Operation of this module is very straightforward. The output
voltage can be varied continuously from 0 to approximately -1500V by the
multiturn control on the front panel (the module can be modified to give higher
voltages if required - please contact us for details). The output voltage is
displayed on the built-in meter. The unit is single-polarity, and the negative
output version is standard, but a positive output version can be supplied
instead if required. However, use of a negative supply is greatly to be
preferred. In this configuration, the photomultiplier cathode is at the
negative supply potential, and the anode is at or near ground potential. The
anode is best connected to a virtual ground, and this method of operation can
be selected for both our input amplifier and PMT amplifier modules.
The output of the supply appears on a high-voltage MHV (out) socket, which is superficially similar to a BNC connector, but these two connector types are NOT compatible. A matching cable for connection to the photomultiplier is included with the unit, and further plugs, sockets and cables are available from us if required. We would recommend leaving the power supply in the (off) position when not in use to avoid accidental damage to the equipment through over exposure to light. When setting up, or performing a new series of experiments, we would suggest turning the voltage potentiometer to a low level before switching on. For biological fluorescence measurements a value of between 700 to 1000 volts is usually best. When viewing paper during set-up procedures a much lower value (<600V) is often sufficient.
Please note that high voltages are potentially hazardous. For safety reasons, the module is enclosed in a metal case.
