TMB 46083 



Figure 6 - Recorder and Accelerometers 



Figures 2 and 3 show a front view of the recorder with its airtight 

 cover opened. There are 5 channels and 2 sensitivities (XI and X3) available 

 per channel. The lower sensitivity will usually be used. Each recording pen 

 has a chart strip 2 inches wide provided for it, and positive stops are pres- 

 ent which limit the travel of the pens to this value; the pen drive motors 

 cannot be overloaded. The chart speed-control lever can be seen at the far 

 left of the photographs. It permits a selection of speeds of 1/2 or 1 inch 

 per minute; these chart speeds are sufficient to give ample resolution of the 

 oscillograms for the purpose intended. The recording chart (Figure 7) has 

 a plastic-coated surface which is sensitive to pressure applied by the record- 

 ing pens; the surface does not smudge with ordinary handling. 



Normally the unit will be used as a sampling device, and a record 

 of 2 minutes duration will be made at hourly intervals. The procedure is as 

 follows: The power is turned on and about one hour is allowed for the unit to 

 warm up. Then the chart drive switches are thrown to the "ON" and "TIMED" 

 positions. The recorder, will now take a record at hourly intervals. If it is 

 desired to record continuously, it is merely necessary to throw the chart 

 drive switch to the "CONTINUOUS" position. If, while the recorder is set for 

 the automatic cycling operation, it is desired to record continuously for a 



