| SOD | Year | Day of Year |
Time of Day |
Data Impact | System | Description |
|---|---|---|---|---|---|---|
| 78403501 | 2023 | 117 | 10:45 | 1 | 12.01.01 | Second Druck barometer switched to primary |
| 78403501 | 2022 | 041 | 11:00 | 1 | 9.01.02 | H-Maser providing timing signals again following repair and testing |
| 78403501 | 2021 | 322 | 14:00 | 1 | 5.01 | kHz laser returns to operation |
| 78403501 | 2021 | 298 | 16:00 | 1 | 5.01 | kHz laser problem, switch to 12Hz laser. |
| 78403501 | 2021 | 146 | 11:00 | 1 | 9.01.02 | H-Maser problem, timing signals switched to S650 source |
| 78403501 | 2020 | 269 | 10:00 | 1 | 5.01 | Switched to kHz laser for SLR operations |
| 78403501 | 2020 | 240 | 09:00 | 0 | 5.01 | 12Hz laser service |
| 78403501 | 2020 | 211 | 19:00 | 1 | 5.01 | Switched to older 12Hz laser for SLR operations |
| 78403501 | 2020 | 198 | 18:00 | 1 | 06.01.07 | New SPAD cable fitted |
| 78403501 | 2020 | 049 | 18:00 | 0 | 7.02 | New Ranging PC installation complete |
| 78403501 | 2020 | 041 | 21:00 | 0 | 7.02 | PC fatal crash. Motherboard stopped working. |
| 78403501 | 2019 | 136 | 08:30 | 1 | 05.02 | New kHz freq-doubler crystal fitted |
| 78403501 | 2019 | 098 | 08:30 | 1 | 05.02 | kHz chiller water changed and flow cleaned |
| 78403501 | 2018 | 339 | 08:30 | 1 | 9.01.02 | GPS reference replaced with new S650 GPS receiver |
| 78403501 | 2018 | 275 | 08:30 | 1 | 06.01.07 | New SPAD cable fitted |
| 78403501 | 2018 | 268 | 08:30 | 0 | 99 | correction to rms in CRD record 50 pass statistics |
| 78403501 | 2018 | 254 | 08:30 | 0 | 04.01 | Narrow spectral filter fitted with oven. Tilted |
| 78403501 | 2018 | 141 | 08:30 | 1 | 05 | Coude mirrors cleaned |
| 78403501 | 2018 | 120 | 08:30 | 0 | 04.01 | New narrow spectral filter fitted |
| 78403501 | 2018 | 116 | 08:30 | 0 | 99 | Mains electrical provided by power grid |
| 78403501 | 2018 | 099 | 08:30 | 0 | 99 | Mains electrical provided by generator |
| 78403501 | 2018 | 074 | 08:30 | 0 | 04.01 | New daytime narrow filter assemby fitted |
| 78403501 | 2018 | 036 | 08:30 | 1 | 08.02 | New external target adopted as primary calibration. New survey values used. |
| 78403501 | 2018 | 002 | 08:30 | 1 | 9.01.02 | Resynced H-Maser with GPS3 1pps |
| 78403501 | 2017 | 362 | 08:30 | 1 | 9.01.02 | Fault with H-Maser detected and reset |
| 78403501 | 2017 | 328 | 08:30 | 1 | 05.02 | kHz start diode adjusted to give 2V ouput |
| 78403501 | 2017 | 327 | 08:30 | 0 | 05.02 | kHz laser service |
| 78403501 | 2017 | 319 | 08:30 | 1 | 9.01.02 | Fault with H-Maser detected, previous 10 days SLR data corrected and resubmitted. |
| 78403501 | 2017 | 311 | 08:30 | 1 | 9.01.02 | PC clock and ISA clock drift detected |
| 78403501 | 2017 | 160 | 08:30 | 1 | 9.01.02 | PC clock driven by 5MHz maser signal |
| 78403501 | 2017 | 097 | 15:30 | 1 | 5.01 | Switched to kHz laser for SLR operations |
| 78403501 | 2017 | 090 | 08:30 | 1 | 5.01 | Switched to older 12Hz laser for SLR operations |
| 78403501 | 2017 | 090 | 08:30 | 1 | 5.03 | Water flow rate through kHz laser found to be very low and not providing sufficient cooling |
| 78403501 | 2017 | 083 | 08:30 | 1 | 9.01.02 | SLR timing switched back to H-Maser for 10MHz and 1pps |
| 78403501 | 2017 | 071 | 08:30 | 1 | 9.01.02 | H-Maser failure. SLR timing switched to GPS3 for 10MHz and 1pps |
| 78403501 | 2016 | 244 | 08:30 | 0 | 10. | Reduction in return rate bin size to identify high signal strength data for removal |
| 78403501 | 2016 | 239 | 08:30 | 0 | 6.01.07 | Adjustement to real-time ND filter control to reduce signal strength |
| 78403501 | 2016 | 141 | 08:30 | 1 | 9.01.02 | 1pps cable to HxET replaced |
| 78403501 | 2016 | 076 | 08:30 | 0 | 4.01 | Spare daytime narrow filter installed |
| 78403501 | 2015 | 279 | 08:30 | 0 | 04.01 | Previous daytime narrow filter setup reinstalled |
| 78403501 | 2015 | 247 | 08:30 | 0 | 05.01 | 1/4 wave plate installed for kHz laser to provide circular polarisation (this was unsuccessful) |
| 78403501 | 2015 | 237 | 08:30 | 0 | 04.01 | New daytime narrow filter setup, including new narrow oven filter, installed |
| 78403501 | 2015 | 189 | 08:30 | 0 | 04.01 | New daytime narrow filter setup, including new blocking filter, installed |
| 78403501 | 2015 | 145 | 08:30 | 1 | 06.01.07 | Start and Stop pulses to Riga and HxET timers reduced in duration to 30ns |
| 78403501 | 2014 | 279 | 08:30 | 1 | 05.02 | kHz laser upgrade to Nd:YAG with increased pulse energy and 1kHz ability |
| 78403501 | 2014 | 056 | 08:30 | 0 | 99 | Electrical rewiring in control room, offices and in telescope dome. |
| 78403501 | 2014 | 035 | 08:30 | 2 | 05.01 | Nd:YAG start diode and discriminator adjusted to improve calibration leading edge. |
| 78403501 | 2014 | 027 | 08:30 | 1 | 05.01 | Nd:YAG laser service and pulse selector trial. Completed 3/2/14 and selector removed. |
| 78403501 | 2013 | 221 | 08:30 | 1 | 05 | Emitter end optic cleaned |
| 78403501 | 2013 | 211 | 08:30 | 0 | 05 | Coude mirrors M2, M3 and M4 replaced |
| 78403501 | 2013 | 207 | 08:30 | 1 | 08.01 | TR reduction software adjusted for better performance with kHz signal to noise |
| 78403501 | 2013 | 137 | 08:30 | 1 | 05.02 | 2kHz laser start diode adjustment |
| 78403501 | 2013 | 130 | 08:30 | 1 | 06.01.07 | Gate cable to SPAD changed |
| 78403501 | 2013 | 128 | 08:30 | 1 | 05.02 | 2kHz Nd:VAN laser back in operation |
| 78403501 | 2013 | 008 | 08:30 | 2 | 08.01 | New power supply fitted to Lecroy discriminators to eliminate cause of calibration jumps |
| 78403501 | 2012 | 289 | 08:30 | 1 | 08.01 | SPAD signals in Lecroy discriminator changed |
| 78403501 | 2012 | 282 | 08:30 | 1 | 08.01 | Change in Lecroy discriminator setup |
| 78403501 | 2011 | 280 | 08:30 | 1 | 06.01.07 | Cables to event timer changed |
| 78403501 | 2011 | 264 | 08:30 | 1 | 05.01 | Nd:YAG laser service |
| 78403501 | 2011 | 255 | 08:30 | 1 | 06.01.07 | Cables to event timer swapped |
| 78403501 | 2011 | 255 | 08:30 | 1 | 06.01.07 | SPAD5 removed and C-SPAD fitted |
| 78403501 | 2011 | 252 | 08:30 | 1 | 06.01.07 | SPAD signal cable changed |
| 78403501 | 2011 | 244 | 08:30 | 1 | 06.01.07 | SPAD signal and gate cables switched |
| 78403501 | 2011 | 110 | 08:30 | 0 | 06 | Spectral filter switch and cable replaced |
| 78403501 | 2011 | 053 | 08:30 | 1 | 05.01 | Nd:YAG laser service |
| 78403501 | 2011 | 033 | 08:30 | 1 | 06.01.07 | SPAD signal and gate cables changed |
| 78403501 | 2010 | 302 | 08:30 | 1 | 05 | Coude mirrors M2 swapped for old M1 |
| 78403501 | 2010 | 279 | 08:30 | 1 | 99 | PSU damaged by powercut and replaced |
| 78403501 | 2010 | 250 | 08:30 | 2 | 12.02.03 | New Rotronics Met device becomes primary reference |
| 78403501 | 2010 | 245 | 08:30 | 1 | 06 | New Telescope dichroic mirror fitted |
| 78403501 | 2010 | 145 | 08:30 | 1 | 05.01 | Nd:YAG laser service |
| 78403501 | 2010 | 111 | 08:30 | 1 | 06 | Old Telescope dichroic mirror refitted |
| 78403501 | 2010 | 081 | 08:30 | 0 | 05.02 | 2kHz laser maintenance |
| 78403501 | 2010 | 049 | 08:30 | 1 | 06.01.07 | SPAD5 fitted |
| 78403501 | 2010 | 036 | 08:30 | 1 | 05.02 | 2kHz laser start diode adjustment |
| 78403501 | 2010 | 012 | 08:30 | 1 | 06 | Telescope dichroic mirror removed for glass replacement |
| 78403501 | 2010 | 004 | 08:30 | 1 | 06.01.07 | SPAD5 removed and C-SPAD installed |
| 78403501 | 2009 | 280 | 08:30 | 1 | 05 | Emitter beam expander exit window replaced |
| 78403501 | 2009 | 168 | 08:30 | 1 | 05.01 | Nd:YAG start diode removed and refitted |
| 78403501 | 2009 | 096 | 17:00 | 1 | 06.01.07 | New SPAD cables fitted |
| 78403501 | 2009 | 007 | 08:30 | 1 | 06.01.07 | SPAD5 fitted |
| 78403501 | 2008 | 353 | 08:30 | 1 | 06.01.07 | SPAD5 tests |
| 78403501 | 2008 | 333 | 08:30 | 1 | 06.01.05 | SR620 reinstalled in system |
| 78403501 | 2008 | 331 | 08:30 | 1 | 05.02 | 2kHz Nd:VAN operational, new freq-doubler crystal fitted |
| 78403501 | 2008 | 308 | 08:30 | 1 | 05.02 | 2kHz Nd:VAN offline |
| 78403501 | 2008 | 294 | 08:30 | 0 | 05 | Coude mirror M3 replaced |
| 78403501 | 2008 | 290 | 08:30 | 1 | 06.01.07 | SPAD signal cable changed |
| 78403501 | 2008 | 280 | 08:30 | 0 | 05.02 | 2kHz Nd:VAN maintenance |
| 78403501 | 2008 | 246 | 08:30 | 0 | 05.01 | Nd:YAG maintenance |
| 78403501 | 2008 | 189 | 08:30 | 1 | 06.01.07 | C-SPAD fitted |
| 78403501 | 2008 | 177 | 08:30 | 2 | 13.01 | IGN site-survey |
| 78403501 | 2008 | 144 | 08:30 | 0 | 05.01 | Nd:YAG maintenance |
| 78403501 | 2008 | 133 | 08:30 | 1 | 05.01 | Nd:YAG interpulse gap changed |
| 78403501 | 2008 | 121 | 08:30 | 1 | 06.01.07 | C-SPAD damaged. Replaced with SPAD-3B |
| 78403501 | 2008 | 055 | 08:30 | 0 | 05 | Coude mirror M1 replaced |
| 78403501 | 2008 | 029 | 08:30 | 1 | 05.01 | Nd:YAG laser part service |
| 78403501 | 2007 | 347 | 08:30 | 0 | 05.02 | 2kHz Nd:VAN maintenance |
| 78403501 | 2007 | 307 | 08:30 | 2 | 08.01 | DG535 left in wrong state after tests, corrected after 1 day. |
| 78403501 | 2007 | 284 | 08:30 | 0 | 05.02 | 2kHz Nd:VAN start diode moved |
| 78403501 | 2007 | 281 | 08:30 | 0 | 05.02 | 2kHz Nd:VAN maintenance |
| 78403501 | 2007 | 250 | 08:30 | 1 | 06.01.07 | C-SPAD fitted, output sent through Lecroy |
| 78403501 | 2007 | 229 | 08:30 | 0 | 08.01 | Cable change, Lecroy taken out of stop chain |
| 78403501 | 2007 | 227 | 08:30 | 0 | 08.01 | Adjustment to cables used |
| 78403501 | 2007 | 218 | 08:30 | 1 | 08.01 | Start signal moved to different Lecroy discriminator block |
| 78403501 | 2007 | 204 | 08:30 | 1 | 05.01 | New Nd:YAG start diode and cable fitted |
| 78403501 | 2007 | 198 | 08:30 | 0 | 05.01 | Nd:YAG maintenance |
| 78403501 | 2007 | 187 | 08:30 | 1 | 06.01.07 | SPAD-3B installed for tests |
| 78403501 | 2007 | 102 | 08:30 | 0 | 05.01 | Nd:YAG maintenance |
| 78403501 | 2007 | 022 | 08:30 | 0 | 05.01 | Nd:YAG maintenance |
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