Hitachi HV-F31F - Manual (Page 29)

15
-Manual adjustment-
Setting value 82000xxx h xxx: (HV-F22) 7C5h to B6Ch / (HV-F31) 789h to B27h
Electronic shutter can be set in the range of 4 to 1/100,000 second.
Shutter speed setting value can be derived as follows.
OFF_SPEED = 15 (HV-F22), 30 (HV-F31).
• Cause of shutter speed ≦ (1 / OFF_SPEED)
a) Setting value obtained from fluorescent time.
nnnh = 800h + log
0.99
( OFF_SPEED×”Shutter Speed”)
b) Fluorescent time obtained from setting value.
Shutter Speed[sec] = OFF_SPEED × 0.99 (nnn―800h)
Ex. 1 Fluorescent time with HV-F31 = setting value nnn to obtain 1/100 second.
800h+ log
0.99
(30×(1/100))
= 800h+ log(30×(1/100)) / log0.99
= 878h
Ex. 2 Setting value nnn that produces 1/100 second fluorescent time with HV-F31F.
(1/30) × 0.99 (878h － 800h) = 1/100(sec)
• Cause of shutter speed > (1 / OFF_SPEED)
a) Setting value obtained from fluorescent time.
nnnh = 801h - ( OFF_SPEED×”Shutter Speed” )
b) Fluorescent time obtained from setting value.