EMI mutual admittance bridge 1997A (internal designation:Impedance Bridge type II) s/ n385349, c. 1935 EMI mutual admittance bridge 1997A, c.1935 1935
Wayne Kerr VHF admittance bridge B801, serial number 714, with box of spares. The Wayne Kerr VHF admittance bridge B801 could be operated at any frequency from 1-100MHz for the simultaneous measurement of the capacitance and conductance of aerials, feeders, lines and components, whether balanced or unbalanced. A wide measurement range was available from only a few Standards whose effective values were extended by the use of ratio transformers. This technique permitted the values of the Standards to be selected for maximum stability and minimum phase-angle. A number of accessories were also provided by Wayne Kerr Laboratories. Wayne Kerr VHF admittance bridge B801