| Abstract: | Conclusions The above technique and the cited examples for computing the voltage from electron-diffraction patterns of NaCl show that it is already possible to measure by means of an electron-diffraction camera éG-100 A high dc voltages up to 100 kV with an error of 0.1–0.2% For certain specimens whose electron gun can withstand voltages up to 120–150 kV the maximum measurement range is extended accordingly. Therefore, the above method of measuring high dc voltages can be used for checking high-tension instruments, including electrostatic kilovoltmeters. Moreover, the same method can be used for measuring the ratios of high-tension dividers directly with the operating voltages across them, which could not be done so far. In measuring the ratio of dc dividers by comparing them with reference resistors at low voltages it is impossible to evaluate the errors due to the heating of resistors by the operating current, to corona discharges, to leakages and space charges along the surface of the divider.The utilization for these purposes of an absolute method which consists of measuring high voltages by the diffraction of electrons raises the reliability of test results and undoubtedly will be of interest for practical application. |
