Date: Mon, 16 Nov 1998 05:11:05 -0700 From: long@apo.nmsu.edu (Dan Long) Subject: 2.5m obslog 981115 SATURDAY NOVEMBER 14, 1998 APACHE POINT OBSERVATORY SDSS 2.5m OBSERVING LOG The telescope was opened at 16:50 to clear skies. The skies remained clear all night. However the seeing deteriorated only an hour after astronomical twilight from around 1 arcsecond to nearly 2. Unlike last night, it never improved again. The good news for the night is that the primary position of last night, seemed good at the start of tonight, inspite of any thermal equilibration issues. At the very start of the run we got subarcsecond seeing on about a quarter of the array, very similar to last night. We parked on the equator and meridian and setup on the Northern equatorial strip. We were taking science data by 20:00, albeit in not very good seeing. However a tape label problem was discovered a short time later which led us in the end to trash all the data thus far in the night and start over. We resumed taking data a little after 21:00. At around 02:00 we noticed what looked like a drift in secondary piston of 600 microns over about the last 45 minutes. The problem was traced to the fact that the focus changes requested by the focus loop were not actually being implemented. I started a host session to the secondary and got several lines sent to me all at once, but couldn't get the normal colon prompt. It was a > instead. I got no response to status. It didn't seem to understand any normal command. Eventually I went down and power cycled the galil ( and actuators ). This brought back the normal colon prompt. I homed the secondary and then returned to the nominal position. Things worked after that. An excerpt of what I got back from the host session, and the home command is at the end of the report. We decided to close up for the night at 04:00 as the seeing was not getting any better. All in all, not a great night, but at least the primary position yielded good image quality at the same positions as last night ( at least while the atmosphere was cooperating ). Dan What I got when I started a host session to the secondary when it had stopped talking to the focus loop. : 0001447650, 0001534300, 0001691500, -0000011050, -000A=1462754.;? B=1542754.;: C=1699945.;: D=-11029.;: E=-18029.;: XQ #MV : 0001447650, 0001542750, 0001699950, -0000011050, -000A=1456203.;? B=1536203.;: C=1693393.;: D=-11030.;: E=-18030.;: XQ #MV :A=1446376.;: B=1526376.;: C=1683567.;: D=-11030.;: E=-18030.;:X MV ? 0001446400, 0001526400, 0001693400, -0000011050, -000001A=1438439.;? B=1518439.;: C=1675630.;: D=-11031 .;: E=-18031.;: XQ #MV : 0001446400, 0001518450, 0001675650, -0000011050, -000A=1430754.;? B=1510754.;: C=1667945.;: D=-11032.;: E=-18032.;: XQ #MV :A=1419794.;: B=1499794.;: C=1656984.;: D=-1103 0001419802.;? E=-18032.;: XQ #MV :A=1413369.;: B=1493369.;: C=1650559.;: D=-11033.;: E=-18033.;: Q#MV ? 0001413350, 0001493350, 00016A=1418912.;?EXCEPT d 00000080 00000000 00000000 322E3BBF FFFC8CC6 0000003F 00000000 0000003F a 0004D0AC 00000707 000001002.; E=?-18032.; XQ #M?V >A=1471699.; B=?1551699.; C=17?0889.; D=-1102?8.;E=-18028.; ?XQ MV >A=1471699.; B=?1551699.; C=17?08889.; D=-110?28.; E=-18028.?; XQ #MV ?A=1527006.; B=?1607006.; C=17?64196.; D=-110?24.; E=-18024.?; XQ #MV ?A=1527006.; B=?1607006.; C=17?64196.; D=-110?24.; E=-18024.?; XQ #MV ?A=1579290.; B=?1659290.; C=18?16480.; D=-110?20.; E=-18020.?; XQ #MV ?A=1579290.; B=?1659290.; C=18?16480.; D=-110?20.; E=-18020.?; XQ #MV ?A=1641652.; B=?1721652.; C=18?78842.; D=-110?15.; E=-18015.?; XQ #MV ?A=1641652.; B=?1721652.; C=18?78842.; D=-110?15.; E=-18015.?; XQ #MV ?A=1707415.; B=?1787415.; C=19?44606.; D=-110?10.; E=-18010.?; XQ #MV ?A=1774187.; B=?1854187.; C=20?11377.; D=-110?05.; E=-18005.?; XQ #MV ?A=1774187.; B=?1854187.; C=20?11377.; D=-110?05.; E=-18005.?; XQ #MV ?A=1831762.; B=?1911762.; C=20?68952.; D=-110?01.; E=-18001.?; XQ #MV ?A=1831762.; B=?1911762.; C=20?68952.; D=-110?01.; E=-18001.?; XQ #MV ?A=1893998.; B=?1973998.; C=21?31188.; D=-109?96.; E=-17996.?; XQ #MV ?A=1893998.; B=?1973998.; C=21?31188.; D=-109?96.; E=-17996.?; XQ #MV ?A=1959509.; B=?2039509.; C=21?96699.; D=-109?91.; E=-17991.?; XQ #MV ?A=1959509.; B=?2039509.; C=21?96699.; D=-109?91.; E=-17991.?; XQ #MV ?A=2022249.; B=?2102249.; C=22?59440.; D=-109?87.; E=-17987.?; XQ #MV ?A=2022249.; B=?2102249.; C=22?59440.; D=-109?87.; E=-17987.?; XQ #MV ?A=2080958.; B=?2160958.; C=23?18148.; D=-109?82.; E=-17982.?; XQ #MV ?A=2080958.; B=?2160958.; C=23?18148.; D=-109?82.; E=-17982.?; XQ #MV ?A=2135887.; B=?2215887.; C=23?73077.; D=-109?78.; E=-17978.?; XQ #MV ?A=2135887.; B=?2215887.; C=23?73077.; D=-109?78.; E=-17978.?; XQ #MV ?A=2183887.; B=?2263887.; C=24?2107.; D=-1097?5.;E=-17975.; ?XQ MV >A=2183887.; B=?2263887.; C=24?21077.; D=-109?75.; E=-17975.?; XQ #MV ?A=2195603.; B=?2275603.; C=24?32793.; D=-109?74.; E=-17974.?; XQ #MV ?A=2232391.; B=?2312391.; C=24?69581.; D=-109?71.; E=-17971.?; XQ #MV ?A=2241335.; B=?2321335.; C=24?78526.; D=-109?70.; E=-17970.?; XQ #MV ?A=2249524.; B=?2329524.; C=24?86715.; D=-109?70.; E=-17970.?; XQ #MV ?A=2258091.; B=?2338091.; C=24?95282.; D=-109?69.; E=-17969.?; XQ #MV ?A=2267036.; B=?2347036.; C=25?04226.; D=-109?69.; E=-17969.?; XQ #MV ?A=2276359.; B=?2356359.; C=25?13549.; D=-109?68.; E=-17968.?; XQ #MV ?A=2285178.; B=?2365178.; C=25?22368.; D=-109?67.; E=-17967.?; XQ #MV ? AFTER POWER CYCLE :XQ#HOME : 0400.2, 0400.2, 0400.2, 0006.4, 0006.4 max sec to find reverse limit switch at high speed 0030.1, 0030.1, 0030.1, 0030.1, 0030.1 max sec to find home switch transition 0010.2, 0010.2, 0010.2, 0000.4, 0000.4 sec to move out of limit switch again 0004.5, 0004.5, 0004.5, 0000.1, 0000.1 max sec to find index 041, 001.5 microsteps, sec to find full step Unknown position error -0008000000, -0008000000, -0008000000, -0000050000, -0000050000 current position 05 00000050, 00000263, 01.40 # axes, microsteps/full step, param word, software version -0008000000, -0008000000, -0008000000, -0000050000, -0000050000 reverse limits 0008000000, 0008000000, 0008000000, 0000050000, 0000050000 forward limits 0000050000, 0000050000, 0000050000, 0000020000, 0000020000 speed 0000500000, 0000500000, 0000500000, 0000500000, 0000500000 accel -0000000400, -0000000400, -0000000400, 0000000000, 0000000000 encoder resolution (ticks/step) OK