The total number of points in the entire sample is 

 what is needed and N represents only that number in the 

 interval Ax. However, we have normalized data and 

 therefore 



I,w(x)Ax = 1 (B-4) 



/ T 



N = ZNAx = 2__-. ( B _ 5 ) 



(3/87T)s 



Calculations performed with this equation agree well with 

 some data taken using the pulse output of the PDA. Figure 

 Bl, curve B, shows the results of equation B-3 for T = 1 

 second, and w(x) = w(0) - 0.4, or 



If = 1.16/ (B-6) 



o 



The theoretical curve is compared with actual 

 measurements taken from the PDA pulse output using a 

 counter with a 1 -second sampling interval. The slight 

 difference between the two is due to an error in the actual 

 cutoff frequency of the filter. The effective bandwidth of 

 the filter is a little larger, about 1.12 times the set value. 



44 



