----------------------------------------------------------------------------- Mauna Loa Solar Observatory Observer's Log ----------------------------------------------------------------------------- Fri Sep 10 16:40:51 GMT 1999 Year: 99 Doy: 253 Observer: yasukawa Fri Sep 10 16:42:04 GMT 1999 CHIP Startup--Initializing new tape WEATHER COMMENT: Fri Sep 10 16:42:11 GMT 1999 Cool, clear, light south breeze. Fri Sep 10 16:46:54 GMT 1999 CHIP CHIP Start Patrol Fri Sep 10 16:47:00 GMT 1999 PICS Start Patrol Fri Sep 10 16:47:24 GMT 1999 MKIV Start Patrol **MKIV PROBLEM**: Fri Sep 10 16:59:48 GMT 1999 pins from sky tx pulled out of connector while trying to attach a probe to ground pin. Looking for documentation to figure out which pins of the 37-pin connector they were connected to. Fri Sep 10 17:02:50 GMT 1999 CHIP Bias Fri Sep 10 17:03:43 GMT 1999 CHIP End Bias Fri Sep 10 17:03:52 GMT 1999 CHIP Water Fri Sep 10 17:04:32 GMT 1999 CHIP End Water **MKIV PROBLEM**: Fri Sep 10 17:38:24 GMT 1999 OK, David saw my log comment and looked up the pin-outs for the 3125 board and called with the correct pin-outs. pins replaced and sky tx data, albeit noisy, is being input to the A/D. We discussed grounding the inputs to channel 5 as specified in the 3125 manual to hopefully quiet the signal. This will be done when I make up a jumper. Sky tx is plugged into chan 6, pins 12 (hi) and pin 30 (lo). PSPT COMMENT: Fri Sep 10 17:42:40 GMT 1999 Got sidetracked and did not start PSPT until a little while ago. Fri Sep 10 18:00:28 GMT 1999 PICS Flat Fri Sep 10 18:01:51 GMT 1999 CHIP Bias Fri Sep 10 18:02:53 GMT 1999 CHIP End Bias Fri Sep 10 18:03:03 GMT 1999 CHIP Water Fri Sep 10 18:03:08 GMT 1999 PICS End Flat Fri Sep 10 18:03:42 GMT 1999 CHIP End Water Fri Sep 10 18:25:19 GMT 1999 MKIV Start Cal Fri Sep 10 18:47:11 GMT 1999 MKIV Start Patrol **MKIV PROBLEM**: Fri Sep 10 18:50:29 GMT 1999 Sky tx cap in place for a couple of scans. **MKIV PROBLEM**: Fri Sep 10 18:51:13 GMT 1999 One of the things this is doing is the guiding is very unstable as the signal dropped to nearly dark, and the sky tx provides the agc for the guider. **MKIV PROBLEM**: Fri Sep 10 18:57:48 GMT 1999 Removed cap from sky tx. a/d chan 5 is grounded to pin 1 (pins 13, 31, and 1 are jumpered together). **MKIV PROBLEM**: Fri Sep 10 18:59:34 GMT 1999 Now I can see sky tx values on KCC monitor jumping around between 340-350. Fri Sep 10 19:00:58 GMT 1999 CHIP Bias Fri Sep 10 19:01:28 GMT 1999 PICS polarization_calibration Fri Sep 10 19:01:56 GMT 1999 CHIP End Bias Fri Sep 10 19:02:13 GMT 1999 CHIP Water Fri Sep 10 19:02:56 GMT 1999 CHIP End Water COMMENT: Fri Sep 10 19:09:01 GMT 1999 Stopping to reconfigure dome shutter. Fri Sep 10 19:09:24 GMT 1999 CHIP CHIP End Patrol Fri Sep 10 19:11:15 GMT 1999 PICS End Patrol Fri Sep 10 19:15:23 GMT 1999 MKIV End Patrol Fri Sep 10 19:19:33 GMT 1999 MKIV Start Patrol Fri Sep 10 19:19:56 GMT 1999 PICS Start Patrol Fri Sep 10 19:19:56 GMT 1999 PICS Start Patrol Fri Sep 10 20:02:48 GMT 1999 CHIP Gain Fri Sep 10 20:07:22 GMT 1999 CHIP End Gain Fri Sep 10 20:07:32 GMT 1999 CHIP Bias Fri Sep 10 20:08:23 GMT 1999 CHIP End Bias Fri Sep 10 20:08:38 GMT 1999 CHIP Water Fri Sep 10 20:09:19 GMT 1999 CHIP End Water **MKIV PROBLEM**: Fri Sep 10 20:36:44 GMT 1999 I got to checking the signal from the sky tx further and if one slows the scope down and reduces the sensitivity, the signal is a square wave with a duty cycle of around 10% "off" and 90% on, with an amplitude of 3.5 volts, and a "lo" voltage of 1 volt, measured in DC across the differential lines. the period is about 17 ms. The excursion to 1-volt and back is not square, but drops rapidly and immediately ramps back up to 3.5 volts with a 2 ms overshoot and recovery of 0.2 volts amplitude around the 3.5 volt level. Could this negative "spike" be the cause of the drift? i.e. reads may occur during the negative excursions or if they are sampled over a short period, the spike may be part of the average?? What is the a/d's sampling frequency??? Are several samples averaged over the display period???? -- Just some food for thought. Fri Sep 10 21:00:47 GMT 1999 CHIP Bias Fri Sep 10 21:01:44 GMT 1999 CHIP End Bias Fri Sep 10 21:01:59 GMT 1999 CHIP Water Fri Sep 10 21:02:44 GMT 1999 CHIP End Water **MKIV PROBLEM**: Fri Sep 10 21:03:00 GMT 1999 Double checked the fact that I was looking at a differential signal and the hi to analog ground maintains the waveform I described above and the lo to analog ground is a noisy 0-volts DC. So the differential signal IS as described above. Fri Sep 10 22:00:58 GMT 1999 CHIP Bias Fri Sep 10 22:01:57 GMT 1999 CHIP End Bias Fri Sep 10 22:02:16 GMT 1999 CHIP Water Fri Sep 10 22:02:56 GMT 1999 CHIP End Water Fri Sep 10 22:04:30 GMT 1999 PICS End Patrol Fri Sep 10 22:06:27 GMT 1999 CHIP CHIP End Patrol Fri Sep 10 22:07:10 GMT 1999 CHIP ending tape COMMENT: Fri Sep 10 22:08:57 GMT 1999 Tapes: MKIV: 99-253 PICS: P01541 CHIP: C00917 LOWL: L00625 in drive #1 Fri Sep 10 22:10:51 GMT 1999 MkIII 16_47.rawmk3 17_50.rawmk3 19_04.rawmk3 20_12.rawmk3 21_15.rawmk3 16_50.rawmk3 17_53.rawmk3 19_08.rawmk3 20_15.rawmk3 21_18.rawmk3 16_54.rawmk3 17_57.rawmk3 19_12.rawmk3 20_19.rawmk3 21_22.rawmk3 16_57.rawmk3 18_00.rawmk3 19_19.rawmk3 20_22.rawmk3 21_25.rawmk3 17_01.rawmk3 18_04.rawmk3 19_23.rawmk3 20_26.rawmk3 21_29.rawmk3 17_04.rawmk3 18_07.rawmk3 19_26.rawmk3 20_29.rawmk3 21_32.rawmk3 17_08.rawmk3 18_11.rawmk3 19_30.rawmk3 20_33.rawmk3 21_36.rawmk3 17_11.rawmk3 18_14.rawmk3 19_33.rawmk3 20_36.rawmk3 21_39.rawmk3 17_15.rawmk3 18_18.rawmk3 19_37.rawmk3 20_40.rawmk3 21_43.rawmk3 17_18.rawmk3 18_21.rawmk3 19_40.rawmk3 20_43.rawmk3 21_46.rawmk3 17_22.rawmk3 18_29.rawmk3 19_44.rawmk3 20_47.rawmk3 21_50.rawmk3 17_25.rawmk3 18_36.rawmk3 19_47.rawmk3 20_50.rawmk3 21_53.rawmk3 17_29.rawmk3 18_43.rawmk3 19_51.rawmk3 20_54.rawmk3 21_57.rawmk3 17_32.rawmk3 18_47.rawmk3 19_54.rawmk3 20_57.rawmk3 22_00.rawmk3 17_36.rawmk3 18_50.rawmk3 19_58.rawmk3 21_01.rawmk3 22_04.rawmk3 17_39.rawmk3 18_54.rawmk3 20_01.rawmk3 21_04.rawmk3 c18_25.rawmk3 17_43.rawmk3 18_57.rawmk3 20_05.rawmk3 21_08.rawmk3 c18_32.rawmk3 17_46.rawmk3 19_01.rawmk3 20_08.rawmk3 21_11.rawmk3 c18_39.rawmk3