHZ>1V
5. Audio power amplifier: The input audio voltage is not less than 10mv, the output power is not less than 1W, the volume is adjustable, and there is a speaker inside, which is used for amplifier circuit amplification and can also be used as a signal tracing instrument.
6. Intelligent multi-functional AC measuring meter: with an accuracy of level 1.0, it can simultaneously measure the circuit current I, voltage U, power Kw, electric energy Kwh and working time T. It has an eight-digit LCD display.
7. Insulation resistance: >5MΩ
8. Leakage protection: leakage action current ≤30mA
4. Structure and equipment
1. Experimental table: Student experimental table, one table with two seats, table dimensions: 160×70×80cm. A porous circuit board is placed in the center of the table, and component boxes can be randomly inserted on it according to the experimental circuit to form an experimental circuit. Each desk is equipped with a rubber plate to protect the general circuit board and desktop (if you need to place a motor on the desktop for welding, etc.). The lower part of the table is a component storage cabinet where experimental components are placed.
2. Equipment and equipment:
Three-phase motors, time relays, thermal relays, AC contactors, AC and DC ammeters, MF-47 multimeters, wire strippers, needle nose pliers, screwdrivers and other tools, resistors, potentiometers, inductors, capacitors, transformers required for experiments, Bar magnets and other component unit boxes (the components are already installed in the unit box).
5. Experimental projects
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1. Use of electrical measuring instruments 2. Identification and detection of commonly used components 3. Volt-ampere characteristics of linear components and nonlinear components 4. External characteristics of power supply 5. Measurement of potential value and voltage value 6． Range extension for ammeters and voltmeters 7. Verification of Kirchhoff's Laws 8. Verification of Lenz's Law 9. Verification of the superposition principle and reciprocity theorem 10. Verification of Thevenin's Theorem and Norton's Theorem 11. Equivalent transformation of voltage source and current source 12. Research on controlled source characteristics 13. First order circuit experiment 14． Transition process of second-order circuit 15. Study the characteristics of LC components in DC and AC circuits 16. Conditions for the load to obt*n maximum power |
17. Measurement of AC circuit parameters 18. Characteristics of RLC components in sinusoidal AC circuits 19. RL and RC series circuit experiment 20． RLC series resonant circuit twenty one. Fluorescent lamp circuit connection and power factor improvement twenty two. Star and delta connection of three-phase load twenty three. Three-phase circuit and power measurement twenty four. Research on RC Frequency Selective Network 25. Two-port network research 26. Single phase transformer experiment 27. Mutual inductance circuit experiment 28. Use and starting of three-phase asynchronous motor 29． Basic circuit of three-phase motor relay contact control 30. Three-phase motor Y-△ starting control experiment 31. Sequential control experiment of three-phase motor 32. Three-phase motor energy consumption braking control experiment |
The following circuit experiments can also be completed using the components of the above 32 experiments.
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33. The simplest circuit 34. Selection of potentials and reference points at each point in the circuit 35. series connection of resistors 36. Resistors in parallel 37. Mixed connection of resistors 38. resistor divider circuit 39． Ohm's law for the whole circuit 40. Bridge application and balancing conditions 41. node voltage method 42. loop voltage method 43. branch current method 44． RCL parallel circuit 45. series circuit 46. Transformer structure and working principle 47． Kirchhoff's first law 48． Kirchhoff's second law 49. Fluorescent lamp circuit principle 50. Expand the voltmeter range 51． Expand ammeter range 52. Transition process of RC circuit 53． RL transition process 54. series circuit of capacitors 55. capacitor parallel circuit |
56. Capacitor charging and discharging 57． The role of capacitors in AC and DC 58. Movement of bar magnet in coil 59． Mixed connection of capacitors 60. Pure resistance, inductance, capacitance circuits 61. Magnetic coupling coil sequence 62. Counter-series of magnetically coupled coils 63． How an ohmmeter works 64． Double switch two ground control 65. Use an oscilloscope to observe the hysteresis loop 66． Magnetic Circuit Ohm's Law 67. The mutual inductance of the two coils and the same terminal 68． mutual inductance coupling 69． How to improve power factor 70. Measurement of single-phase circuit power 71. Radio recorder power circuit 72. filter circuit 73. The relationship between resistance and temperature: measuring the filament using voltammetry resistance at different voltages. 74. Three-phase asynchronous motor knife control forward rotation experiment 75. Control circuit with overload protection 76. Button controlled forward and reverse control circuit 77. Contactor control star-delta step-down starting control circuit |
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