Camera interfaces
190
Manta Technical Manual V7.9.0
Trigger definitions
Trigger rules
•
The user trigger pulse width should be at least 6
μ
s.
•
The
end of exposure will always trigger the next readout.
•
The end of exposure must always end after the current readout.
•
The start of exposure must always correspond with the interline time if
readout is true.
•
Exposure start delay equals the readout time minus the registered exposure
Time.
Triggering during the Idle State
For applications requiring the shortest possible trigger latency and the smallest
possible trigger jitter the user trigger signal should be applied when imaging is
false and idle is true.
Term
Definition
User trigger
Trigger signal applied by the user (hardware trigger, software trigger).
Logic trigger
Trigger signal seen by the camera internal logic (not visible to the user).
Tpd
Propagation delay (
t
pd
) between the user trigger and the logic trigger.
Exposure time
High when the camera image sensor is integrating light.
Readout
High when the camera image sensor is reading out data.
Trigger latency
Time delay between the user trigger and the start of exposure.
Trigger jitter
Error in the trigger latency time.
Trigger ready
Indicates to the user that the camera will accept the next trigger.
Registered exposure time
Exposure time value currently stored in the camera memory.
Exposure start delay
Registered exposure time subtracted from the readout time and indicates
when the next exposure cycle can begin such that the exposure will end
after the current readout.
Interline time
Time between sensor row readout cycles.
Imaging
High when the camera image sensor is either:
•
exposing
•
exposing and reading out data
•
reading out data
Idle
High if the camera image sensor is not exposing and/or reading out data.
Table 86: Trigger definitions
