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Changes for page ANU Seismic Data Loggers

Last modified by robert on 2025/06/27 16:42
From version 45.1
edited by robert
on 2025/04/24 13:38
Change comment: There is no comment for this version
To version 46.2
edited by robert
on 2025/06/15 13:57
Change comment: There is no comment for this version

Summary

Details

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Content
... ... @@ -10,6 +10,11 @@
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. For very sunny environments (latitudes < 30) a 10 Watt solar panel should suffice, however there is no harm in using 20 or even a 40 Watt panel. We generally recommend 20 Watt panels with at least a 7 Ah battery.
16 +
17 +
13 13  = Data Card Formatting and Information =
14 14  
15 15  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.
... ... @@ -20,15 +20,17 @@
20 20  
21 21  {{{XXX195G0100010034864 2 }}}
22 22  
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).
28 +//corresponding to//
31 31  
30 + site **XXX19**,
31 + network **5G**,
32 + sample rate **0100**, (i.e. 100 Hz)
33 + "gps interval" **01** (once per hour~-~- don't change),
34 + start mode (always **0**),
35 + stop mode (always **0**),
36 + seismometer type (**3** = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V),
37 + and seismometer serial number (**4864**).
38 +
32 32  (% class="box warningmessage" %)
33 33  (((
34 34  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)
... ... @@ -65,7 +65,17 @@
65 65   32Gb card: 122 days @ 250hz or 305 days @ 100hz
66 66  }}}
67 67  
75 +== Default Settings ==
68 68  
77 +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.
78 +
79 +* XX.ANUSR network and station name
80 +* 100 Hz Sample Rate
81 +* 40V pp (or +/- 20 V) gain / Trillium Compact seismometer version
82 +* Record on Restart enabled
83 +
84 +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.
85 +
69 69  = Logger Menus Overview (and setup) =
70 70  
71 71  The same menus are used in both the TSAWR and LPR-200 loggers.
... ... @@ -140,16 +140,16 @@
140 140  
141 141  = Instrument Response =
142 142  
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).
160 +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).
144 144  
145 145  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.
146 146  
147 147  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).
148 148  
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') )
166 +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') )
150 150  
151 151  
152 -= ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) =
169 += ANU TerraSAWR (Gen 3, FW 3.5a, 2017- current) =
153 153  
154 154  Words to describe the TSAWR would go here, if needed
155 155  
... ... @@ -160,9 +160,9 @@
160 160  Ditto the mighty LPR!
161 161  
162 162  
163 -= ANU "ANUSR" (Gen 1, 2003? - 2013?) =
180 += ANU "ANUSR" (Gen 1, 2003? - 2012) =
164 164  
165 -This logger has been retired for a long time and has a different instrument response.
182 +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.
166 166  
167 167  
168 168  = References =
... ... @@ -181,6 +181,8 @@
181 181  
182 182  
183 183  
201 +
202 +
184 184  (% class="box" %)
185 185  (((
186 186  = TerraSAWR Specs =
... ... @@ -195,10 +195,11 @@
195 195  |=Size (L x W x H)|30 x 25 x12cm
196 196  |=Weight (with battery)| 1.9kg (2.5kg)
197 197  |=Battery|(((
198 -Lead-acid 12v, ~~7Ah
217 +Lead-acid 12v, ~~7-9Ah
199 199  
200 200  Rechargeable
201 201  )))
221 +|=Current Firmware|3.5a (Jan 2025)
202 202  
203 203  [[image:terrasawr battery.jpg]]
204 204  )))
... ... @@ -217,11 +217,16 @@
217 217  |=Size (L x W x H)|42 x 34 x17 cm
218 218  |=Weight (no battery)|5.5 kg
219 219  |=Battery|(((
220 -LiFePo4 140Ah
240 +NOW: Any 12v battery with tab connections that will fit (ex. the same TSAWR battery)
221 221  
222 -Rechargeable
242 +DISCONTINUED: LiFePo4 140Ah Rechargeable (shown below).
223 223  )))
244 +|=Current Firmware|(((
245 +2.6a (old GPS modules) / 2.7a
224 224  
247 +Jan 2025
248 +)))
249 +
225 225  [[image:LPR battery.jpg]]
226 226  )))
227 227  )))