Cheetah Python Cameras User Manual | CoaXPress (CXP) Interface
August 27, 2019
Page
67
of
86
Rev 1.0
Strobes
The camera can provide up to two strobe pulses for synchronization with an external light
source, additional cameras, or other peripheral devices. You can set each strobe’s pulse
delay and duration with respect to the start of the exposure period or the start of the
readout period. You can set the maximum pulse duration and the maximum delay up to
1 second with 1.0
µ
s of precision. You can assign the strobe pulse to either of the external
outputs. The following graphic shows strobe signals positioned with respect to the start of
exposure.
Figure 42:
Strobe positioning with respect to exposure start
Video Amplifier Gain and Offset
Analog Gain
The cameras provide 1x (0 dB), 1.26x (2.0 dB), 1.87x (5.43 dB), and 3.17 (10.0 dB) analog
gain. Always apply analog gain before applying digital gain.
Digital Gain
Digital gain can be varied from 1x (0 dB) to 15.9x (24 dB) with a precision of ~0.00097x using
the raw (fine) gain control. There are 15,360 gain steps from 1x gain to 15.9x gain. Each step
increases the gain by 0.000969932x or 1/1031 from 1024 (1.0x gain) to 16384 (15.9x gain).
Digital Gain does not provide any improved contrast and should be used cautiously.
To determine the gain step when the gain value is known, use the following steps:
1.
Subtract 1.0 from the desired gain multiplier (e.g. 2.54x gain).
2.
Multiply the result by 1031.
3.
Add 1024.
Or use this formula:
Gain coefficient = [[Desired gain – 1] *1031] +1024.
If the desired gain is in dB, use the following formula:
Gain coefficient = [[[anti-log
10
(Desired gain (dB)/20)]-1]*1031]+1024.
