4.4o3 Running the Test 



When the sensor head and recorder have been connected to 

 the electronic control section it may be turned on. 

 Allow it to warm up for 30 sec. 



Adjusting the instrument for the rope being tested is 

 carried out as follows: 



i) Start the chart recorder in the Time Base mode, 

 at some convenient chart speed. (Imm/sec.) 



ii) Set the multi position sensitivity switch on the 

 LMA Channel for the desired LMA sensitivity. This 

 should be done so that the highest and lowest LMA 

 readings will remain on the chart. The sensitivity 

 settings and their corresponding LMA sensitivity is 

 shown in Table 4.2. 



Table 4.2 



Chart Recorder Sensitivity LMA Sensitivity 



5mv/mm 25% LMA full scale 



(.5% LMA/mm.) 



2mv/mm 10% LMA full scale 



( .2% LMA/mm.) 



Imv/mm 5% LMA full scale 



(.1% LMA/mm.) 



iii) Zero both channels by using the shorting plugs 

 provided in the LMA and LF Channel Outputs 

 (See Fig. 4. 2) and by adjusting the chart recorder 

 position controls. The LF channel should be zeroed 

 in the centre of the trace and the LMA channel, 2 

 large divisions above the centre of the trace so 

 that both positive and negative LMA changes may be 

 kept on the graph. 



A-27 



