Hamamatsu Photonics C15550-20UP, Instruction Manual

Page: 32 / 72

qCMOS Camera C15550-20UP / C15550-20UP01 Instruction manual_Ver.1.3
30
(3) Sub-array readout
Sub-array readout is a procedure where only a region of interest is scanned. It is possible to
increase the frame rate by reducing the number of vertical lines scanned. In sub-array readout,
binning can also be enabled.
Size and a position of the readout area can be configured according to the table below.
Size Position
Horizontal Vertical Horizontal Vertical
4 pixels 4 lines 4 pixels 4 lines
• Minimum settable step of the size and position on the table is in only the case that the camera is used
with DCAM-API.
• Refer to 11-1-4 “FRAME RATE CALCULATION” about the frame rate of each readout mode.
11-1-3 READOUT SPEED (SCAN SPEED)
The Standard scan readout speed can achieve a frame rate of 120 fps for full resolution with low noise
(0.43 electrons (r.m.s.)) and the Ultra quiet scan readout speed can achieve extremely low noise (0.27
electrons (r.m.s.)).
The CoaXPress interface is required to transfer the full resolution image data at the full speed of 120
frames per second. When you use USB interface, a maximum of 17.6 fps is achievable for full resolution.
The frame rate with USB interface can be faster if you reduce the digital output to 12 bit or 8 bit data.
Scan speed Digital output
Frame rate for full resolution
CoaXPress USB
Standard scan
16 bit
120 fps
17.6 fps
12 bit 23.5 fps
8 bit 35.3 fps
Ultra quiet scan
16 bit
5.00 fps 5.00 fps 12 bit
8 bit
• Refer to 11-1-4 “FRAME RATE CALCULATION” about the frame rate of each readout mode.
• Ultra quiet mode is used for the Photon number resolving mode.