[evlatests] Tsys Logging

[Rick Perley]

Bryan is correct.  I re-filled the data, selecting the time range to 
cover only the fast-dump test.  All proper Tsys values are present at 
the expected rate. 
Apparently, FILLM was set up for 10 second Tsys values by the initial 
'dummy' scan, preceding the referenced pointing. 



Bryan Butler wrote:
>
> the Tsys data will be "logged" at every integration interval - they 
> are in the archive records at whatever interval the visibilities are 
> recorded at.  this might be an odd interaction between FILLM and the 
> archive, for datasets with mixed integration lengths.
>
>     -bryan
>
>
> On 8/2/07 13:18, Rick Perley wrote:
>>     All 27 antennas worked very well.
>>     But a remarkable 'feature' in the TY table was discovered:
>>
>>     The X-band observations were set up in a special way, to avoid a 
>> known 'feature':  It seems that the scan which *precedes* a reference 
>> pointing scan will always fail to give any data.  Ken says this is a 
>> known problem, which will be repaired soon.
>>     In my 'stress test', I run a 'reference pointing' at X-band.  To 
>> avoid wiping out the preceding C-band observation, a 'dummy' X-band 
>> observation was inserted between the C-band and the X-band reference 
>> pointing.  This 'dummy' scan requested 10 second integration.  The 
>> reference pointing also used 10 second integrations, while the real 
>> X-band on-source observation (which followed the referenced pointing) 
>> used 0.416 second averaging.
>>
>>     The visibility data were exactly as expected.  However, when I 
>> went to review the Tsys data (in the TY table), I found to my 
>> amazement that the data were logged only once every 10 seconds (which 
>> is the interval set by the preceding two scans, at this band).
>>     Looking ahead (U-band), all rates, in both visibility and 
>> monitors, were at the requested 0.416 second rate.
>>     Why were the Tsys data only logged once per 10 seconds?
>>
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