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.
Notes:
2013
- started plotting the bias voltages and currents for all
receivers.
- 26sep-03oct13 . no data
- rfi cpu crashed 26sep13.
- when restarted, the daynum in file were being recorded
incorrectly. Restarted 03oct13. things ok.
2008
08mar04 - cbh now included in plots.
jun09 - cbh dropped, 800Mhz
receiver monitored
08aug09 - sbh dropped cbh now monitored
2003
13jan03- lbn dewar warmed up for maintenance. xband 16K stage
drops by 5K since now 2 rather than 3 dewars on the compressor.
15jan03- lbn op-amp for tempmonitor conversion I to V added
bypass capacitors. Drifting should settle down..
16jan03- xb,sbn,lbn 1 compressor changed to (xb,sbh)
(sbn,lbn)
26mar03 - xb,sbn,lbn back to 1 compresso sbh on 1
by itself.
04apr03 - lbn changed diode monitoring circuit to use old diode
curve.
07apr03 - changed sbn diode board to use old diode
curve..updated software
2002
18feb02 xb - xband moved to share compressor with sbn,lbn. 16K
stage jumped a few degrees.
06apr02 lbw- left vacuum pump running on dewar. 70K
120->80K. must be a leak in dewar.
27jun02 lbw - warmed up lbw, regreased seals, added vacion pump
(but not on yet), then cooled down.
10jul02 lbw - turned on vacion pump.
17sep02 lbn,xb - sbn no longer on compressor with xb,lbn (down
for repairs). xb,lbn temps decreased.
24sep02 lbn,xb,sbn back to being on same compressor.
20dec02 switched to use continous sampling. last5 plots sampled
every 22 secs, last_30 plots smoothed to 4 minutes.
processing: x101/dwtemp/dwtemp.pro
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