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16 PI-SCX System Manual Version 2.E
16
connected to the Peltier. CCD temperature is controlled and monitored by the host
computer and the ST-133 Controller.
Electronics: The camera electronics enclosure contains the preamplifier and array
driver board. This design keeps all signal leads to the preamplifier as short as possible
and also provides complete RF shielding.
Speed of data acquisition and dynamic range is determined primarily by the A/D converter
used (binning on the array is also a factor). The PI-SCX is available with a 1 MHz, 16-bit
readout. The PI-SCX:1300 is available with dual-speed digitization (100 kHz and 1 MHz).
These 16-bit digitizers give you the choice of the 100 kHz for the better signal-to-noise ratio
or the 1 MHz for increased data acquisition speed. Both the PI-SCX:1300 and the
PI-SCX:4300 have dual-amplifier circuits (low-noise or high-capacity). The PI-SCX:4096
has a single readout-amplifier.
Connectors: Power, control signals, and data are transmitted between the ST-133 and the
PI-SCX camera via the 25-pin D connector located on the rear of the camera.
Mounting Holes: The PI-SCX:1300 camera can be ordered with an optional tripod
mount kit with three different mounting holes (1/4"-20, 3/8"-16, and M6). The
PI-SCX:4096 and the PI-SCX:4300 cameras have three threaded holes on the underside
of the camera body (two are M8 x 1.25 tap, 25 mm deep; and one is 1/4"-20 tap, .50"
deep).
Fan: PI-SCX:1300 only. There may be a fan located inside the camera's back panel. Its
purpose is:
to remove heat from the Peltier device that cools the CCD array
to cool the electronics.
An internal Peltier device directly cools the cold finger on which the CCD is
mounted. The heat produced by the Peltier device is then removed by the air
drawn into the camera by the internal fan and exhausted through the back panel.
The fan is always in operation and air cooling of both the Peltier and the internal
electronics takes place continuously. The fan is designed for low-vibration and
does not adversely affect the image. For the fan to function properly, free
circulation must be maintained between the rear of the camera and the laboratory
atmosphere.
Coolant Ports: Depending on the camera, there may be two coolant ports for water-
cooling. The Inlet and Outlet ports for the PI-SCX:4096 and the PI-SCX:4300 are
interchangeable, are barbed (straight or right-angled), and will accommodate 3/8" ID
Tygon tubing . Optimal cooling for the PI-SCX:1300 requires that the correct ports be
used for the Inlet and the Outlet. These quick-disconnect ports require 1/4" thin-wall
plastic tubing.