Changes for page ANU Seismic Data Loggers
Last modified by robert on 2025/06/27 16:42
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... ... @@ -10,19 +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. 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 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. ... ... @@ -33,17 +33,15 @@ 33 33 34 34 {{{XXX195G0100010034864 2 }}} 35 35 36 -//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). 37 37 38 - site **XXX19**, 39 - network **5G**, 40 - sample rate **0100**, (i.e. 100 Hz) 41 - "gps interval" **01** (once per hour~-~- don't change), 42 - start mode (always **0**), 43 - stop mode (always **0**), 44 - seismometer type (**3** = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V), 45 - and seismometer serial number (**4864**). 46 - 47 47 (% class="box warningmessage" %) 48 48 ((( 49 49 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) ... ... @@ -80,17 +80,7 @@ 80 80 32Gb card: 122 days @ 250hz or 305 days @ 100hz 81 81 }}} 82 82 83 -== Default Settings == 84 84 85 -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. 86 - 87 -* XX.ANUSR network and station name 88 -* 100 Hz Sample Rate 89 -* 40V pp (or +/- 20 V) gain / Trillium Compact seismometer version 90 -* Record on Restart enabled 91 - 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. 93 - 94 94 = Logger Menus Overview (and setup) = 95 95 96 96 The same menus are used in both the TSAWR and LPR-200 loggers. ... ... @@ -165,18 +165,18 @@ 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. Depending on the output sample rate (e.g. 100 Hz, 250 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). 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). 169 169 170 170 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. 171 171 172 172 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). 173 173 174 -Instrument response can be downloaded from IRIS-NRL (v2) **TODO ADD LINK**if need be, 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') ) 175 175 176 176 177 -= ANU TerraSAWR (Gen 3, FW 3.5a, 2017- current) = 152 += ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) = 178 178 179 - Not sure there'smuchlefttosay154 +Words to describe the TSAWR would go here, if needed 180 180 181 181 182 182 ... ... @@ -185,9 +185,9 @@ 185 185 Ditto the mighty LPR! 186 186 187 187 188 -= ANU "ANUSR" (Gen 1, 2003? - 201 2) =163 += ANU "ANUSR" (Gen 1, 2003? - 2013?) = 189 189 190 -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. 191 191 192 192 193 193 = References = ... ... @@ -206,8 +206,6 @@ 206 206 207 207 208 208 209 - 210 - 211 211 (% class="box" %) 212 212 ((( 213 213 = TerraSAWR Specs = ... ... @@ -222,11 +222,10 @@ 222 222 |=Size (L x W x H)|30 x 25 x12cm 223 223 |=Weight (with battery)| 1.9kg (2.5kg) 224 224 |=Battery|((( 225 -Lead-acid 12v, ~~7 -9Ah198 +Lead-acid 12v, ~~7Ah 226 226 227 227 Rechargeable 228 228 ))) 229 -|=Current Firmware|3.5a (Jan 2025) 230 230 231 231 [[image:terrasawr battery.jpg]] 232 232 ))) ... ... @@ -245,16 +245,11 @@ 245 245 |=Size (L x W x H)|42 x 34 x17 cm 246 246 |=Weight (no battery)|5.5 kg 247 247 |=Battery|((( 248 - NOW: Any 12v battery with tab connectionsthat will fit (ex. the same TSAWR battery)220 +LiFePo4 140Ah 249 249 250 - DISCONTINUED: LiFePo4 140AhRechargeable(shown below).222 +Rechargeable 251 251 ))) 252 -|=Current Firmware|((( 253 -2.6a (old GPS modules) / 2.7a 254 254 255 -Jan 2025 256 -))) 257 - 258 258 [[image:LPR battery.jpg]] 259 259 ))) 260 260 )))