POS machine safety contact pressure test device and test method

Abstract

The invention relates to the field of test, in particular to a POS machine safety contact pressure test device and a test method. The shape of a circuit board is cut in a special way to form a cantilever beam, and the safety contact is arranged at the free end of the cantilever beam. The influence of deformation of other parts of the circuit board on the measurement value at a measurement position of a strain gauge under the condition that a POS machine is locked can be avoided. When the joint of the cantilever beam and the circuit board deforms, the strain gauge arranged at the fixed end acquires a strain value, and the pressure value of the safety contact of a POS machine is calculated by a processor. The whole test process has nothing to do with the amount of compression of a silica gel pad. Therefore, the pressure value of the safety contact can be measured accurately under the condition that a POS machine is locked.

Description

technical field [0001] The invention relates to the testing field, in particular to a POS machine safety contact pressure testing device and testing method. Background technique [0002] There are generally one or more safety contacts on the PCB board of the POS machine, which are pre-pressed with a certain pressure value through the silicone pad. The pressure value at this time is called the trigger critical pressure value. At this time, the POS machine will be triggered to enter the security mode, and the internal information can be prevented from leaking by removing the internal information. [0003] However, the trigger critical pressure value of the safety contact of the POS machine is related to the design of the silicone pad. The compression of the silicone pad is the main factor that determines the trigger critical pressure value. However, in actual production, due to the manufacturing tolerance of the silicone pad, Therefore, after the whole POS machine is locked, ...

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Problems solved by technology

[0003] However, the trigger critical pressure value of the safety contact of the POS machine is related to the design of the silicone pad. The compression of the silicone pad is the main factor that determines the trigger critical pressure value. However, in actual production, due to the manufacturing tolerance of the silicone pad, Therefore, after the whole POS machine is locked and paid, the trigger critical pressure value of the safety contact will be different from the nominal value of the safety contact at the time of design.

[0004] However, the current pressure test method for the safety contact of the POS machine is to directly measure the pressure sensor, but because the pressure sensor itself has a certain thickness, it will greatly affect the preload of the silicone pad, so that it is impossible to accurately measure the POS machine after it is locked. Threshold pressure value for triggering of safety contacts

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