DQRID : D010201.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
01/17/2001060001/22/20012145Suspect
more
Subject:
NSA/MWR/C1 - Temperature Stabilization of Noise Diode Impaired
DataStreams:nsamwrlosC1.b1, nsa5mwravgC1.c1, nsamwrlosC1.a1
Description:
On 1/17 we had a big spike in the data and lost temperature stabilization. The instrument 
had problems maintaining the Noise Diode (ND) temperature since. At ambient temperatures 
under about -20 C the ND was not maintaining the set temperature of 30 C. This problem 
was reported in P010122.1.

Fred Solheim recommended on 1/22 that we powercycle the instrument as it looked like the 
instrument CPU had lost the temperature reference.

So we powercycled the instrument on 1/22 @ 20:30 and lost all comumnication to it; after a 
second powercycling the instrument came back on line and the temperature stabilized 
quickly (within a couple of minutes) to the set temperature (30 C)

Fred Solheim reported after the system was restored:
"I've never seen this behavior before. I don't think it was due to the RF deck physically 
hanging temperature, because the recorded temp dropped about 30 C in one observation 
cycle. If this happens again, send the MWR down along with data files for us to look at."

Data collected in the periode 1/17/2001 6:00 to 1/22/2001 21:45 are questionable since it 
is uncertain whether the temperature really was unstable and what really caused the 
problem.
Suggestions: 
Measurements:nsamwrlosC1.a1:
  • tbsky23
  • tkbb
  • tc23
  • tc31
  • sky31
  • bb23
  • bbn23
  • tnd23
  • tnd_nom31
  • tkair
  • tbsky31
  • bb31
  • liq
  • sky23
  • ir_temp
  • tnd_nom23
  • tknd
  • bbn31
  • vap
  • tkxc
  • wet_window
  • tnd31
more
nsa5mwravgC1.c1:
  • num_obs
  • ir_temp
  • tbsky31
  • vap_sdev
  • liq_sdev
  • tbsky23
  • vap
  • ir_temp_sdev
  • num_obs_irt
  • liq
  • water_flag_fraction
  • tbsky31_sdev
  • tbsky23_sdev
more
nsamwrlosC1.b1:
  • liq
  • tbsky31
  • vap
  • tbsky23
  • wet_window
  • ir_temp
more

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