User manual

Rolera Thunder User Manual 17
Rolera Thunder
Features
The Rolera Thunder has incorporated a calibration routine which allows the camera to adjust
voltages of the ADC offsets such that the electron multiplication gain input given to the camera
reflects the actual gain provided by the device. Settings 1 to 1000 on the electron multiplication
gain slider are mapped linearly to provide the actual multiplication gain requested by the user.
Due to the impact-ionization method used with the electron-multiplication gain register the
actual gain realized by the detector with time will slowly be reduced. By using the calibration
routine the camera is able to re-establish the electron multiplication gain slider such that it will
provide the gain which is input on the gain slider. This ensures the quantitative nature of the
camera over time. Even though the camera is capable of delivering large multiplication gain
factors, multiplication gain should only be used as needed to preserve as much dynamic range as
necessary and to prolong the device’s lifetime.
Figure 17. DAC Setting vs. Charge Multiplication Gain for Rolera Thunder
Multiplication Gain vs Slider Value
4
-200
0
200
400
600
800
1000
1200
1400
1600
1 101 201 301 401 501 601 701 801 901
DAC Value
M u ltip lic a tio n G ain (X )