The Noise Immunity of Teraohmmeters Based on Current Measuring Instruments

The results of an investigation of existing teraohmmeter circuits using the criterion of noise immunity are described. Based on this criterion, the most optimum circuit, which has a measurement time of not more than 30 sec, is chosen. The noise level at a frequency of 50 Hz is estimated. The range of measurements in the experiments is 1 MΩ – 1000 GΩ.