Imperx Cheetah C2880, User Manual

Page: 97 / 135

Cheetah KAC Camera User Manual | Camera Link (CLF) Interface
October 1, 2019 Page
97 of 135
Rev 7.2
5.8.2 Acquisition and Exposure Control
For each trigger input the user can set the trigger edge, and the de-bounce (de-glitch)
time.
1. “ Triggering Edge ” – the user can select the active triggering edge:
a. “ Rising ” – the rising edge will be used for triggering
b. “
Falling
” – the falling edge will be used for triggering
2. “ De-bounce ” – the trigger inputs are de-bounced to prevent multiple triggering
from ringing triggering pulses. The user has eight choices of de-bounce interval:
a. “ Off ” – no de-bounce (default)
b. “ 10 ” µ s, “ 50 ” µ s, “ 100 ” µ s, “ 500 ” µ s de-bounce interval
c. “ 1.0 ” ms, “ 5.0 ” ms, “ 10.0 ” ms de-bounce interval
3. “ Exposure Time ” – the exposure for all frames can be set in two ways:
a. “ Pulse Width ” – the trigger pulse width (duration) determines the
exposure subject to limitations. In GS mode, the minimum exposure is
about 6 micro-seconds. In RS mode, the minimum exposure is equal to
the minimum frame time.
b. “ Internal ” – the camera internal exposure register determines the
exposure.
1. The de-bounce interval MUST be smaller than the trigger pulse duration. Adjust
the interval accordingly.
2. When Triggering is enabled “Programmable Integration” is not active
5.8.3 Triggering Modes
A. Exposure Control
When Trigger mode is enabled, the trigger can be used to control the integration time of
Frame A or Frame B using the Exposure Control Trigger Pulse Width control. The trigger
can also be used to switch between Frame A to Frame B in dual video Trigger mode. The
Exposure Control Trigger Pulse Width option is only available when single video (either
Frame A or Frame B) is selected. Control of the exposure using the trigger pulse width is
not available in Dual Video or Dual Video Trigger modes.
GS Mode: When the trigger pulse width is used to control the exposure time in GS mode,
the camera idles and waits for a trigger signal. Upon receiving the trigger signal, the
camera starts integration for the frame, completes the integration and the image is
readout. There is small delay between the trigger active edge and the exposure start as
shown in the figure below. The exposure time can be set manually using the internal
exposure register setting by the duration of the trigger pulse as shown. The minimum
exposure time using the trigger pulse width is 2 micro-seconds. Upon completing the
readout, the trigger cycle is completed and the camera idles awaiting the next trigger
pulse.
RS Mode: With limitations, the exposure time can be controlled using trigger pulse width.
In this case, the minimum exposure time is equal to the time required to reset all of the