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Es Figure-3 Spectral Characteristics 
e S: relative spectral sensitivity 
of the photodiode. P: relative 
Spectral pover distribution of the 
light source. 
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Ee 
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Figure-5 Measuring 
  
  
  
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EM. 
Figure-6 Exposure Measuring 
  
q e : 
ine 
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Figure-4 Measurement Circuit 
OPi: photocurrent amplifier, 
OP2: offset voitage compensator. 
O?3: sample hold amplifier. 
C: feedback capacitor of íncegrator. 
K: feedback resistor. Si: switch 
close: iiluminance mode, open: ex- 
posure mode. $2, 83: sample hold 
switch. The instruments are cont- 
rolled by these switches which are 
ed by the minicomputer. 
  
  
  
  
{ These circuits are manufactured 
by the Soiid State Electronic Device 
Division of Sharp Co., LTD. } 
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Pigure-7 Exposure Diagram 
Practical exposure ( ) and 
normalized exposure (--.-- >. 
t6 effective exposure time.