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Changes for page ANU Seismic Data Loggers

Last modified by robert on 2026/02/19 15:45
From version 71.2
edited by robert
on 2026/02/11 16:20
Change comment: There is no comment for this version
To version 67.1
edited by robert
on 2025/09/16 13:22
Change comment: There is no comment for this version

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17 17  At 100 Hz and with a GPS cable connected these loggers draw about 220 mW of power once the screen is off (higher sample rates draw more power but only marginally, < 5 mW). Adding a sensor (e.g. a Trillium Compact 120) increases this to approximately 400 mW, or 0.4 volt-amps. So, in theory 7 Ah battery should last about 10 days without a solar panel, but in practice it seems to be a bit closer to 8 which may be due to variability in power drain while in getting GPS locks.
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19 -For very sunny environments (latitudes < 30) a 20 Volt, 10 Watt solar panel should have no issue keeping these loggers alive over the summer months, and assuming unobstructed skies should also be fine over winter. **However** when possible a 20 Watt pane works best, especially as they usually cost only $10-20 more these days.
19 +For very sunny environments (latitudes < 30) a 20 Volts 10 Watt solar panel should have no issue keeping these loggers alive over the summer months, and assuming unobstructed skies should also be fine over winter. However there is no harm in using 20 or even a 40 Watt panel, especially for high latitudes, coastal regions, or areas without a full sky view. In theory up to a 60 Watt solar panel is fine, but we don't recommend anything over 40 Watts and that amount of power is already overkill.
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21 -40 Watt panels can also be used, and may be needed for extreme climates, or areas without a full sky view. 60 Watt panels have also been known to work, but this is now reaching the the limit of what the loggers can reasonably handle for extended periods and are not recommended for long term deploys.
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23 23  (% class="box infomessage" %)
24 24  (((
25 25  Power issues are easy and cheap to solve relative to the cost of your experiment, don't skimp!
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219 219  For the most part, the data logger response essentially flat when the samplerate output is set to 100 Hz or less and for seismological purposes is likely to be impossible to detect below 20 Hz regardless.
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221 -Instrument response can be downloaded from IRIS [[Nominal Response Library>>https://ds.iris.edu/ds/nrl/datalogger/anurses]] if need be, or [[directly from us>>http://auspass.edu.au/data/logger_response]] , or by downloading the response of an equivalent sensor at AusPass (e.g. get_stations(level='response') ).
219 +Instrument response can be downloaded from IRIS [[Nominal Response Library>>https://ds.iris.edu/ds/nrl/]] if need be, or [[directly from us>>http://auspass.edu.au/data/logger_response]] , or by downloading the response of an equivalent sensor at AusPass (e.g. get_stations(level='response') ).
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224 224  [[Amplitude and phase response for ANU logger at 50 Hz>>image:ANU_50hz_response.png||data-xwiki-image-style-alignment="center" height="356" width="475"]]
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241 241  Earliest known model is dated May 2011 (but first deployed November 2012) and still in use today. Potentially capable of housing much larger batteries than the TSAWR due to the larger cavity space.
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243 -We have found that the older LPR SD card slots can sometimes fail such that the data cards prematurely "pop out" during recording, which can be catastrophic. This seems to mostly occur in periods of hot weather, but not always. We have developed a small add-on that screws into the nearby serial port that effectively holds the cards in place and will ship included with these loggers. Screw the device in firmly, then **gently** slide over a pre-inserted card until it is flush with the top of the card. It probably won't slide over all the way and that's by design. Take care not to force the depress the card inadvertently (although testing has shown it will still record).
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245 - [[image:LPR_card_adaptors.jpg||alt="image of the LPR SD-card adapter"]]
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247 247  = ANU "ANUSR" (Gen 1, 2003? - 2012) =
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249 249  This logger has been retired for a long time and has a different instrument response. It used modular component boards and was powered via an acrylic case of 6 x 6V lantern batteries. There is a somewhat complete one above the CAT lab door if anyone is so inclined to have a look.
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295 295  (% class="box" %)
296 296  (((
297 297  = TerraSAWR Specs =
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360 360  )))
LPR_card_adaptors.jpg
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