Data Quality Reports for Session: 108390 User: osatya Completed: 10/15/2007


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D070201.1TWP/VCEIL/C3 - Reduced sensitivity to high cloudstwpvceil25kC3.b1


DQRID : D070201.1
Start DateStart TimeEnd DateEnd Time
12/20/2006040101/12/20070120
Subject:
TWP/VCEIL/C3 - Reduced sensitivity to high clouds
DataStreams:twpvceil25kC3.b1
Description:
The instrument produced a significant number of optical cross-talk warnings and displayed 
a reduced capacity to detect high clouds.  The internal cables were inspected, the 
compensation fiber and optics monitor were replaced, the crosstalk compensation was adjusted, 
and the system tested with an optical termination hood, all with no improvement.  While 
waiting for a new receiver board, receiver ribbon cable, and compensation fiber cable from 
Vaisala, a spare ceilometer with a standard, "non-tropics", window was installed.
Measurements:twpvceil25kC3.b1:
  • Second lowest cloud base height(second_cbh)
  • Third cloud base height(third_cbh)
  • Percentage of nominal factory setting (0 to 999%)(receiver_sensitivity)
  • Altitude of highest signal(alt_highest_signal)
  • Detection status. See details(detection_status)


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