Lightning current surge testing stand

Abstract

This invention discloses a lightning current surge testing stand, comprising a cabinet, a through-flow fixture, an oscilloscope and an LER discharging circuit. A main power switch is positioned on the cabinet panel, a single-push button, a constant-impacting button, a time relay, a counting relay, an output terminal, through-flow sampling port, a voltage-limitation sampling port, a digital voltmeter, a manual operation potentiometer knob, a booster knob and a protection switch for a voltage-sensitive through-flow fixture. The LCT discharging circuit electrically connected to electrical members on the cabinet panel is positioned within the cabinet; a piezoresistor to be detected is positioned within the through-flow fixture; the oscilloscope is connected to the through-flow sampling port; the single-push button is pushed and the wave shape is observed; the voltage setting value is adjusted until the 8/20 Mu wave shape of the specific peak value is shown on the circuit; the voltage setting value is fixed; the next batch of the piezoresistors are enclosed and the change of the voltage of the piezoresistor after the through-flow test is compared. In this invention the charging and discharging of the capacitor are controlled by the electric circuit, which simplifies the operation, and pushing the button for one time remotely can finish 1-99 times of surge test.

Description

technical field [0001] The invention relates to the field of piezoresistor flow test equipment, in particular to a lightning current impact test bench. Background technique [0002] The lightning current impact test bench is the equipment used for the flow test of piezoresistors. [0003] The varistor is a non-linear resistor. Usually, the voltage across the varistor when the current flowing through the varistor is 1ma is called the varistor voltage. When the applied voltage exceeds the varistor voltage, its resistance The value decreases sharply with the increase of the applied voltage. Taking advantage of this point, you can use the varistor to protect the circuit of IC and other equipment, and play the role of overvoltage shunt to prevent electrostatic discharge, surge or other instantaneous Damage to equipment caused by static currents (such as lightning strikes). When using it, you only need to connect the piezoresistor to both ends of the circuit to be protected in p...

AI Technical Summary

Problems solved by technology

Too many buttons, complicated operation

2. If there is a misoperation during operation, it may happen that the capacitor is discharged directly without pressing the capacitor charging stop button

At this time, when personnel replace the piezoresistors connected to the test bench, the capacitor is charged at the same time. If unexpected vibration or touch occurs, the test bench will be discharged, and personnel safety accidents will occur.

3. Sometimes it is necessary to impact the same pressure-sensitive sample multiple times in the pressure-sensitive test. At this time, manual operation is prone to misoperation and inefficiency

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