Connection method of continuity measurement circuit for electrical accessories of aeroengines

Abstract

The invention provides an aeroengine electrical accessory conductivity measurement loop connection method, and the method comprises the steps of distributing vertical channels with double-point matrix switches to a test device and a measured piece; finding a key node on the double-point matrix switches in a conductivity measurement loop; controlling the on-off of a double-point relay at each node of the double-point matrix switches to form a control program of a two-wire system or a four-wire system conductivity measurement loop; and wiring and running the control program to establish the physical connection of the conductivity measurement loop. The double-point matrix switch channels are grouped, thereby having a restriction for arranging the conductivity measurement loop; making any two adjacent vertical channels of the double-point matrix switch accessed with the measured piece, in the same group or not, can participate and form the two-wire system conductivity measurement loop, and the polarity can be exchanged without wiring again; and making any four adjacent vertical channels accessed with the measured piece, in adjacent two or three groups, can participate and form the four-wire system conductivity measurement loop. The wiring flexibility and quantity of the measured piece to be connected are raised in the maximum.

Description

technical field [0001] The invention belongs to the field of automatic testing, and specifically refers to a method for connecting a continuity measurement circuit of an aeroengine electrical accessory. Background technique [0002] At present, the mainstream jet aircraft engines in the civil aviation industry use a large number of electrical accessories, including electromagnetic valves, actuators, sensors, etc. There are many types of these parts, and the connected electrical lines are extremely complicated. Usually, if short circuit, circuit aging, poor contact and other faults occur, the electrical conductivity of the accessory will change. Therefore, continuity measurement is an important means for troubleshooting electrical accessories of aeroengines. For general large on-resistance measurement, use a two-wire continuity measurement circuit for measurement, and for small resistance measurement, you need to use a four-wire continuity measurement circuit for measuremen...

AI Technical Summary

Problems solved by technology

This not only wastes limited channel resources, but also increases the workload of the designer's line layout

If a group of longitudinal channels are connected as one longitudinal channel to the two measurement signal terminals of the measuring instrument, a large number of longitudinal channels will be wasted

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