The photon counting detector, a Photomultiplier Tube (PMT), is mounted
in a box and can be
illuminated by a red LED (Light Emitting Diodes). Turn the knob labeled
"LED" clockwise to increase the LED light level.
Power = +12 V
The small blue box amplifies pulses from the anode of the
photomultiplier before they are fed to
Pulsed LED (not currently
Connect a TTL (5 volt) pulse to the BNC connector on the
back of the demo unit to adjust the second LED inside the box.
The level of the pulsed-LED is controlled by the knob labeled "PULSED
Before opening this box put, disconnect the power.