4 Units Description 
4-34
Figure 4-39 Photometric Instruction 
 
6. When  the  oscillograph displays  the  complete  waves circularly  shown  in  Figure 
4-40, press STOP on the oscillograph. The waves are frozen. 
Figure 4-40 Photometric Wave 
 
7. Magnify the waves shown above and check whether the AD start signal is in the 
middle of the photometric analog signal (See Figure 4-41). If yes, the photometric 
position is correct.