Various mounting configurations available including female C-mount threads and a flat flange mount with two 3mm bolt holes 32mm apart.
Attach the PMT to the port on your instrument. Avoid exposure of the PMT photo-cathode to intense light even when no power is applied.
Attach the cable from the PMT head to the PMT module in the control box.
Attach a coaxial cable from the OUT BNC connector on the PMT module to your data acquisition system or oscilloscope.
Before powering up the control box, be sure the PMT gain setting knob is turned all the way down. This will help prevent inadvertent over-current of the PMT.
WARNING: The Photo-multiplier tube can be damaged by over-current and by over-exposure to intense light. Expose the PMT to only subdued lighting conditions and avoid over-exposure. The over-exposure limit on the controller will not protect the tube from sudden high intensity over-current situations.
Gain Switch: The gain switch allows for either remote or manual control of the PMT gain. In the up position, the gain is set by the 10-turn front panel potentiometer. In the down position, the voltage on the BNC connector located directly below the switch sets the PMT gain.
Gain Potentiometer: This potentiometer controls the high voltage on the PMT tube, and hence, the tube gain. Start with the knob at 0.0 and increase the gain until a satisfactory signal is obtained. It is not recommended that you never go above 9.0 for more than a few seconds unless you're in a photon counting environment. Typical maximum setting should be 8.0.
Gain BNC Input: With the gain switch down, the control voltage for the PMT comes from the front panel BNC. If you choose to use this input to remotely control the PMT gain, be sure that the control voltage never exceeds 4.5 Volts. Inadvertent high gain on the tube can potentially cause damage. 5 volts on the BNC corresponds to 10.0 on the gain potentiometer.
OUT BNC Connector: The PMT puts out a 0-10 Vdc signal. The absolute maximum output voltage must be kept less that 10 volts to prevent damage to the tube.
O/L Warning Light: If the O/L LED comes on, this means that the PMT output signal exceeded a preset voltage (Set to 8 volts at the factory). The gain control voltage is set to zero in this state. This will cause the internal high voltage multiplier in the PMT head to turn off, thereby protecting the tube from further damage. However, there is a delay of 1or 2 seconds before the voltage on the tube is reduced, during which time the tube is still subject to overexposure damage.
R/S Button: Pressing the R/S button resets the overexposure circuit and allows gain control voltage to be applied to the PMT head again.
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