The SRP-50k0 - 10G0 calibrator is a source of high resistance, used as a standard in calibration and tests of analogue and digital insulation resistance meters. The setted resistance by the calibrator can be maintained for a long time under external direct voltage up to 2500 V, provided that the current in the measuring circuit does not exceed 1,5 mA. The required resistance is set by the user using the calibrator's touch keypad or via an external PC application. The required value is set automatically thanks to the switching of a precise resistance matrix. The controlling processor calculates the required combination of resistors, ensuring adequate resistance precision.