Configuring Exposure Time - Hamamatsu Photonics C11440-42U Instruction Manual

C11440-42U/C11440-42U01 Instruction manual_Ver.1.1
9-5

CONFIGURING EXPOSURE TIME

The exposure time setting can be done by absolute value. The actual exposure time setting is
defined by the following formula, and the camera automatically calculates a larger and closest
value from the specified exposure time setting.
• The Exp1 values must be input to the calculation formula below in units of seconds.
Exp1 = 3 ms to 10 s (at sub-array 129.99 µs to 10 s)
Exp2 = Exp1 × 10
The actual exposure time setting for Rapid Rolling Mode is defined by the following formula.
Exp1 = 1 ms to 10 s (at sub-array 40 µs to 10 s)
Exp2 = Exp1 × 10
Available setting range of the exposure time is the following.
Free running mode
Free running mode (at Sub-array)
External trigger mode
* 129.99 µs and 40 µs (Rapid Rolling Mode) for the Free running mode (at Sub-array) is
Note
the minimum exposure time when sub-array is set to 8 lines vertically symmetric (4 lines
in top half and 4 lines in bottom half) with respect to the horizontally center axis. The
minimum exposure time vary depend on vertical line number of sub-array setting.
22
32.4812 µs × Exp2
6
÷ 32.4812 µs (round up at decimal point)
10 µs × Exp2
6
÷ 10 µs (round up at decimal point)
3 ms to 10 s
1 ms to 10 s (Rapid Rolling Mode)
129.99 µs* to 10 s
40 µs* to 10 s (Rapid Rolling Mode)
3 ms to 10 s
1 ms to 10 s (Rapid Rolling Mode)