Free Running Mode; Normal Readout Mode; Electrical Shutter Mode - Hamamatsu Photonics C11440-36U Instruction Manual

C11440-36U Instruction Manual Ver.1.1
9-3

FREE RUNNING MODE

The camera has Free running mode which the exposure and readout timing can be set by
software command and controlled by an internal microprocessor. Free running mode has Normal
readout mode (in which the exposure time is longer than the 1 frame readout time) and Electrical
shutter mode (in which the exposure time is shorter than the 1 frame readout time). These
readout modes are automatically switched depending on the exposure time setting.
• Please contact to Hamamatsu subsidiary or local distributor for the detail of the timing
information.
9-3-1

NORMAL READOUT MODE

Normal readout mode is used so that the exposure time can be extended to collect more signals
and increase the signal-to-noise ratio if the object is dark.
Internal exposure time
setting
Readout start signal
0H
1H
2H
・
・
(LAST-1)H
(LAST)H
Sensor readout
Camera data output
Global exposure timing
output
9-3-2

ELECTRICAL SHUTTER MODE

Electrical shutter mode is used to get a proper signal level when signal overflow happens due to
too much input photons in Normal readout mode.
Internal exposure time
setting
Readout start signal
0H
1H
2H
・
・
(LAST-1)H
(LAST)H
Sensor readout
Camera data output
Global exposure timing
output
16
*1
Exposure time Exposure time
Figure 9-2 Normal readout mode
*1
Exposure
Figure 9-3 Electrical shutter mode
Exposure time
*1 The memory standby time = 10H (≈ 124.4 µs)
Exposure Exposure
*1 The memory standby time = 10H (≈ 124.4 µs)
Exposure time
Exposure