Operation
TM/
TMC/RM/RMC-2030GE
- 59 -
10.5.4 Pulse Width Control Mode
In Pulse Width Control (PWC) Mode, the exposure time is controlled by the external trigger. When an
external trigger is applied, one discharge signal (Vsub) is generated right after the active edge of the
trigger. The exposure starts when the discharge signal is in the off state. The exposure is off follow-
ing the trigger active off. Exposure time is controlled by the pulse width of the external trigger.
Because the CCD requires some overhead from trigger active off to the transfer gate event, the
actual exposure time is equal to:
Exposure Time = Pulse Width +12.4
μ
s
Since one discharge signal (Vsub) is generated right after the active edge of the trigger, it is asynchro-
nous with LDV, and the discharge signal may happen during an active video transfer period, visible
reset noise may show in the current image. To avoid reset noise, the maximum trigger frequency in
PWC mode should be less than 1/ (exposure time + one frame transferring time).
The minimum active period of the external trigger is 5
μ
s
. Theoretically, the maximum active period
of the external trigger is unlimited. But, due to the usability of images at 25
o
C it is recommended the
active period of the external trigger be no longer than one second.
Figure 58. Pulse Width Control Trigger
Summary of Contents for RM-2030GE
Page 1: ...User s Manual Document Version C Document P N 10446 TM TMC 2030GE Progressive Scan Cameras ...
Page 2: ...TM TMC RM RMC 2030GE ii ...
Page 5: ...TM TMC RM RMC 2030GE v ...
Page 6: ...TM TMC RM RMC 2030GE vi ...
Page 10: ...Table of Contents TM TMC RM RMC 2030GE x ...
Page 14: ...List of Tables TM TMC RM RMC 2030GE xiv ...
Page 77: ...Operation TM TMC RM RMC 2030GE 63 Figure 63 Field Video Timing Continuous Mode ...
Page 83: ......