INSULATION ANALYZER AND METHOD

摘要

The insulation current, and therefore insulation resistance, of an insulation sample (5), is obtained by sensing the voltage drop across a resistor (2) in series with the sample (5), and a digital signal representative thereof is generated. The same voltage is differentiated with respect to time and at a given start time a fixed sample is taken and a preselected proportion (ratio) thereof compared against the differential signal until they are equal, measuring the elapsed time until that occurs. With this data a microprocessor (13) derives a constant and calculates the conduction current according to a formula.