----------------------------------------------------------------------------- Mauna Loa Solar Observatory Observer's Log ----------------------------------------------------------------------------- Fri Oct 11 16:48:45 GMT 1996 Year: 96 Doy: 285 Observer: koon Fri Oct 11 16:48:49 GMT 1996 CHIP Startup--Initializing new tape WEATHER COMMENT: Fri Oct 11 16:48:53 GMT 1996 Scattered cirrus, wind=15 mph from the SSE, temp=46 F. Fri Oct 11 16:53:50 GMT 1996 dPMon Start Patrol Fri Oct 11 16:54:02 GMT 1996 CHIP CHIP Start Patrol MKIII COMMENT: Fri Oct 11 16:58:36 GMT 1996 Tape H01409 was in the drive, probably has data on it judging from yesterdays log. Will prepare it for mailing. Fri Oct 11 17:02:58 GMT 1996 dPMon Flat Fri Oct 11 17:03:52 GMT 1996 dPMon End Flat Fri Oct 11 17:04:34 GMT 1996 CHIP Bias Fri Oct 11 17:05:41 GMT 1996 CHIP End Bias Fri Oct 11 17:05:49 GMT 1996 CHIP Water Fri Oct 11 17:06:24 GMT 1996 CHIP End Water Fri Oct 11 18:02:58 GMT 1996 dPMon Flat Fri Oct 11 18:03:51 GMT 1996 dPMon End Flat Fri Oct 11 18:04:14 GMT 1996 CHIP Bias Fri Oct 11 18:05:22 GMT 1996 CHIP End Bias Fri Oct 11 18:05:30 GMT 1996 CHIP Water Fri Oct 11 18:06:03 GMT 1996 CHIP End Water Fri Oct 11 19:02:57 GMT 1996 dPMon Flat Fri Oct 11 19:03:48 GMT 1996 dPMon End Flat Fri Oct 11 19:03:46 GMT 1996 CHIP Bias Fri Oct 11 19:04:54 GMT 1996 CHIP End Bias Fri Oct 11 19:05:04 GMT 1996 CHIP Water Fri Oct 11 19:05:43 GMT 1996 CHIP End Water MKIII COMMENT: Fri Oct 11 19:58:38 GMT 1996 Still haven't been able to do a cal due to clouds. Fri Oct 11 20:03:03 GMT 1996 dPMon Flat Fri Oct 11 20:03:58 GMT 1996 dPMon End Flat Fri Oct 11 20:05:35 GMT 1996 CHIP Gain Fri Oct 11 20:09:57 GMT 1996 CHIP End Gain Fri Oct 11 20:10:06 GMT 1996 CHIP Bias Fri Oct 11 20:10:50 GMT 1996 CHIP End Bias Fri Oct 11 20:11:00 GMT 1996 CHIP Water Fri Oct 11 20:11:29 GMT 1996 CHIP End Water MKIII COMMENT: Fri Oct 11 20:20:02 GMT 1996 Pausing due to medium cirrus. Fri Oct 11 21:02:54 GMT 1996 dPMon Flat Fri Oct 11 21:03:46 GMT 1996 dPMon End Flat Fri Oct 11 21:07:29 GMT 1996 dPMon End Patrol DPMON COMMENT: Fri Oct 11 21:07:45 GMT 1996 Pausing due to medium cirrus. Fri Oct 11 21:09:25 GMT 1996 CHIP Bias Fri Oct 11 21:10:32 GMT 1996 CHIP End Bias Fri Oct 11 21:10:39 GMT 1996 CHIP Water Fri Oct 11 21:11:14 GMT 1996 CHIP End Water MKIII COMMENT: Fri Oct 11 21:38:24 GMT 1996 I watched the barrel angle readout downstairs carefully and didn't see any jumps that might account for the 5 degree mismatch versus rotational direction. I watched the encoder upstairs and there are no missing teeth on the encoder or barrel gears. The gears mesh fine and the encoder gear is sprung to always ride on the same face of each barrel gear cog, so backlash seems eliminated. I could see one or two setscrews and/or pins that fix the encoder shaft to the gear but they are almost impossible to get to, and one of them is partially hidden by the plate that is perpendicular to the shaft access. It is difficult to see if the end of the shaft always rotates fixed with the encoder gear. It is possible that there is some slippage between the two whenever the barrel changes direction. I'll try to figure out a way to determine this. Fri Oct 11 22:08:15 GMT 1996 CHIP Bias Fri Oct 11 22:09:22 GMT 1996 CHIP End Bias Fri Oct 11 22:09:29 GMT 1996 CHIP Water Fri Oct 11 22:10:04 GMT 1996 CHIP End Water COMMENT: Fri Oct 11 22:23:21 GMT 1996 Forgot to not that I extended the dome slot around 11:45, and that the CHIP image was vignetted just before that. Fri Oct 11 22:40:49 GMT 1996 CHIP CHIP End Patrol MKIII COMMENT: Fri Oct 11 22:24:11 GMT 1996 4 The large encoder gear (closest to the encoder) appears to move along with the barrel OK, but it could be slipping on that primary shaft, I'll try to find out if it is. I found out that the encoder gears aren't always sprung to ride on the same face of the barrel gear cogs as we thought they were. As the barrel rotates CCW (viewed from bottom looking towards front of Spar) somewhere around Az=80 degrees backlash is introduced as the gears suddenly become sprung in the opposite direction, they stay sprung incorrectly until the barrel stops at Az=184.10 and starts to rotate in the CW direction. In the CW scans the gears are sprung correctly and no backlash is introduced. I'm not sure if this accounts for the difference that Alice discovered, but it does introduce some encoder position error. I think I can fix it by increasing the coil spring force (probably easier said than done) so I'll try that tomorrow after I try to determine the amount of error that backlash can introduce. Fri Oct 11 23:41:30 GMT 1996 CHIP ending tape COMMENT: Fri Oct 11 23:57:06 GMT 1996 Activity report: QP: 135; 232; 278. No coronal activity. TAPES: ****** MKIII: H01410 DPMON: P00734 CHIP: C00151 LOWL: L00420 in drive #0 SCAN-LOG SCAN-LOG 16:54:29. 10/11/96 DOY 285 17:06:34 17:09:49 17:13:04 17:16:18 17:19:33 17:22:46 17:25:59 17:29:12 17:32:25 17:35:37 17:38:51 17:42:03 17:45:16 17:48:28 17:51:40 17:54:52 17:58:05 18:01:17 18:04:29 18:07:39 18:10:51 18:14:04 18:17:15 18:20:26 18:23:37 18:26:48 18:30:00 18:33:10 18:36:22 18:39:32 18:42:44 18:45:55 18:49:07 18:52:18 18:55:30 18:58:41 19:01:54 19:05:05 19:08:17 19:11:28 19:14:41 19:17:52 19:21:05 19:24:17 19:27:29 19:30:41 19:33:54 19:37:06 19:40:19 19:43:32 19:46:45 19:49:57 19:53:10 19:56:22 19:59:35 20:02:47 20:06:00 20:09:13 20:12:26 20:15:38 20:18:51 0 ERRORS OK