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: http://www.naic.edu/~phil/dwtemp/dewartemps.html
Дата изменения: Sat Jan 9 00:40:31 2016
Дата индексирования: Sun Apr 10 04:49:59 2016
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Dewar temperatures and bias voltages/currents
march,2002
dewar
temperatures
dewar bias
currents and voltages
Dewar temperatures:
The receiver systems have temperature sensors that
measure the physical temperature of the 16 Kelvin, 70 Kelvin, and
the OMT stages of the receiver. These temperatures are recorded
daily. They are plotted below by year and for the last 5 and 30 days
(updated at 5:25 am each day). The color plots overplot all of the
receivers on one plot using color to differentiate between the
receviers. The black and white plots have a mosaic with 1 plot per
receiver (if you don't have a color plotter, then you can make
hardcopy with the black and white version). Some receivers do not
have the temperature diodes to measure the 70K or the OMT stages.
These plots will appear blank. See using
idl
to plot the dewar temperatures for routines that allow you to
plot this data interactively.
Dewar bias voltages and currents
The dewar monitoring system includes
monitoring of the bias voltages and currents for each stage of the
amplifiers. The data is recorded (all receivers are read about
once every 30 seconds) and written to discs. Plots are made
daily (at 5:25am) of: the last 5 days, the last 30 days, and
the year to date.
The plots contain:
- Each receiver has their own set of plots for a time period
(5days,30days, yeartodate).
- the 5day data has the full time resolution. the 30day and year
to date are smoothed to 1 hour resolution.
- For each dataset, the bias currents are on the first page and
the voltages are on the second page.
- On a given page, the stages are plotted in different frames
(stage 1 is at the top).
- Pol A values are plotted in black. polB is plotted in red.
- The vertical scale for each plot is a fixed value. If the
trace hits the top, or bottom of the plot then it just means
it's the plotted scale.
- All plots are pdf files.