Instruments IETS

IET line widths are determined by thermal and instrumental broadening, the latter being primarily due to the applied modulation voltage. With a superconducting Pb counter-electrode, the full-width-at-half-maximum (FWHM) of an IETS peak is given roughly by [ 15 ]... 

The test instruments and test leads used by the electrician for testing an electrical installation must meet all the requirements of the relevant regulations. The HSE has published guidance note GS 38 for test equipment used by electricians. The IET Regulations (BS 7671) also specify the test voltage or current required to carry out particular tests satisfactorily. All test equipment must be chosen to comply with the relevant parts of BS EN 61557. All testing must, therefore, be carried out using an approved test instrument if the test results are to be valid. The test instrument must also carry a calibration certificate, otherwise the recorded results may be void. Calibration certificates usually last for a year. Test instruments must, therefore, be tested and recalibrated each year by an approved supplier. This will maintain the accuracy of the instrument to an acceptable level, usually within 2% of the true value. 

Table 4 gives the debris recovery summary of the IET-1, IET-3, and IET-6 experiments. The results are reported for four basic locations (1) from inside the subcompartment structures, (2) from the Surtsey vessel outside the structures, (3) from the cavity and instrument tunnel chute, and (4) from the crucible. The total molten mass available for dispersal into the vessel is usually about 20 percent greater than the initial iron oxide/aluminum/chromium thermite charge due to the melting of the inner wall of the crucible, vaporization of the fusible brass plug, ablation of concrete in the cavity, and oxidation of metallic debris [Ref. 8]. 

Table 6 stunmarizes the results of the IET-1, IET-3, and IET-6 tests. In the lET experiments, 43 kg of molten iron oxide/aluminum/chromiTim thermite was ejected by slightly superheated steam through a hole in a graphite limitor plate into a 1 10 linear scale model of the Zion reactor pressure vessel, cavity, instrument tunnel, and subcompartment structures, steam blowthrough entrained the molten debris into the Surtsey vessel. 

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