Method for diagnosing a bias supply for an acquiring system comprising a matrix-array interface device
A method for diagnosing a bias power supply for an acquisition system including a matrix-array interface device having conductive rows and columns, each row being connected to an input port and to a bias power supply, each column being selectively connected to ground by controlling an output port, and at each intersection either a circuit or a shunt, connected between the intersected row and the intersected column, including the following steps: controlling an output port so as to ground a shunt, reading the input port corresponding to the shunt, a low state indicating a normal presence of the power supply, a high state indicating an abnormal absence.
1. A method for diagnosing a bias power supply for an acquisition system comprising a processing unit and a matrix-array interface device comprising a first number of conductive rows, a second number of conductive columns, each row being connected to an input port of the processing unit and to a bias power supply, each column being selectively connected to ground by controlling an output port of the processing unit, each row intersecting a respective one of each column to form a plurality of intersections, a respective circuit of a plurality of circuits at each of the plurality of intersections, one terminal of each respective circuit is connected to the intersected row and another terminal of each respective circuit is connected to the intersected column, and a respective shunt of a plurality of shunts connecting the intersected row and the intersected column, so as to have one shunt per row and per column, the method comprising:
controlling an output port so as to ground a selected column of the columns via a selected shunt of the plurality of shunts; and
reading the input port corresponding to said selected shunt:
a low state reading at the input port indicating a normal presence of the power supply associated with the row including the selected shunt, and
a high state reading at the input port indicating an abnormal absence of the power supply.
2. The method as claimed in claim 1 , further comprising:
stopping the control of said output port, and
reading the input port corresponding to said selected shunt, a low state indicating an abnormal presence of the power supply associated with the row including the selected shunt, a high state indicating a normal absence.
3. The method as claimed in claim 1 , wherein the controlling and reading steps are repeated for each of the columns.
4. The method as claimed in claim 1 , wherein at least two rows of the rows are connected to one and the same power supply, and the method also comprises comparing the readings of the input port corresponding to one of the two rows and the readings of the input port corresponding to the other of the two rows, a match indicating normal operation of the power supply, a mismatch indicating short-circuiting of the power supply.
5. The method as claimed in claim 1 , wherein each respective circuit and each respective shunt is connected to its column via a diode oriented so as to prevent a current from flowing from ground.
6. The method as claimed in claim 1 , wherein each row is connected to its input port via a resistor.
7. The method as claimed in claim 1 , wherein each power supply is connected to its row via a resistor.
8. The method as claimed in claim 1 , wherein each column is selectively connected to ground via a transistor controlled by an associated output port.
9. The method as claimed in claim 2 , wherein the stopping and reading steps are repeated for each of the columns.