FIELD: instrumentation, test of insulation resistance of cores and sheaths of communication cables and pipe-lines. SUBSTANCE: technical objective of proposal consists in expansion of range of tested resistance with simultaneous reduction of tested voltage up to 15.0 V, in increase of noise immunity of gear due to use of voltage tapped off additional resistor instead of insulation leakage current and to employment of low-pass filter based on gyrotron with cutoff frequency less than 5.0 Hz and high input resistance up to 1000.0 megohm. Usage of gear provides for following advantages: increased noise immunity, reduced total cost of gear as result of employment of simple in design and widely used elements, decreased power of voltage source due to use of reduced test voltage. EFFECT: reduced total cost and increased safety of gear. 1 dwg
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