This process signals source (the calibrator in the following) is a handheld, battery-operated instrument that sources electrical and physical parameters.. l Source DC voltage, DC current, resistance, simulate Transmitter, TC, RTD, frequency, pulse and switch.. Big LCD can display the TC/RTD measurement value and mV/ corresponding simultaneously. mA and mA% simultaneously. TC source terminals and built-in lead connector of same temperature (RJ compensation with auto-reference joint point). Manual step source and auto -step and sweeping step source Room temperature monitoring under any operation