Continuing work on getting the diagnostic breadboard (DBB) up, at least as far as the front end laser is concerned.

    Frequency noise: Looks pretty good actually.  A factor of a couple above the reference trace for frequencies between 2 and
5 Hz.  Below or equal to elsewhere.  Control and error signals are consistent with the reference traces.

    Beam pointing: Clearly something is not quite right with this measurement.  Could well be that the alignment onto the two
quadrant photodetectors needs to be checked.

    Relative power noise: First measurement done with the DBB PMC locked.  Typically a factor of ~2 higher than the reference
trace, across the board.  Not too dissimilar to the measurement made on Tuesday.  dbb_rpn-001.pdf is with the PMC locked, dbb_rpn-002.pdf
is with the PMC unlocked.  One can see a small difference in the 7 to 13 Hz region, nothing to worry about really.  I was interested
to see if there was a difference in the first place.

    Mode scan: Measurement is consistent with that conducted on Monday, namely ~3% in higher order modes.

    ISS relative power noise: This measurement does not require the DBB but does need the "real" pre-modecleaner to be locked.
Note that the alignment into the PMC is not optimised because the Picomotor controller was moved for the work around HAMs [1-3].
There's a large discrepancy between the in and out of loop sensor.  That's not too surprising, although the scale of the difference is.
The ISS MEDM screen indicates that PDB is the out of loop sensor, which corresponds to the blue trace.