BSA Flow Software Installation and User's Guide - CSI

Calibration (PDA only)
The calibration is carried out for PDA measurements only.
The electronics generates a phase offset that requires to be compensated.
This is done by the mean of a calibration.
A phase calibration unit supplies a calibration signal that is used to
determine hardware generated phase-shift offsets. The calibration signal is
provided by an LED (shutter closed in the receiver) and signals are measured
directly by the PM’s.
In Automatic mode (default mode), a calibration is carried out when one of
the following parameters of group 1 (LDA1, PDA2 and PDA3 channels in
FiberPDA mode or 1 LDA1, PDA2 and LDA4 PDA3 in DualPDA mode) is
modified:
• Velocity span
• Center velocity
• Gain
• Sensitivity
• Every 15 minutes
The phase calibration can be made automatically whenever needed, always
before acquiring or never. Go in the processor properties, select general
and click on calibration mode (see chapter 5.3).
Note Disabling the calibration might affect the phase measurement and might
give some incorrect results.
BSA
Figure 4-38: processor properties and calibration mode.
Now select Processor, and click the Auto button. This starts the Autoconfiguration
wizard, which guides you through the procedure for
establishing a connection between the BSA and the PC.
In the second step of the wizard, you should obtain a window similar to this:
4-38 BSA Flow Software: The user interface