BSA Flow Software Installation and User's Guide - CSI

High voltage level: It sets the high voltage to the photo-multiplier. The
recommended starting level is around 1000 V. Depending on the size of the
particles, the laser power, the PDA optics and the position of the
measurement volume in the flow, the optimum may be higher or lower. For
optimum particle size measurements, you must have balanced signals, and an
optimum combination of high voltage and signal gain. For balancing, adjust
the high voltage of PDA2 and PDA3 till you get the same amplitude as
LDA1. When this is obtained, set the Balance high voltage to Yes. You can
now adjust the high voltage of all three channels using the LDA1 channel
only. The gain of PDA2 and PDA3 is automatically set to the same level as
LDA1.
Optimisation should take both the Sensitivityand the Signal gain into
account. The criterion may be the validation rate or the data rate or some
compromise between them, depending on the application. The validation rate
and data rate are displayed in the System monitor window.
Balance High Voltage: It frequently occurs that two photomultipliers of the same type require
different high voltage levels to generate the same signal amplitude. This is
due to sensitivity variations. Once the high voltage levels for all PMs have
been set accordingly, the Balance can be enabled to maintain the ratio.
5.3.3 BSA F/P 60 and 80 processors in Advanced User Interface Mode
Processor properties: General
The processor properties display depends on the selected User interface,
Normal or Advanced.
The properties for Analog input, Analog monitor, Synchronistion inputs
and output signals (only available if the options are installed and enabled)
are described in chapter 6.
5-14 BSA Flow Software: Project explorer objects