Changes for page ANU Seismic Data Loggers
Last modified by robert on 2025/08/08 16:09
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... ... @@ -10,22 +10,6 @@ 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, < 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 - 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 - 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 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 - 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. ... ... @@ -32,177 +32,74 @@ 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// 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 -(% class="box warningmessage" %) 51 -((( 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 -))) 54 - 55 -== The format for TSAWR loggers is shorter: == 56 - 57 -(% class="box errormessage" %) 58 -((( 59 -**NOTE: The format is shorter as they don't have an option to set the "GPS sync". The GPS sync number should be omitted otherwise the formatting will not work!** 60 -))) 61 - 62 -SITE15G02500039999 2 63 - 64 -corresponding to site SITE1, 65 - 66 - network 5G 67 - sample rate 0250, (i.e. 250 Hz) 23 +corresponding to site XXX19, 24 + network 5G, 25 + sample rate 0100, (e.g. 100 hz) 26 + "gps interval" 01 (once per hour~-~- don't change), 68 68 start mode (always 0), 69 69 stop mode (always 0), 70 - seismometer type (3 = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V), 71 - and seismometer serial number (9999). 29 + seismometer type (3 = broadband (+/- 20V), 1 = shortperiod (+/- 5V), 30 + and seismometer serial number (4864). 31 + the 2 at the very end is for "start recording on power" 32 + and is vital to have this set so the logger will resume recording on its own if it experiences a power cycle. (# of blank spaces before this doesn't matter) 72 72 34 +the TSAWRs are a bit shorter as they don't have an option to set the "gps sync" 73 73 74 - ==Theformattingprocessusingthelogger:==36 +{{{SITE1XX02500039999 2}}} 75 75 76 - The process for formatting an SDcard withinthe logger is straightforward. Navigate tothe "SD INFORMATION" screen andpress ERASE SD CARD. This process maytakeuptoaminute.This willresultin erasing allfilesfromthe card. Upon startingrecording,a new 'seed' will be written containing alltheinformationthattheloggerhas been setwith FINISH THIS SECTION38 +which would set up a Trillium Compact with serial 9999 named XX.SITE1 at 250hz sample rate. 77 77 78 -[[image:original_0747763c-e3dd-4667-b897-833f12c8e0b8_20241219_130604.jpg||height="240" width="298"]] 79 79 80 80 Here is a general guideline for how much data you can expect to fit on a card: 81 81 82 82 {{{ 64Gb card: 245 days @ 250hz or 610 days @ 100hz 83 - 32Gb card: 122 days @ 250hz or 305 days @ 100hz 84 -}}} 44 + 32Gb card: 122 days @ 250hz or 305 days @ 100hz}}} 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 89 90 -* XX.ANUSR network and station name 91 -* 100 Hz Sample Rate 92 -* 40 Vpp (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 -= Logger Menus Overview (and setup) = 98 - 99 -The same menus are used in both the TSAWR and LPR-200 loggers. 100 - 101 -== System Information == 102 - 103 -This menu provides an overview of the status of the station. Under 'Initialisation Parameters', the status of systems that are initialised upon powering on the logger can be checked. 104 - 105 -This menu also displays the firmware version, battery, external, and solar voltages, and the temperature of the system. 106 - 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 - 110 -== Live Seismometer Data == 111 - 112 -This screen displays real time seismometer data for all 3 axes of the seismometer. Initially, a plot of raw data from all 3 channels is shown. By pressing enter, a high pass filter can be applied showing a more useful plot of all channels. The up and down arrows can be used to change between a view of all channels, individual channels, and all channels on different X axes. 113 - 114 -* Check that all 3 channels are present and are producing a signal. 115 -* Stomp on the ground near where the sensor is installed to check that a signal is being picked up by all 3 channels. 116 -* Common representations of poor signals include channels sloping smoothly from high values to zero, or sharp corners in the plots. 117 - 118 -== GPS Data == 119 - 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 - 122 -* Check that the station is connected to satellites. 3 or more should be perfectly adequate to keep time. 123 - 124 -== SD Information == 125 - 126 -The menu lists if the SD card has been initialised, as well as the capacity and space free on the memory card. See "Data card formatting" (above) to see how to format and initialise the inserted SD card. 127 - 128 -== System Configuration == 129 - 130 -This menu is used to set the stations identifiers and parameters. 131 - 132 -First, the sampling rate can be chosen from a set of options (1 Hz, 10 Hz, 25 Hz, 40 Hz, 50 Hz, 100 Hz, 250 Hz, 1000 Hz). 133 - 134 -Next, the station identifier (up to 5 characters) and the network code (2 characters) can be set. 135 - 136 -Record start and stop mode should be left to 'On Request' mode. 137 - 138 -The seismometer model and serial number (up to 10 characters) can be set. Seismometer model options include: 139 - 140 -* Trillium Compact (same for 20s and 120s models) 141 -* CMG - 3ESP 142 -* Guralp 40T 143 -* LE-3D Lite 144 -* Mark L4C 145 -* Mark L4 146 - 147 -Additionally, the following settings can be used in place of the seismometer model types: +/- 20V, +/- 10V, +/- 5V 148 - 149 -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. 150 - 151 -* Set the sampling rate, station identifier, and network code. Set the appropriate seismometer type. Most importantly, ensure the record on restart setting is checked. 152 - 153 -(% class="box errormessage" %) 154 -((( 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 -))) 157 - 158 -(% class="wikigeneratedid" %) 159 -[[image:original_2b83fcf5-ee5a-4375-bab1-2d738e4ffe8c_20241219_130646.jpg||height="234" width="289"]] 160 - 161 -== STA/LTA Configuration == 162 - 163 -The Short Term Average and Long Term Average Configuration screen.. this is a relic for when people weren't recording continuously. Not advised! 164 - 165 165 = LogFile Conversion Script = 166 166 167 167 Both the TSAWR and LPR-200 write logging information as a binary "dat" file which includes GPS time syncs, temperatures, battery power, and position. To convert them into ASCII you can read, use [[THIS PYTHON SCRIPT>>http://auspass.edu.au/field/anusr_log.py]]. 168 168 169 -= Instrument Response = 170 170 171 - BoththeTerraSAWRand 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 originallysamples 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 below250Hz, a final "pure" /5 decimation is done without any sort of FIR filter(for better or worse!).53 += ANU TerraSAWR (Gen 3, 2017?- current) = 172 172 173 - //(The600+ Stage 3 SINC coefficients during the initial 1024k > 16k decimation were left off as they slowed down the processx10 and contributeat most 0.3 db amplitude and 0.31 ms phasedelay 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.)//55 +Text here 174 174 175 - Forthe mostpart, the data loggerresponse essentially flat whenthe samplerate output is set to 100 Hz or less and for seismological purposes is likely to be impossible to detect below 20 Hz regardless.57 +== Sub-paragraph == 176 176 177 - 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.59 +XXXX 178 178 179 - Instrumentresponse can be downloaded from IRIS[[Nominal Response Library>>https://ds.iris.edu/ds/nrl/]] if needbe, or [[directly from us>>http://auspass.edu.au/data/logger_response]] , or by downloadingtheresponse ofan equivalent sensor at AusPass (e.g. get_stations(level='response')).61 +== Sub-paragraph == 180 180 63 +xx 181 181 182 - [[Amplitudeand phaseresponse for ANU loggerat 50 Hz>>image:ANU_50hz_response.png||data-xwiki-image-style-alignment="center"height="356"width="475"]]65 +=== Sub-sub paragraph === 183 183 184 - [[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"]]67 +x 185 185 186 -[[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 - [[Amplitudeand phase response forANUlogger at 1000Hz>>image:ANU_1000hz_response.png||data-xwiki-image-style-alignment="center"height="367" width="489"]]70 += ANU LPR-200 (Gen 2, 2013 - current) = 189 189 72 +Text here 190 190 191 - [[Huddletest 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"]]74 +== Sub-paragraph == 192 192 193 - = ANU TerraSAWR (Gen 3, FW 3.5a, 2014- current) =76 +x 194 194 195 - Earliestknown model is dated July 2014 (though first deployed in 2019)and ourcurrent flagshipmodel. Lightweightand small.78 +== Sub-paragraph == 196 196 197 - = ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2011 - current) =80 +x 198 198 199 -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. 200 200 201 -= ANU "ANUSR" (Gen 1, 2003? - 201 2) =83 += ANU "ANUSR" (Gen 1, 2003? - 2013?) = 202 202 203 - 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 6x6V lantern batteries. There is a somewhat complete one above the CAT lab door if anyone is so inclined to have a look.85 +x 204 204 205 - 206 206 = References = 207 207 208 208 * [[PDF Manual>>http://auspass.edu.au/field/LPR-200_Instruction_Manual.pdf]] ... ... @@ -218,23 +218,6 @@ 218 218 ))) 219 219 220 220 221 - 222 - 223 - 224 - 225 - 226 - 227 - 228 - 229 - 230 - 231 - 232 - 233 - 234 - 235 - 236 - 237 - 238 238 (% class="box" %) 239 239 ((( 240 240 = TerraSAWR Specs = ... ... @@ -247,13 +247,12 @@ 247 247 [[image:1704864886951-793.jpg]] 248 248 249 249 |=Size (L x W x H)|30 x 25 x12cm 250 -|=Weight (with battery)| 1.9kg (2.5kg) 114 +|=Weight (with battery)| ~*~*1.9kg (2.5kg) 251 251 |=Battery|((( 252 -Lead-acid 12v, ~~7 -9Ah116 +Lead-acid 12v, ~~7Ah 253 253 254 254 Rechargeable 255 255 ))) 256 -|=Current Firmware|3.5a (Jan 2025) 257 257 258 258 [[image:terrasawr battery.jpg]] 259 259 ))) ... ... @@ -270,19 +270,16 @@ 270 270 [[image:LPR 3.jpg]] 271 271 272 272 |=Size (L x W x H)|42 x 34 x17 cm 273 -|=Weight ( nobattery)|5.5kg136 +|=Weight (with battery)|4.9 kg (7.3 kg) 274 274 |=Battery|((( 275 - NOW: Any 12v battery with tab connectionsthat will fit (ex. the same TSAWR battery)138 +LiFePo4 140Ah 276 276 277 - DISCONTINUED: LiFePo4 140AhRechargeable(shown below).140 +Rechargeable 278 278 ))) 279 -|=Current Firmware|((( 280 -2.6a (old GPS modules) / 2.7a 281 281 282 -Jan 2025 283 -))) 284 - 285 285 [[image:LPR battery.jpg]] 286 286 ))) 287 287 ))) 288 288 ))) 147 + 148 +
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