[evlatests] Mislabeled scan?

[Walter Brisken]

It appears the executor goofed somehow.  I see two consecutive observation 
documents that arrive in the wrong order:

<Observation seq="5970" startTime="54572.59076118564" 
subarrayId="293XPOL.54572.586997743056"><name>1800+784</name><ra>4.71571120734366</ra><dec>1.36952116621192</dec><startLST>0.8615126553777372</startLST><intent>stopLST=0.86359598</intent><intent>FreqVelSwitch="FFFF"</intent><intent>FluxDensity=2.85000000</intent><intent>ObsCode="XPOL 
"</intent><intent>BandwidthCode="2222"</intent><intent>CalibratorCode="A"</ 
intent><state>0</state><sslo BWcode="34" FEfilter="0" IFid="AC" 
Receiver="10GHz"><freq>8441.35</freq></sslo><sslo BWcode="34" FEfilter="0" 
IFid="BD" Receiver="10GHz"><freq>8491.35</freq></sslo></Observation>

<Observation seq="5971" startTime="54572.588854166665" 
subarrayId="293XPOL.54572.586997743056"><name>1800+760</name><ra>4.71238898038469</ra><dec>1.32645023151569</dec><startLST>0.8596004151768284</startLST><intent>stopLST=0.86151266</intent><intent>FreqVelSwitch="FFFF"</intent><intent>ObsCode="XPOL 
"</intent><intent>BandwidthCode="2222"</intent><state>0</state><sslo 
BWcode="34" FEfilter="0" IFid="AC" 
Receiver="10GHz"><freq>8441.35</freq></sslo><sslo BWcode="34" FEfilter="0" 
IFid="BD" Receiver="10GHz"><freq>8491.35</freq></sslo></Observation>

IDCAF can work around some of these situations, but once a scan stop-time 
has been set (ie, for the first of these two scans) it will not inturrupt 
that scan until a scan with a later start time is encountered.

Note that something similar appears to have happened a bit earlier too, 
with scans starting at MJD 54572.584528265645 and 54572.5784375 .

-Walter

On Wed, 16 Apr 2008, Rick Perley wrote:

>    We're continuing tests on the sensitivity problem seen in spectral
> line modes.
>
>    The latest test involves x-band observations, in various modes.
> Each mode is observed on a calibrator, then on a blank field, at X-band.
>
>    In data taken this morning, for mode PA with 12.5 MHz BW, the 'blank
> field' observation has only a single record.  The missing data are found
> in the following mode -- PB with 12.5 MHz BW, at the same frequency.
> This might be a mislabeled scan, or a mistaken command by the
> correlator.  Can somebody check this out?
>
>    The IAT time for the mode PA data is 14:05:28 through 14:11:12.
>    The IAT time for the mode PB data is 14:11:18 through 14:17:12.
>
>    The apparently mislabelled scan runs from 14:08:35 through 14:11:12.
>
>    Thanks!
>
>    Rick
> _______________________________________________
> evlatests mailing list
> evlatests at listmgr.cv.nrao.edu
> http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests
>