====== Cleaning 2D-C Prisms ======
  -Unscrew the end caps.
  -Use allen wrench to unscrew the prisms from the probe arms.
    *{{:atmos:citation:instruments:2dc:two_dc_screw.jpg?500|}}
  -Slide heater and prism assembly out of probe arms.
    *{{:atmos:citation:instruments:2dc:two_dc_prisms.jpg?500|}}
    *In the right-hand probe arm, the holes for the hex screw can be seen in both the prism assembly and the probe arm.
  -Clean the prisms with isopropyl alcohol.
  -Insert the heater and prism assembly back into probe arms.
  -Make sure the set screw is set correctly.
  -Screw the end caps back on.
  -Clean the prism above the image diodes inside the 2D-C with isopropyl alcohol.
    *{{:atmos:citation:instruments:2dc:two_dc_inprism.jpg?500|}}
    *The prism can just be seen under the crossbar in this picture above the image diodes.
  -When done cleaning prisms, verify that the end element voltages for both end are over 2V by attaching a voltmeter as demonstrated in the picture below.  Make sure that on one side of the probe, the dial is set to 1 and for the other the dial is set to 32.
    *{{:atmos:citation:instruments:2dc:two_dc_endelements.jpg?500|}}