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Changes for page ANU Seismic Data Loggers

Last modified by robert on 2025/08/08 16:09
From version 52.1
edited by Jack Dent
on 2025/07/22 11:17
Change comment: There is no comment for this version
To version 46.1
edited by robert
on 2025/04/24 14:58
Change comment: There is no comment for this version

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1 -XWiki.JackD
1 +XWiki.robert
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10 10  )))
11 11  )))
12 12  
13 -= Power Considerations =
14 -
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 -
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.
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.
20 -
21 -(% class="box infomessage" %)
22 -(((
23 -Power issues are easy and cheap to solve relative to the cost of your experiment, don't skimp!
24 -)))
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
28 -
29 29  = Data Card Formatting and Information =
30 30  
31 31  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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32 32  
33 33  The loggers can be "pre-programmed" with information (e.g. site name, sampling rate, etc) or they can be programmed in the field using the buttons on the logger. To pre-program the cards you simply edit a text file (named "[[ANUSRSetup.txt>>http://auspass.edu.au/field/ANUSRSetup.txt]]" for the LPRs, or "[[tSAWRSetup.txt>>http://auspass.edu.au/field/tSAWRSetup.txt]]" for the TerraSAWRs) and place it in the root directory on the SDCard. When the logger boots up, it will parse and load this information.
34 34  
35 -== The format for ANUSRSetup.txt / LPR200s will be a single line of text that looks like this: ==
19 +=== The format for ANUSRSetup.txt / LPR200s will be a single line of text that looks like this: ===
36 36  
37 37  {{{XXX195G0100010034864 2 }}}
38 38  
39 -//corresponding to//
23 +corresponding to site XXX19,
24 + network 5G,
25 + sample rate 0100, (i.e. 100 Hz)
26 + "gps interval" 01 (once per hour~-~- don't change),
27 + start mode (always 0),
28 + stop mode (always 0),
29 + seismometer type (3 = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V),
30 + and seismometer serial number (4864).
40 40  
41 - site **XXX19**,
42 - network **5G**,
43 - sample rate **0100**, (i.e. 100 Hz)
44 - "gps interval" **01** (once per hour~-~- don't change),
45 - start mode (always **0**),
46 - stop mode (always **0**),
47 - seismometer type (**3** = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V),
48 - and seismometer serial number (**4864**).
49 -
50 50  (% class="box warningmessage" %)
51 51  (((
52 52  NOTE: the 2 at the very end is for "RECORD ON RESTART". The record on restart option ensures that if the logger dies and is powered back up whilst in the field (due to battery charging cycles or other causes) that the recording will resume. (# of blank spaces before this doesn't matter)
53 53  )))
54 54  
55 -== The format for TSAWR loggers is shorter: ==
37 +=== The format for TSAWR loggers is shorter: ===
56 56  
57 57  (% class="box errormessage" %)
58 58  (((
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71 71   and seismometer serial number (9999).
72 72  
73 73  
74 -== The formatting process using the logger: ==
56 +=== The formatting process using the logger: ===
75 75  
76 76  The process for formatting an SD card within the logger is straightforward. Navigate to the "SD INFORMATION" screen and press ERASE SD CARD. This process may take up to a minute. This will result in erasing all files from the card. Upon starting recording, a new 'seed' will be written containing all the information that the logger has been set with FINISH THIS SECTION
77 77  
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83 83   32Gb card: 122 days @ 250hz or 305 days @ 100hz
84 84  }}}
85 85  
86 -== Default Settings ==
87 87  
88 -As of 2025, the default settings for both LPR (v. 2.7) and TSWAR (v 3.6a) loggers are below. If you're using a broadband instrument, you are essentially good to go without having to program the cards.
89 -
90 -* XX.ANUSR network and station name
91 -* 100 Hz Sample Rate
92 -* 40V pp (or +/- 20 V) gain / Trillium Compact seismometer version
93 -* Record on Restart enabled
94 -
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.
96 -
97 97  = Logger Menus Overview (and setup) =
98 98  
99 99  The same menus are used in both the TSAWR and LPR-200 loggers.
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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.
143 +Both the TerraSAWR and LPR-200 use the same ADS1281 analog-to-digital converter chip and are designed to have identical instrument response. Depending on the output sample rate (e.g. 100 Hz, 250 Hz, 500 Hz, 1000 Hz) amplitude response is consistently flat up to ~~100 Hz but phase response can vary above 1 Hz at 100 Hz (or 10 Hz at 250 Hz).
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}}
145 +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.
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.
147 +Another important thing to note is that the group delay associated with late stage FIR filters is **automatically applied in the logger**, hence there is no need to apply this in the response. These tend to max out at 0.124 seconds for most output sampling rates (0.062 s for 100 Hz).
178 178  
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') ).
149 +Instrument response can be downloaded from IRIS-NRL (v2) if need be, 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) =
152 += ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) =
184 184  
185 -Not sure there's much left to say
154 +Words to describe the TSAWR would go here, if needed
186 186  
187 187  
188 188  
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191 191  Ditto the mighty LPR!
192 192  
193 193  
194 -= ANU "ANUSR" (Gen 1, 2003? - 2012) =
163 += ANU "ANUSR" (Gen 1, 2003? - 2013?) =
195 195  
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.
165 +This logger has been retired for a long time and has a different instrument response.
197 197  
198 198  
199 199  = References =
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213 213  
214 214  
215 215  
216 -
217 -
218 -
219 -
220 -
221 -
222 222  (% class="box" %)
223 223  (((
224 224  = TerraSAWR Specs =
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233 233  |=Size (L x W x H)|30 x 25 x12cm
234 234  |=Weight (with battery)| 1.9kg (2.5kg)
235 235  |=Battery|(((
236 -Lead-acid 12v, ~~7-9Ah
199 +Lead-acid 12v, ~~7Ah
237 237  
238 238  Rechargeable
239 239  )))
240 -|=Current Firmware|3.5a (Jan 2025)
241 241  
242 242  [[image:terrasawr battery.jpg]]
243 243  )))
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258 258  |=Battery|(((
259 259  NOW: Any 12v battery with tab connections that will fit (ex. the same TSAWR battery)
260 260  
261 -DISCONTINUED: LiFePo4 140Ah Rechargeable (shown below).
223 +DISCONTINUED: LiFePo4 140Ah Rechargeable
262 262  )))
263 -|=Current Firmware|(((
264 -2.6a (old GPS modules) / 2.7a
265 265  
266 -Jan 2025
267 -)))
268 -
269 269  [[image:LPR battery.jpg]]
270 270  )))
271 271  )))
TC120_ANU_vs_CENTAUR.png
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