Test circuit board open-circuit and short-circuit device

Abstract

The invention discloses an open-circuit and short-circuit device for a test circuit board. The device comprises a single-chip microcomputer, a first one-out-of-multiple switch and a second one-out-of-multiple switch, two groups of control interfaces of the single-chip microcomputer are respectively connected with the first one-out-of-multiple switch and the second one-out-of-multiple switch, a common end of the first one-out-of-multiple switch is grounded, and a common end of the second one-out-of-multiple switch is connected with an AD function pin. Compared with the prior art, the problem ofshort circuit misjudgment of a circuit welded with IC devices in the circuit is solved, the outflow of defective products is reduced, and meanwhile, the cost of manual maintenance due to misjudgmentis also reduced; the open circuit and short circuit of at least two lines can be tested at the same time, the practicability is high, and the accuracy is high.

Description

technical field [0001] The application belongs to the technical field of circuit board testing, in particular to a device for testing circuit board open and short circuits. Background technique [0002] The electronic product control board is usually composed of electronic components welded on the PCB board, and in the production process, there are often open circuits or short circuits in the circuit board during the production process, and there are often missing soldering or welding when soldering electronic components. The phenomenon of connecting tin, and these phenomena will cause the abnormal use of the control board. In order to avoid the outflow of defective products, it is necessary to conduct an open circuit and short circuit test to intercept the defective products. Such as figure 1 For the existing open-short-circuit test scheme, the two ends of the tested product are connected to two sets of IO ports of the single-chip microcomputer, one end of the IO port inpu...

AI Technical Summary

Problems solved by technology

However, this method is not suitable for soldering IC components on the circuit. When testing a short circuit, the high level may be pulled down when passing through the IC device, which will affect the judgment.

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