The past 200 days of maser channel data is quite a mess so to begin with let's have a look at just two days. I had not plotted maser channel data for many months (it's too much manual work) but maser performance was poor this week and I thought I should take a look at all the channel data.
As expected there are significant environmental temperature effects. No wonder the maser is having trouble getting down to the low 15's. The maser actually performed better for some tau last year when there was no HVAC at all.
Blindly plotting all channels together gives the following chart.
Of all the channels it turns out ten of them clearly show temperature effects. Of these 5 show large variations and 5 show small variations.
All the big wiggles follow periodic changes in lab temperature. The lab is still experiencing several degree changes as the A/C turns on and off.
The remainder of the channels pictured below vary much less.
Below is a close-up of the lower half of the plot.
Two more close-up plots. IF and REG move as mirror images of all the other plots.
and lastly, showing IF and CAV more clearly:
At the same scale the remaining 5 channels appear as almost flat lines. However, zooming in shows temperature effects.
The following is a plot of lab air temperature during the same two days:
In this case, the A/C was on continuously except for twice a day. A broader view, covering two weeks before this 2-day period is visible below. On many days the A/C is behaving as one would expect - many short on/off cycles:
Tom,
Answers inserted below. The errors you point out are due
to changes in circuit monitor points without changing the EPROM
program. At the time, we were focused on the new microprocessor
design. Sorry for the confusion.
Thanks,
HBO
|
22-Mar-2004