Clamp-type Ammeter Circuit Based On The Multi-function Calibration Source Automated Testing

In this paper, the study, which is based on the standard multi-function digital calibration signal source, apply automated testing system to calibrate the Jam Current meter. Including self-calibration of the multi-function digital calibration signal source and its control, providing the stimulation to the Jam Current Meter, and testing the response of Jam Current Meter(JCM) by a data acquisition card(model NI5620), the description is presented in detail. Overall, the national standard applied to the Jam Current Meter is introduced in the form of the various parameters and test condition. The proposed Automation Testing System (ATS) posed the characteristics in speed,accurate, efficient etc..Combined with realize work and test theory, this paper studies automatic test system importance of research, digital Jam current meter Automatic Test System hardware and software design, the measurement results of data processing and system uncertainty, the standard unit test the stability and repeatability for analysis.The system consists of the multi-function standard signal source, data acquisition system, GPIB bus, JCM under test, PC. The multi-function standard source outputs corresponding standard signals according to the instruction from PC. The data acquisition system and the GPIB bus are responsible for the acquisition and transmission of data. The JCM under test measures the signal from the multi-function standard source and outputs the result. The PC is central core of the whole system. It finishes instruction transmission, data reception and estimates the uncertainty automatically. Finally to receive automatic data processingThe practicality of the system high, not only to avoid errors caused by manual test and measurement results can be achieved automatic analysis and intelligent choice, greatly reducing the uncertainty of measurement results to ensure accurate and reliable measurement results.