VERY LONG BASELINE ARRAY OBSERVING LOG -------------------------------------- Project: BZ031 Observer: H. Zhang Project type: VLBA Obs filename: bz031crd.* Date/Day: 2004FEB25/056 Ants Scheduled: SC HN NL FD LA PT KP OV BR MK =UT-Time===Comment===============================================MF#===%AD==AMD= 2142 Start. Op. D. Medcalf. vclock and GPS delta check okay. Webcam wea: HN, NL, LA, PT clear; FD, KP partly cloudy; SC mostly cloudy; BR, MK overcast; OV overcast and raining. 2234-2236 *PT autostowed due to power glitch. COM 100 2 2251 New operator: T. Perreault 2306 HN site techs left tape up on drive 1 but did not mount it for use. Mounted tape. 2322 Readback check ok 2340 Readback check ok 2355 %OV wea: overcast, raining 2356-2359 *PT autostowed. Power glitch. Repointed. COM 100 3 0000 Date is 2004FEB26/057. 0108 Readback check ok 0129 %BR wea: raining 0142-0145 %SC there was a ROTATION MOTION ANALYSIS FAULT FRM 100 3 condition. Subreflector was in position in ROTATION, but the data was being flagged. Did a MASTER CLEAR reset and re-read current observation scan. Data should be ok. 0323 PT bad readback drive 1 track 7; all other sites ok 0357 Readback check ok 0504 Readback check ok 0522 Readback check ok 0557 MK readback check ok 0631 Readback check ok 0636 New operator is Jim Ogle. 0648 Readbacks okay. 0724 Readbacks okay. 0814 Readbacks okay. 0907 Readbacks okay. 0942 Readbacks okay. 1032-1033 *SC rotation motion analysis fault. Cleared error FRM 100 1 and resent position command. 1049 Readbacks okay. 1108 Readbacks okay. 1144 Readbacks okay. 1234 %SC reports overcast skies, low clouds, light rain. 1320 HN reports clear skies. 1359-1402 *HN AZ#2 armature over current fault, antenna not ACU 100 3 tracking properly in azimuth. Briefly disabled the AZ axis to clear error then re-enabled to resume pointing. 1417-1418 *SC rotation motion analysis fault again. FRM 100 1 1444 New operator is Paul Dyer. 1452 BR WEA: Site tech reports overcast, low clouds. Ground and dish are wet. 1457 LA WEA: Site tech reports scattered high clouds. Ground and dish are dry. 1458 KP WEA: Site tech reports scattered high clouds. The ground and dish are dry. 1507-1508 *SC rotation motion analysis fault again. FRM 100 1 1508 *SC WEA: Raining. 1540-1543 *FD FRM not at commanded position in either FRM 100 3 rotation not focus. I did a master clear and reobs to fix the problem. 1606 OV WEA: Site tech reports partly cloudy skies. Ground and dish are wet. 1614-1657 *SC FRM rotation position error. Rotation motors FRM 100 43 foldback. Rotation motion analysis fault. I have tried resetting the rotation, recommanding, master clear and reobs, manually commanding to other positions and then back to correct postion and none of these has worked. Error is about two degrees. Commanded position is 274 degrees. 1650 SC Rotation error is 0.6deg. Data is being flagged 1706 %NL Bad readbacks on drive 1, tracks 3,5,10,12,19, and 21. All other sites are ok. 1725 *BR WEA: Raining. 1749-1752 *OV Autostowed. Power glitch. COM 100 3 1907 MK wea: overcast. 2026-2032 *OV Source is behind the mountain, hence high Tsys values. 2041 Readbacks at all sites were ok. 2115 End. Downtime Summary: Total downtime : 63 min Percentage downtime of observing: 0.4% Average downtime per hour : 0.3 min Total scheduled observing time (# Antennas): 14130 min (10) Notes: * = Entries where data was affected. % = Entries where data may have been affected. & = Entries where the site tech was called out. WEA = Weather entries. MF# = Maintenance form or major downtime category associated with a problem. %AD = The percentage of an antenna affected by a problem. AMD = Total antenna-minutes downtime for a problem. Tsys = System Temperature (TP/SP x Tcal/2) ACU = Antenna Control Unit FRM = Focus/Rotation Mount RFI = Radio Frequency Interference VME = Site control computer CB = Circuit Breaker vclock = Program that compares site clock time to a standard.