- 465: BAROMETERS , Site none, Fri 26-Oct-1990 19:04:00 GMT, Replaced new barometer #0002 with #0001
Replaced new barometer #0002 with #0001
at ~18:53. Tony and I were at the towers
from ~18:45 - ~19:00.
- 474: BAROMETERS , Site none, Sat 27-Oct-1990 23:15:35 GMT, New PAM barometer boards installed.
New PAM barometer boards installed.
See entry #472 for most details. Here I wanted to mention that the tubing going
down from the 7m port to the transducer at 4m was wrapped around one leg of the mast,
so it should be relatively vibration-free. Also, I am not sure which of the ports
is which (and therefore which one is 7m). The 7m port is connected to the transducer
closest to the edge of the board. I'll look at the data to see which one this appears
to be.
- 522: BAROMETERS , Site none, Thu 01-Nov-1990 20:13:22 GMT, NEW BAROMETER - 4m
NEW BAROMETER - 4m
From 19:40 to 20:00 GMT, Steve and
Cathy were at the ati tower trying to talk
to the new barometer. All the cables checked out
ok. The sensor was pulled from the box to be
checked in the lab. Because of the tie connections
from the old barometers to the new, pressure
values at the 4m and 7m levels should be considered
bad until the new barometer is reconnected. Look
at future logbook messages stating when pressure
data is good again.
- 524: BAROMETERS , Site none, Thu 01-Nov-1990 21:39:50 GMT, NEW BAROMETERS
NEW BAROMETERS
The new barometers are now running
at 1 sec. data rates. The 4m sensor was installed
and looks good. This took place at 21:30 GMT.
- 552: BAROMETERS , Site none, Tue 06-Nov-1990 01:06:55 GMT, New PAM barometers apparently stopped r
New PAM barometers apparently stopped running
when marigold stopped at 21:39 on JD 308.
Charlie restarted them by recycling their
power at 00:45 JD 310.
- 561: BAROMETERS , Site none, Wed 07-Nov-1990 01:33:49 GMT, New PAM barometers stopped again at ~12
New PAM barometers stopped again at ~12:38
JD 310.
- 565: BAROMETERS , Site none, Wed 07-Nov-1990 18:07:27 GMT, Recycled power on new PAM barometers at
Recycled power on new PAM barometers at
16:16 in order to initiate archiving.
Data are being archived, but the data
file has JD 310 rather than JD 311:
aster:/home/aster/raw_data>ls -l ati/pam_new.bar*
248240 Nov 7 18:00 ati/pam_new.bar#310#16:16:25
0 Nov 7 18:00 ati/pam_new.bar#311#18:00:00
I renamed the file pam_new.bar#310#16:16:25 to
pam_new.bar#311#16:16:25.
- 639: BAROMETERS , Site none, Fri 16-Nov-1990 19:51:49 GMT, Al was here!
Al was here!
First test (~10:00 local) was to insert resisters (a dummy load) into Al's box at 4m -
this added about 480 microbars to the signal and had noise on the order
of 10^-9 (in power), which looked white.
Next test (~10:30 local) was to insert dummy loads into the boxes at 7m and 13m. Both
of these threw the balance offscale (<-5V), so Steve S. changed the jumpers on the
filter board to make a gain of 1/2 about 10 min. after the loads were inserted.
It was obvious from this test that the 4m had more noise, which looked like aliasing
of a high (>10 Hz) signal.
Final test (~12:30 - after Al left) was to move the analog cable from the 4m box away
from all other cabling (including power). The noise on the 4m signal is now much
less than the one at 7m. WE SHOULD HAVE DONE THIS TEST LONG AGO!!! Al thinks that
the noise is still low enough that it won't effect unstable data (or even stable
data in moderate (>3 m/s) winds), but it would have been nice. Oh well...