[evlatests] ea17 acceptance test

[Pat Van Buskirk]

Last night, antenna 17 experienced a phase loss, 28v fault, and NCP 
fault that would not reset. Antenna showed that it was e-stopped locally 
on the Wyemon panel. Cannot be pointed or stowed from the EVLA operator 
screen. After 25 minutes the phase and NCP alerts cleared, but the ACU 
faulted and would not reset. Cleared up about an hour later. Please see 
C119841.



Steven Durand wrote:
> Hi
> 
> I just completed the Electronics acceptance test on ea 17. The 
> Electronics acceptance test does not test for fringes or pointing.
> 
> The T5 switch power in all three bands seem OK. But the 8 bit RMS values 
> seem a little high.
> 
> Antenna IF channel	
> Band	X Band	L Band	K Band
> A	11.9	14.8	15.6
> B	11.0	11.0	11.2
> C	9.4	10.9	8.0
> D	11.8	11.5	9.6
> 
> Anyhow the antennas passes the electronics acceptance test
> but Ken just reported
> 
> Antenna 17, X band
> X band is very weak, down by an order of magnitude in G/T.
> There is too much power in the crossed hands, 10 to 20 per cent,
> and T_sys looks higher than it ought to be.  It certainly looks
> like there is a something wrong the the horn.
> 
> I think the antenna may not pass the Operations acceptance test.
> 
> 

-- 
Most of us can read the writing on the wall; we just assume it's 
addressed to someone else.

Ivern Ball