Electric bridge for experiment
An experimental, bridge technology, applied in the direction of AC/DC measurement bridge, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve problems such as trouble, affect the sensitivity of the galvanometer, and the power supply voltage is not adjustable.
Inactive Publication Date: 2004-01-07
骆乃光
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Problems solved by technology
[0002] The voltage of the power supply used by various electric bridges currently available in the market is not adjustable, so to verify that "the voltage of the bridge on the diagonal line of the power supply affects the sensitivity of the galvanometer", this conclusion experiment is more troublesome to do. When experimenting with type sensors, it is always hoped that the resistance value of the sensor can change the ammeter connected to the diagonal line of the galvanometer from zero to full scale in a certain range of changes. The existing various bridges cannot do this, and must External sliding wire resistors are used to adjust the voltage on the diagonal of the power supply of the bridge body, so that the voltage on the diagonal of the galvanometer just makes the ammeter full, and when the resistance of the sensor changes, the output voltage of the corresponding galvanometer terminal changes to non-linear. Linear, there is no bridge with linear output at present, and there is no bridge powered by a constant current source
[0003] For all kinds of electric bridges produced now, the positions of the two proportional arms cannot be exchanged, and the error of the proportional arms cannot be eliminated.
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[0018] Figure 1 is an embodiment of the present invention.
[0019] In Fig. 1, the battery pack 21 supplies power to the bridge body after passing through the wire resistance 6. When the resistance value of the wire resistance 6 increases, the voltage between ACBs decreases, and when the resistance value of the wires decreases, the voltage between ACBs increases. Big. In the bridge body, resistors 1 and 2 form the proportional arm, and resistor 3 forms the comparison arm. After the measured object 4 is connected to the terminal B' and D', the coarse adjustment is performed by adjusting the proportional arm resistance 1 and 2, and the comparison arm resistance 3 is adjusted. Fine adjustment, when the zero indicator points to zero, the bridge is balanced, at this time
[0020] When the object 4 to be measured is a resistive sensor, if it is required that the indication range of the zero indicator coincides with the variation range of the sensor, the starting point of the vari...
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The invention is a test bridge, during physical testing in the colleges and universities, able to measure resistance and use various resistance senses for non-balanced bridge test. It has two proportional limbs, one compare limb, and the other used to link with the measured quantum; the bridge circuit's voltage can be continuously adjusted, and it has division circuit, which makes the output voltage between two sides of galvanometer and the resistance value's variation of the measured quantum linear.
Description
technical field [0001] The present invention relates to the measurement of electrical resistance, and a device for carrying out experiments with resistive sensors. Background technique [0002] The voltage of the power supply used by various electric bridges currently available in the market is not adjustable, so to verify that "the voltage of the bridge on the diagonal line of the power supply affects the sensitivity of the galvanometer", this conclusion experiment is more troublesome to do. When experimenting with type sensors, it is always hoped that the resistance value of the sensor can change the ammeter connected to the diagonal line of the galvanometer from zero to full scale in a certain range of changes. The existing various bridges cannot do this, and must External sliding wire resistors are used to adjust the voltage on the diagonal of the power supply of the bridge body, so that the voltage on the diagonal of the galvanometer just make...
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IPC IPC(8): G01R17/10G01R27/02
Inventor 骆乃光
Owner 骆乃光