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Changes for page ANU Seismic Data Loggers

Last modified by robert on 2025/08/08 16:09
From version 50.2
edited by robert
on 2025/06/30 19:26
Change comment: There is no comment for this version
To version 59.2
edited by robert
on 2025/08/06 18:54
Change comment: There is no comment for this version

Summary

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... ... @@ -14,9 +14,9 @@
14 14  
15 15  Both the LPR-200 (or "Low Power Recorder" 200) and TerraSAWR are designed to use as little power as possible, and more or less use the same amount of power.
16 16  
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, < 5mW). 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.
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.
18 18  
19 -For very sunny environments (latitudes < 30) a 20V 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.
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.
20 20  
21 21  (% class="box infomessage" %)
22 22  (((
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23 23  Power issues are easy and cheap to solve relative to the cost of your experiment, don't skimp!
24 24  )))
25 25  
26 +(% class="wikigeneratedid" %)
27 +In the case of an LPR, there is a large compartment for housing an internal battery, able to accommodate anything from a 10-30Ah battery. To use a standard lead acid battery with a positive and negative terminal, a 6 pin adaptor must be used. This ensures the voltage from the external power port (pins A and C) connect to the battery and ensure the system actually recharges. (See [[Peripheral Equipment>>doc:Instrumentation.Peripheral Equipment.WebHome]] for a more comprehensive overview of this kind of setup)
28 +
26 26  = Data Card Formatting and Information =
27 27  
28 28  Both the TerraSAWR and LPR-200 require SD Cards to be formatted in FAT32 filesystem. For 64Gb cards it can be difficult to format in FAT32, but [[software >>http://auspass.edu.au/field/fat32cardformatter.exe]]is available. ANU recommend SanDisk Extreme 150 mb/s cards in either 32 or 64Gb size. We strongly discourage using cards larger than 64Gb, and in general smaller cards are less likely to fail. We have also found that "adapter" cards (e.g. SD to microSD) are prone to having write issues and **strongly** advise against them.
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86 86  
87 87  * XX.ANUSR network and station name
88 88  * 100 Hz Sample Rate
89 -* 40V pp (or +/- 20 V) gain / Trillium Compact seismometer version
92 +* 40 Vpp (or +/- 20 V) gain / Trillium Compact seismometer version
90 90  * Record on Restart enabled
91 91  
92 92  Note that if a user sets the gain incorrectly, this can be fixed later (assuming nothing clipped) by multiplying or dividing by factors of 2. The gain setting can be looked up from the logfile, else you may have to guess from a PSD or other method.
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101 101  
102 102  This menu also displays the firmware version, battery, external, and solar voltages, and the temperature of the system.
103 103  
104 -* Check all Initialisation Parameters are marked as successful.
105 -* Check that solar voltage is above 10 V, otherwise the station will not last long.
107 +* Check that all //Initialisation Parameters// are marked as successful.
108 +* Check that solar voltage is above 10 V in the software, or preferrably physically check that the battery's voltage is increasing via a DMM.
106 106  
107 107  == Live Seismometer Data ==
108 108  
... ... @@ -116,7 +116,7 @@
116 116  
117 117  This menu displays the status of the stations' GPS connection. The screen lists; UTC time, UTC date, latitude, longitude, altitude, number of satellite connections, and SNR.
118 118  
119 -* Check that the station is connected to satellites
122 +* Check that the station is connected to satellites. 3 or more should be perfectly adequate to keep time.
120 120  
121 121  == SD Information ==
122 122  
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134 134  
135 135  The seismometer model and serial number (up to 10 characters) can be set. Seismometer model options include:
136 136  
137 -* Trillium Compact (same for 20 and 120)
140 +* Trillium Compact (same for 20s and 120s models)
138 138  * CMG - 3ESP
139 139  * Guralp 40T
140 140  * LE-3D Lite
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149 149  
150 150  (% class="box errormessage" %)
151 151  (((
152 -NOTE: Ensure the 'RECORD ON RESTART' option is marked with a cross.
155 +NOTE: Ensure the 'RECORD ON RESTART' option is marked with a cross. This ensures that the logger will record any time it receives enough power!
153 153  )))
154 154  
155 155  (% class="wikigeneratedid" %)
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165 165  
166 166  = Instrument Response =
167 167  
168 -Both the TerraSAWR and LPR-200 use the same ADS1281 analog-to-digital converter chip and are designed to have identical instrument response. The ADC (analog to digital) chip in both loggers originally samples at 1024000 Hz and downsamples towards the output data rate via a 5th order SINC filter, then another four FIR filters. If the output is below 250 Hz, a final "pure" /5 decimation is done without any sort of FIR filter.
171 +Both the TerraSAWR and LPR-200 use the same ADS1281 analog-to-digital converter chip and are designed to have identical instrument response. The ADC (analog to digital) chip in both loggers originally samples at 1024000 Hz and downsamples towards the output data rate via a 5th order SINC filter, then another four FIR filters. If the output is below 250 Hz, a final "pure" /5 decimation is done without any sort of FIR filter. 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.
169 169  
170 170  {{info}}
171 -The Stage 3 SINC coefficients (600+) during the initial 1024k > 16k decimation were left off as they slowed down the process x10 and contribute very little (< 0.3 db, < 0.31 ms) to the end result
174 +The 600+ Stage 3 SINC coefficients during the initial 1024k > 16k decimation were left off as they slowed down the process x10 and contribute at most 0.3 db amplitude and 0.31 ms phase delay discrepancies, and primarily only to frequencies near the nyquist. If for some reason you want to add this phase manually we can share the parameters with you.
172 172  {{/info}}
173 173  
174 174  The user can choose to apply a 2nd stage "sensor gain" by selecting an instrument type in the setup menu. This effectively selects a 10 Vpp (e.g. short period sensors), 20 Vpp, 40 Vpp (most broadband sensors) regime to match the sensor's sensitivity. This has the effect of doubling amplitude from 10v to 20v, or quadrupling from 10v to 40v. If you have set your sensor correctly (and the signal isn't clipped!) you can "correct" this by simply multiplying your data by 0.5 etc. This gain manifests itself in stage 2 in the response information.
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175 175  
176 176  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') ).
177 177  
178 -[[Huddle test comparing a Trillium Compact 120 + TerraSAWR vs a Trillium Compact 120 + Nanometrics Centaur (M8.AUANU)>>image:TC120_ANU_vs_CENTAUR.png||data-xwiki-image-style-alignment="center"]]
179 179  
180 -= ANU TerraSAWR (Gen 3, FW 3.5a, 2017- current) =
182 +[[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"]]
181 181  
182 -Not sure there's much left to say
184 +[[Amplitude and phase response for ANU logger at 100 Hz>>image:ANU_100hz_response.png||data-xwiki-image-style-alignment="center" height="355" width="473"]]
183 183  
186 +[[Amplitude and phase response for ANU logger at 250 Hz>>image:ANU_250hz_response.png||data-xwiki-image-style-alignment="center" height="359" width="479"]]
184 184  
188 +[[Amplitude and phase response for ANU logger at 1000 Hz>>image:ANU_1000hz_response.png||data-xwiki-image-style-alignment="center" height="367" width="489"]]
185 185  
186 -= ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
187 187  
188 -Ditto the mighty LPR!
191 +[[Huddle test comparing a Trillium Compact 120 + TerraSAWR vs a Trillium Compact 120 + Nanometrics Centaur (M8.AUANU)>>image:TC120_ANU_vs_CENTAUR.png||data-xwiki-image-style-alignment="center"]]
189 189  
193 += ANU TerraSAWR (Gen 3, FW 3.5a, 2014- current) =
190 190  
195 +Earliest known model is dated July 2014 (though first deployed in 2019) and our current flagship model. Lightweight and small.
196 +
197 += ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2011 - current) =
198 +
199 +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.
200 +
191 191  = ANU "ANUSR" (Gen 1, 2003? - 2012) =
192 192  
193 193  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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215 215  
216 216  
217 217  
228 +
229 +
230 +
231 +
232 +
233 +
234 +
235 +
236 +
218 218  (% class="box" %)
219 219  (((
220 220  = TerraSAWR Specs =
TC120_ANU_vs_CENTAUR.png
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