Instruction manual

Guppy Technical ManualV7.4.0
155
Controlling image capture
Exposure time (shutter) and offset
The exposure (shutter) time for continuous mode and Trigger_Mode_0 is based
on the following formula:
Shutter register value x timebase + offset
The register value is the value set in the corresponding IIDC register (SHUTTER
[81Ch]). This number is in the range between 1 and 4095.
The shutter register value is multiplied by the time base register value (see Table
110: Time base ID on page 237). The default value here is set to 20 μs.
Exposure time of Guppy F-036 (CMOS)
The CMOS sensor of Guppy F-036 enables shutter times in integer multiples of
the row time (29.89 μs).
Exposure time of Guppy F-503 (CMOS)
The row time of Guppy F-503 depends on the shutter mode.
Guppy F-503 row time for global reset release shutter (GRR)
In global reset release shutter the formula for the row time is:
The minimum row time and the row time by maximum resolution are:
Guppy F-503 row time for electronic rolling shutter (ERS)
In electronic rolling shutter the exposure time is independent from row time and
is set via Extended shutter advanced register with μs precision.
For more information see Chapter Extended shutter on page 238 and Table 111:
Advanced register: Extended shutter on page 238.
Note

Although you can enter shutter register values as usual, the
camera will round down to integer multiples of the row time.
Formula 6: Row time for Guppy F-503 (CMOS): GRR
Formula 7: Min. row time and row time by max. resolution for Guppy F-503 (CMOS): GRR
t
row
11.97ns width 10.77μs+=
t
row min
11.63μs=
t
row max res
41.80μs=