Instructions for Phasing up the Data-System's Demodulation
It will be assumed that the reader knows how to phase up a lock-in
Setting the phase of the data-system's demodulation can be tricky.
The status/control window
in the "sparo" program (running on the Mac called "gnu")
is where the phase is usually set.
Unfortunately, the convenient little
buttons that allow one to change phase by 180 deg. or 90 deg. do *not*
affect the phase that is displayed in the status/control window. However,
they *do* affect the actual phase used for the lock-in demodulation.
To see the value of the actual phase (that is used for the data-system's
one has to open up the "phases" window and then furthermore, one has to set the
display mode in this window to "numbers" rather than the graphical display.
The display mode is set by clicking on one of two little buttons that lie within
that phase window.
The phase is also saved to data file, as is the quadrature data. So the
phase can be checked "after the fact".