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Changes for page ANU Seismic Data Loggers

Last modified by robert on 2025/08/08 16:09
From version 53.1
edited by Jack Dent
on 2025/07/22 13:13
Change comment: There is no comment for this version
To version 61.1
edited by robert
on 2025/08/07 16:41
Change comment: There is no comment for this version

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1 -XWiki.JackD
1 +XWiki.robert
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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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24 24  )))
25 25  
26 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 for a more comprehensive overview of this kind of setup)
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 28  
29 29  = Data Card Formatting and Information =
30 30  
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89 89  
90 90  * XX.ANUSR network and station name
91 91  * 100 Hz Sample Rate
92 -* 40V pp (or +/- 20 V) gain / Trillium Compact seismometer version
92 +* 40 Vpp (or +/- 20 V) gain / Trillium Compact seismometer version
93 93  * Record on Restart enabled
94 94  
95 95  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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104 104  
105 105  This menu also displays the firmware version, battery, external, and solar voltages, and the temperature of the system.
106 106  
107 -* Check all Initialisation Parameters are marked as successful.
108 -* 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.
109 109  
110 110  == Live Seismometer Data ==
111 111  
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119 119  
120 120  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.
121 121  
122 -* 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.
123 123  
124 124  == SD Information ==
125 125  
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137 137  
138 138  The seismometer model and serial number (up to 10 characters) can be set. Seismometer model options include:
139 139  
140 -* Trillium Compact (same for 20 and 120)
140 +* Trillium Compact (same for 20s and 120s models)
141 141  * CMG - 3ESP
142 142  * Guralp 40T
143 143  * LE-3D Lite
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152 152  
153 153  (% class="box errormessage" %)
154 154  (((
155 -NOTE: Ensure the 'RECORD ON RESTART' option is marked with a cross.
155 +Again, ensure the 'RECORD ON RESTART' option is marked with a cross (the default setting). This ensures that the logger will record any time it receives enough power!
156 156  )))
157 157  
158 158  (% class="wikigeneratedid" %)
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168 168  
169 169  = Instrument Response =
170 170  
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.
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 better or worse!).
172 172  
173 -{{info}}
174 -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
175 -{{/info}}
173 +//(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.)//
176 176  
177 -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.
175 +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.
178 178  
177 +In the logger's menu, 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.
178 +
179 179  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') ).
180 180  
181 -[[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"]]
182 182  
183 -= 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"]]
184 184  
185 -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"]]
186 186  
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"]]
187 187  
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"]]
188 188  
189 -= ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
190 190  
191 -Ditto the mighty LPR!
191 +[[Huddle test comparing a Trillium Compact 120 + TerraSAWR vs a Trillium Compact 120 + Nanometrics Centaur (M8.AUANU) at 100 Hz>>image:TC120_ANU_vs_CENTAUR.png||data-xwiki-image-style-alignment="center"]]
192 192  
193 += ANU TerraSAWR (Gen 3, FW 3.5a, 2014- current) =
193 193  
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 +
194 194  = ANU "ANUSR" (Gen 1, 2003? - 2012) =
195 195  
196 196  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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220 220  
221 221  
222 222  
230 +
231 +
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233 +
234 +
235 +
236 +
237 +
223 223  (% class="box" %)
224 224  (((
225 225  = TerraSAWR Specs =
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270 270  [[image:LPR battery.jpg]]
271 271  )))
272 272  )))
288 +
289 +
290 +
291 +
273 273  )))
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