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20060825 report
CW and CCW inclinometry - both yield 'low-amplitude TY data
Inclinometry ws done as follows:
Datasets El Dirn HST mean leg temperatures Humidity
start start middle end %
( 20060821 89 cw 00:29 8.0 7.4 7.0 --
20060822 89 cw 18:00 - - - --
20060824 89 ccw 04:00 8.1 7.5 7.1 -- )
20060825 89 cw 01:00 6.7 6.4 6.2 --
20060825 89 ccw 04:00 6.2 6.1 6.0 --
The datafiles are given UT-derived names.
Data is recorded from the 3 active inclinometers only:
there is no strain gauge data, for instance.
The raw data from channels 1,4,7 (X-axes), 2,5,8 (Y-axes) and 3,6,9
(temperatures) are shown below for the CW run:
Click on image for better view
. . and for the CCW run:
Click on image for better view
The TY data are of the 'low-amplitude' variety seen in the CW run of
yesterday rather than the
normal variety seen in the CW run
on the 23rd and previously -
i.e. in and before January 2006:
It's actually not useful to describe these data as 'low-amplitude' :
they do not even resemble the older data in profile, with
more anti-correlation of features, if anything.
The setting of the
'Filter'
switches on the 'TMU' inclinometer in the receiver cabin was checked
before these most recent runs.
Noise levels from CW/CCW turnaround
The CW & CCW data have been taken in one 6-hour long session.
The az_file used contains several (8) requests for data at az=439.09,
which is the last point of the CW sequence and the first of the CCW
sequence. We can use the extra six data to estimate noise levels
in each channel :
Channel 1 2 3 4 5 6 7 8 9
Axis TX TY TT LX LY LT LX LY LT
Noise (s.d. of 6) 0.7 3.4 0.05 0.4 2.7 0.05 0.7 1.2 0.05 mV
(Recall: 1mV = 0.05" for channels 1,2,4,5,7,8 and 1mV=0.1degC for channels
3,6,9)
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