### OBSDATE ###
20121016

### LOGDATE ###
121017

### OBSERVERS ###
XH

### WEATHER ###
Start : Some cirrus, RH < 35% 
End : clear, RH = 60 %

### LOCATION ###
ROCS (Sydney)

### PROGRAM ###
Be and binary stars

### SIDEROSTATS ###
 n3  s1  s3 

### TARGETS ###
alpha ara
alpha eri
alpha psca

### QUALITY ###
 Average 

### PROBLEMS ###
Fringes at -845 on alpha ara.
But couldn't find the fringes on the calibrator, so I reindexed LDC, nothing changed. Zeroed opcon, the zero was ~20 cm away. 
As I suspected the north metrology got lost because the signal was low close to the fringe packet (but I haven't seen it diseapparing), I tweaked it a bit  on the way to the source fringe packet (just after I saw the metrology signal decreased a bit). Still I couldn't find the fringes.
I zeroed opcon, it was off again by 50 cm. At the zero the north metrology signal was quite low. So it looks like the rails are not aligned, doesn't it ?

After optimizing the north metrology, I went on another target to avoid the sector at > ~ +16 m where I had problems, because earlier, I could find the fringes at ~ + 14m.


Found fringes on alpha eri at -859. Opcon is at ~+15.1m), north metrology signal is still very good. Start to drop at 15.2m.
 

Conditions are good, I try N3 S3 as a next step. Fringes at -475 mu and quite jumpy but still good.