TPTCSOOF_071204
- Note: Project ID spontaneously changed to TPTCSOOF_71205 after the first 9 scans, and later to TPTCSOOF_71206
- Scan numbers continued to count up
- Test various values of tanh factor in friction compensator
- Obtain fast, several degree elevation scans (as in trad. holography) to test the new accelerometer (set 4)
- Azimuth motors 2 and 4 are out (Torq values near 0.0 in gbtlogs file azServo1Hz)
- -4.4C, 2.8 m/s at az=148deg, 915mBar, cloudy?
- Operator: Greg Monk
- Observers: Todd in CV, John in GB
Point up at X-band on 21236+0041, near transit
Set tanh values to 10,000.0 in both az and el (using "setKtransition(0, 10000.0)" and "setKtransition(1, 10000.0)" on gbtccu)
UT time Scan Gains Remark
23:04:34 10 10,000 15arcmin daisy, but not following a source 2007_12_04_23:05:46.fits 72s
23:12:33 11 " 7arcmin daisy, following 2136+0041 at az=208, 49 2007_12_04_23:13:35.fits 62s
23:17:58 12 100,000 15arcmin daisy 2007_12_04_23:18:42.fits 44s
23:23:22 13 " 7 2007_12_04_23:24:04.fits 42s
23:27:53 14 1,000,000 15arcmin 2007_12_04_23:28:37.fits 44s
23:31:48 15 " 7 2007_12_04_23:32:30.fits 42s
For completeness, set tanh values back to 10,000.0 and repeat 15arcmin daisy, but on source
23:38:37 16 10,000 15arcmin 2007_12_04_23:39:23.fits 46s
John suggests trying a smaller value, as 10000 looks best so far
23:42:52 17 1,000 15arcmin 2007_12_04_23:43:35.fits 43s
23:46:46 18 " 7 2007_12_04_23:47:31.fits 45s
23:52:24 19 5,000 15arcmin, az=221, el=44 2007_12_04_23:53:17.fits 53s
23:56:28 20 " 7 2007_12_04_23:57:13.fits 45s
00:02:27 21 500 15arcmin 0.60 2007_12_05_00:03:13.fits 46s
00:06:25 22 " 7arcmin 0.60 2007_12_05_00:07:10.fits 45s
00:11:34 23 1E+10 15arcmin 0.60 2007_12_05_00:12:17.fits 43s
00:15:28 24 " 7 0.60 2007_12_05_00:16:13.fits 45s
00:21:18 25 500 15arcmin but with 0.70 friction comp on azim(instead of 0.6) 2007_12_05_00:22:00.fits 42s
00:25:11 26 " 7 0.70 2007_12_05_00:25:55.fits 44s
Project code incremented to TPTCSOOF_71206 (for unknown reasons)
00:29:49 27 " 15arcmin 0.90 2007_12_05_00:30:33.fits
00:33:34 28 " 7 0.90 2007_12_05_00:34:29.fits
00:38:04 29 " 15arcmin 1.20 2007_12_05_00:38:46.fits
00:41:58 30 " 7 1.20 2007_12_05_00:42:43.fits
00:46:50 31 1,000 15arcmin 0.90 2007_12_05_00:47:32.fits
accel1: X rms = 0.00135 Y rms = 0.00156 Z rms = 0.00134
accel2: 0.00052 0.00012 0.000052
accel3: 0.000924 0.000146 0.000109
accel4: X rms = 0.00112 0.00148 0.00139
00:50:43 32 " 7 0.90 2007_12_05_00:51:28.fits
switch to constant acceleration scans:
start with azgain=0.90, tanh=500
01:01:50 33 setTrajectory(237, 45, +0.55*0.5, 0.0, -0.025, 0.0, 0.55/0.025) started
01:03:44 34 - +
01:05:50 35 + - but with az gain=0.60
01:07:17 36 - + "
01:09:28 37 + - but with tanh = 1000, az gain=0.60
01:10:50 38 - + "
accel1: X rms = 0.005427 Y rms = 0.0118 Z rms = 0.0083
accel2: 0.001105 0.00076 0.00011
accel3: 0.001318 0.00048 0.00014
accel4: 0.006745 0.01151 0.0086
switch to elevation motion
01:13:36 39 setTrajectory(237, 45, 0.0, +0.15, 0.0, -0.025, 0.3/0.025)
01:14:44 40 - +
accel1: X rms = 0.00327 Y rms = 0.0128 Z rms = 0.0080
accel2: 0.00076 0.00040 0.00006
accel3: 0.00107 0.00027 0.00011
accel4: 0.00456 0.0119 0.0084
Joe switched back to existing software
Project incremented to TPTCSPNT_71130 for unknown reasons
01:29:55 scan ? 4 degree elevation scan in 2 minutes (using SB=elevationScan)
accel1: X rms = +0.00346065 Y rms = +0.0126345, Z rms = +0.00539474
accel2: 0.00077479 0.0001308 0.00004499
accel3: 0.00102305 0.0001379 0.00009559
accel4: X rms = +0.00403928 Y rms = +0.0123963, Z rms = +0.00581061
Done
-- ToddHunter - 04 Dec 2007
daisyazimcompare.pdf