B. Calibration and Test Procedure 



Before the wave staff can be lowered over the side for operation, 

 the gage and recorder must be calibrated and tested. This must be 

 done before each lowering as follows: 



1. Test the pen of the recorder for proper inking and pen pressure. 



2. Connect the electrical cable from the wave staff to the input 

 on the back of the recorder case. Plug in the power supply cable. Ad- 

 just the variac dial on the front of the recorder case to read about $2. 

 Stand clear of the step-resistance gage section of the wave staff. 

 Turn the main power supply switch to "On" position. This switch is 

 located on the front of the recorder case. Next, adjust the manual 

 lever on the side of the Brush recorder pen motor so that the pen 

 trace is on the bottom line (nearest the front of the case) of the 

 chart paper. When this is done, turn the main power switch to "Off" 

 position. 



3. After making certain that the main power switch is off, attach 

 25-foot wire leads to the uppermost and lowermost contact points and 

 lower the two leads over the side into the water, assisted by sinkers. 

 The lower ends of these leads should be bare. Care should be taken to 

 secure these leads aboard ship to prevent accidental loss over the side. 



U. When both leads are in the water, about 12 feet apart and away 

 from the ship, s tand clear of the gage and turn the main power supply 

 switch to the "On" position. Adjust the variac knob in the center of 

 the front panel so the recorder pen is on the top line (toward the 

 back of the case) of the chart paper. With power off detach one of 

 the leads. Then with power on, set the pen back on the bottom line 

 by means of the manual adjusting lever on the side of the recorder 

 pen motor. Attach the lead once more with the power off j and after 

 turning the power on set the variac so that the pen is on the top 

 line again. Repeat this operation until the pen is on the bottom 

 line with lead detached and on the top line with lead attached. 



5. Label the calibration run on the chart paper and record the 

 voltage setting. Retain the calibration run with the record of each 

 wave staff observation. 



6. For most practical purposes, the gage calibration can be 

 assumed to be linear. 



C. Lowering and Operating the Electric Wave Staff 



1. Make sure the main power supply switch is "Off". Lift the 

 staff and damping disk over the side. Using the two handling lines 

 and the retrieving line on the damping disk, lower the assembly into 

 the water. 



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