CHEETAH Hardware User’s Manual
Imperx, Inc.
Rev. 6.2
6421 Congress Ave.
7/7/2015
Boca Raton, FL 33487
+1 (561) 989-0006
47 of 152
1.
“
Triggering Edge
” – the user can select the active triggering edge:
-
“
Rising
” – the rising edge will be used for triggering
-
“
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:
-
“
Off
” – no de-bounce (default)
-
“
10
”
s, “
50
”
s, “
100
”
s, “
500
”
s de-bounce interval
-
“
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:
-
“
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.
-
“
Internal
” – the camera internal exposure register determines the exposure.
CAUTION NOTE
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
2.8.3 Triggering modes
A.
Exposure Control
When Trigger mode is enabled, the trigger can be used to control the integration
time of Frame A and / 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 as shown in Figure 2.6a or set by the