[evlatests] tests, June 12

[Pete Whiteis]

I think I may know what the issue is here. The MIB flags an el/az 
position error if the deviation from commanded position is too large for 
over one second. Ditto for the CMP. However, when the antennas are on 
source and the deviation error goes away, the MIB clears the position 
alert within 1 second. The CMP however, will not clear the deviation 
error for *25* seconds. I'm not sure why this difference exists, but it 
seems like we should make the alert behaviour match for the two systems. 
The question is, which is correct, MIB or CMP?

-Pete-

Barry Clark wrote:

>>2.  I spent some time looking at flagging of VLA antennas while
>>doing pointing at X band to see how the ACU position alerts are
>>behaving.  The answer is not well.  The response is not quick
>>enough, especially on the side of lifting the alert.  Two of the
>>measurements were erroneously flagged in every pointing trial
>>I examined.  EVLA antennas were perfectly fine.  Not all moves
>>were flagged, but when a move was flaggged it did not extend to
>>the next, good record.
>>
>>I don't know how to reconcile this with the good pointing result
>>from last week.  I believe that Barry had things arranged to
>>automatically turn on ACU alertsd at that time, so the only
>>conclusion is that flagging is less sensitive at C band than
>>X band.  We need to fix this or defeat it by Wednesday night
>>if we expect to have a usefuk Modcomp free pointing run.
>>
>>_______________________________________________
>>    
>>
>
>As we discussed some time ago, I made the flagging limit angle a function
>of band; Yes, flagging is more sensitive at X band than at C band.
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