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# How to handle analog fault diagnosis problem of tolerance

1 slope of the fault model of profile

Fault dictionary method is a method of testing before the simulation is the most practical and NC7SZ66P5X datasheet and sophisticated fault diagnosis. Traditional fault dictionary method is generally considered a single circuit failure and NC7SZ66P5X price and hard failure. [1], no tolerance for linear analog circuits, a circuit can simultaneously diagnose soft faults and NC7SZ66P5X suppliers and hard faults in the node-voltage sensitivity sequence fault dictionary method, which used qualitative relationship between the node voltage between the size of the single-fault diagnosis . [2] the right to construct the node-voltage sensitivity sequence fault dictionary.

[3] proposed a linear tolerance analog circuits the ratio of the node-voltage sensitivity sequence fault feature, so in theory be able to handle by the tolerance of the analog circuit fault diagnosis, fault dictionary but not constructed. [4] further proposed the slope of the fault model, the slope component extraction circuit fault in the structural characteristics of soft fault dictionary. The literature [5] analyzed the components when a parameter or group of changes, a number of nodes in the circuit between the voltage increment equation is a homogeneous linear equation, the linear correlation coefficient ratio as a fault feature simultaneous diagnosis of multiple faults in the circuit and soft failures, in fact, the promotion for the slope of the fault model. No tolerance in the circuit, the slope of the fault model can solve the fault diagnosis of analog fault diagnosis of soft, but not solve the problem of tolerance. Tolerance problem was, although the literature [4-5] use the shortest distance method to deal with the problem, but as this article demonstrates, the practical application of this method is less effective when the circuit is complicate and even get an error results. Slope of the fault model and diagnostic methods detailed derivation can be found in the literature [4,6], the slope of the fault characteristics of the circuit can be calculated using the following formula:

Where, V10, V 20 for the fault-free circuit test points selected (t1 and t2) (test point selection problem is not the scope of this article, refer to the literature [7-12]) on the voltage: V 1, V 2 for the circuit after the failure of measurement points (t1 and t2) the voltage value.

Assumed curve in Figure 1, four were in a linear circuit elements 4 xi, xj, xm, xn the slope of the linear fault features. It can be seen by the public point of each line (V10, V20) and the slope of the two elements of k determined.

Figure 1

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