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AC electric bridge demonstration instrument

A technology of AC bridge and demonstrator, which is applied in the direction of instruments, educational tools, teaching models, etc., can solve the problems of redundant, redundant functions, large devices, etc., and achieve the effect of eliminating false balance, reducing the number of instruments, and reducing the volume

Inactive Publication Date: 2003-06-25
骆乃光
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Using six instruments to do AC bridge experiments, the device is too large; and among the six instruments, most of the functions of four instruments are redundant: the two AC resistance boxes are each used as a real number bridge arm and a low-frequency signal generator, here As an AC power supply, as long as the frequency is 1KHz, and it is a sine wave, its rectangular wave, triangular wave, sawtooth wave, spike wave, and higher frequency output are useless; the oscilloscope is only used as a zero point at a frequency of 1KHz in this experiment. instrument, its frequency bandwidth, scanning various speeds are redundant

Method used

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Embodiment Construction

[0019] exist figure 1 When switch 9 and switch 10 are in the positions shown in the figure, the AC power supplies power to the bridge, and the current input terminal A flows through the two bridge arms in two ways, and one way flows into the input terminal C of the zero indicator through the measured impedance Zx, and the other All the way through the capacitor box C 0 with resistance box R 1 The bridge arm in series enters the input terminal D of the zero indicator 7, the input terminal D of the zero indicator 7 flows into the power supply terminal B through the bridge arm 3, and the input terminal C of the zero indicator 7 flows through the bridge arm 2 composed of a rotary switch and a resistor and flows into the power supply terminal B, figure 2 It is its simplified circuit diagram, which is mainly used to measure the capacitance with small loss.

[0020] exist figure 1 In the middle, turn the switch 9 to the middle gear, and the bridge arm 3 connected in series with ...

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Abstract

The present invention provides one AC electric bridge demonstration instrument for college student to perform experiment. It has two arms comprising rotary switch and resistor and other two arms comprising resistor box, capacitor box or inductor box. It is used in perform various classical electric bridge demonstration experiments of resistor, capacitor or inductor as well as RLC serial resonance and parallel resonance experiments with no other instrument being needed.

Description

technical field [0001] The invention relates to a demonstration device for measuring resistance, capacitance and inductance, and can also carry out resonance experiments. Background technique [0002] At present, in the "electromagnetic" experiment of colleges and universities, there are 6 instruments required for the experiment of the AC bridge principle, such as the list of instruments listed on page 281 of the first edition of "New University Physics Experiment" published by Sinopec Press in 1998. : There are four types of low-frequency signal generator, transistor millivolt meter, decade capacitor box, and decade resistor box. However, it can be clearly seen from the circuit diagram that there are not one but three decade resistor boxes here. Another example is the list listed on page 144 of the first edition of "University Physics Experiment" by Science Press in February, 2001 to the AC bridge experiment; audio signal generator, oscilloscope, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09B23/18
Inventor 骆乃光
Owner 骆乃光
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