CM-030GE-RH
25
Programmable Exposure (PE)
The exposure time can be programmed in 16.24µs (LVAL period) increments. The range is
from 2 LVAL to 511 LVAL.
Minimum exposure time 2L
Maximum exposure time 511L
16.24 µs x 2(L) = 32.48 µs
16.24 µs x 511 (L) ≈ 8.299 ms
In binning mode:
Minimum Exposure time 2L
Maximum exposure time 257L
20.069 µs x 2(L) = 40.138 µs
20.069 µs x 257 (L) ≈ 5.158 ms
Exposure Time Abs
This is a function specified in the GenICam standard.
The shutter speed can be entered as an absolute exposure time in microseconds (μs) in
register address 0xA018. The entered absolute time (Time Abs) is then converted to a
programmable exposure (PE) value inside the camera.
The equations below show the relationship between the PE value used by the camera for the
different readout modes and the "Exposure Time Abs" value entered in register 0xA018.
Due to rounding (decimals rounded down), some discrepancies may occur.
The relation between PE value and Time Abs:
Normal readout PE= 2 + INT
(1)
(Exposure time -32.5) µs / (942
(2)
/58000000
(3)
)
V Binning readout PE= 2 + INT (Exposure time -40.1) µs / (1164/58000000)
Note: (1) INT means integer (rounded down). (2) Pixel clocks/line. (3) Pixel clock
GPIO in combination with Pulse Width Trigger
More precise exposure time can be obtained by using the GPIO module in combination with
Pulse Width Trigger mode. The clock generator and counter can be programmed in very fine
increments. For an example, refer to
6.5.1 GPIO Plus PWC shutter
Upper limit and lower limit of exposure time in each read out mode.
Lower
limit
Upper limit
µs
Line
Normal
32.5µs
8299µs
511L
2/3 Partial
32.5µs
5814µs
358L
1/2 Partial
32.5µs
4677µs
288L
1/4 Partial
32.5µs
2907µs
179L
1/8Partial
32.5µs
2046µs
126L
V Binning
40.1µs
5158µs
257L