Patent ID: 6943567
Filing Date: 2005-09-13
Classification: G01R

Abstract:
1. A method for verification of the operability of two or more identical zener diodes which are connected in parallel with one another and are connected in a circuit to a solenoid coil, the method comprising a first step of measuring the electrical values of the zener diodes ( 12 , 13 , 14 ) and of the solenoid coil ( 11 ) before assembly of the circuit, and, after assembly of the circuit, a second step of measuring the total capacitance (C tot ) of the parallel circuit ( 10 ) that is formed from the solenoid coil ( 11 ) and the zener diodes ( 12 , 13 , 14 ), wherein, in the method, the capacitance (C 11 ) of the solenoid coil ( 11 ) is subtracted from the total capacitance (C tot ), and the remaining value is divided by the number of zener diodes ( 12 , 13 , 14 ), and the result of this calculation is compared with the capacitance (C 12 , C 13 , C 14 ) of an individual zener diode ( 12 , 13 , 14 ), with the difference between these values being used as a criterion for the operability of the zener diodes.