Fig. 3.7 Missing Wire in 1" full locked coil 

 hoisting rope. 



3.2.3 Static Measuring Capabilities 



The Hall sensor measures field statically or dynamically 

 This allows the Magnograph to be virtually insensitive 

 to rope speed. Maximum rope speeds are controlled by 

 the speed of response of the recording medium and the 

 bandwidth of the control instrumentation rather than 

 the magnetic circuit. 



This ability is most useful when pin pointing local 

 faults as the sensing head can be brought very slowly 

 to a fault and stopped on it. 



A-12 



