142 PI-MAX/PI-MAX2 System Manual Version 5.F
Preamplifier Output Mode
PI-MAX detectors with the Thomson 512 × 512 chip have two auto-selected output
nodes. Node selection is done automatically from software depending on the A/D
converter speed. This allows performance to be optimized for a FAST converter (1 MHz)
or for a SLOW one (500 kHz or slower but with superior noise performance). This
feature enhances the PI-MAX’s ability to provide outstanding performance in a wide
variety of applications.
Note that the node selection reverses the direction of data readout. When Slow is
selected, data readout begins with the longer (red) wavelength pixels and progresses to
the shorter (blue) wavelengths. When Fast is selected, the shorter wavelength pixels are
read out first. In imaging, the effect is to reverse the image. These reversal effects are
automatically accommodated by the software and are transparent to the user. When the
image or spectrum is saved, the data will be in the order displayed at the computer.
Note: The order of the data at the ST-133’s Video Output connector will always
depend on the selected node. This reversal will be evident in the video monitor display
and cannot be accommodated. Again, as explained in the preceding paragraph, the
display at the computer is automatically corrected in software.
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