Semi-wave impulse current automatic testing device of pressure-sensitive resistor disc

Abstract

The invention is an impacting current automatic testing device based on voltage dependent resistor, which includes booster and a transformer connected to the booster. One end of the transformer is connected to the input ends of the controllable switch to the positive and negative electrodes, the control input end of the controllable switch is connected to the pulse transformer, the output end of the controllable switch is connected to the high voltage testing electrode, the low voltage testing electrode is also connected to the half-wave testing and controlling units, there arranges a punch tape transmitting mechanism and detecting mechanism connected to the half-wave testing and controlling unit on the control desk. The invention sends the punch tape carrying voltage dependent resistor into the detecting mechanism through the half-wave testing and controlling unit, when the photoelectric detector on of the detecting mechanism detects the leading line of the voltage dependent resistor, the half-wave testing and controlling unit send out testing signal, and push the electric magnet to drive the rotary block to rotate, the high voltage electrode and the low voltage electrode are connected with the voltage dependent resistor leading wires, and starts the automatic test.

Description

technical field [0001] The invention belongs to a device for testing electrical properties of a piezoresistor sheet, in particular to a half-wave impulse current automatic tester based on a piezoresistor sheet. Background technique [0002] According to IEC and national standards: each zinc oxide valve plate that leaves the factory should be screened by a 2ms square wave, that is, the flow capacity tolerance test. The current capacity withstand test of the varistor is usually carried out by sampling the 2ms impulse current generator of the zinc oxide resistor, and the defective varistor cannot be completely screened out. So far, there is no high-efficiency test device for the current capacity withstand test that can be specially used for varistors. The varistor sheet adopts the 2ms impulse current generating device of the zinc oxide resistance for the test, which has the following disadvantages: (1) The structure is huge and complex, and many artificial transmission lines c...

AI Technical Summary

Problems solved by technology

The varistor sheet adopts the 2ms impulse current generating device of the zinc oxide resistance to conduct the test, which has the following disadvantages: (1) The structure is huge and complex, and many artificial transmission lines composed of capacitors and inductors are needed to form a 2ms square wave; (2) Test efficiency Low, the speed of this test is at most dozens of pieces / minute; (3) The work intensity is high, because the 2ms square wave is a single-polarity single pulse wave, and the positive and negative polarities of the piezoresistor must be checked. Energy test, the process is complex, time-consuming and laborious; (4) high cost, this test method needs to use PLC and multiple pneumatic components to complete the control process, so the cost of equipment is relatively high

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