Calibration of proportional counter tube - involves regulating high tube supply voltage depending on counter tube current

摘要

The high supply voltage to the tube (40) is regulated depending on the counter tube current. The current (Iist) for a standard radiator is compared with a desired value (Iso11) to derive the input value to a controller (25) which produces the supply control parameter. An input value e representative of the error in the high supply voltage is derived from the actual value (Iist) and the desired value (Iso11) according to the following relationship: e = log (Iso11)-log(Iist) or e = log(Iso11)/(Iist). USE/ADVANTAGE - For calibrating a proportional counter tube operated in the current mode. The method ensures stable, accurate regulation of gas amplification using a simple, reliable measurement instrument.