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Changes for page ANU Seismic Data Loggers

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

Summary

Details

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Content
... ... @@ -10,11 +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. 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 -
18 18  = Data Card Formatting and Information =
19 19  
20 20  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.
... ... @@ -25,17 +25,15 @@
25 25  
26 26  {{{XXX195G0100010034864 2 }}}
27 27  
28 -//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).
29 29  
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 -
39 39  (% class="box warningmessage" %)
40 40  (((
41 41  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)
... ... @@ -72,17 +72,7 @@
72 72   32Gb card: 122 days @ 250hz or 305 days @ 100hz
73 73  }}}
74 74  
75 -== Default Settings ==
76 76  
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 -
86 86  = Logger Menus Overview (and setup) =
87 87  
88 88  The same menus are used in both the TSAWR and LPR-200 loggers.
... ... @@ -157,16 +157,16 @@
157 157  
158 158  = Instrument Response =
159 159  
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).
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).
161 161  
162 162  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.
163 163  
164 164  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).
165 165  
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') )
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') )
167 167  
168 168  
169 -= ANU TerraSAWR (Gen 3, FW 3.5a, 2017- current) =
152 += ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) =
170 170  
171 171  Words to describe the TSAWR would go here, if needed
172 172  
... ... @@ -177,9 +177,9 @@
177 177  Ditto the mighty LPR!
178 178  
179 179  
180 -= ANU "ANUSR" (Gen 1, 2003? - 2012) =
163 += ANU "ANUSR" (Gen 1, 2003? - 2013?) =
181 181  
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.
165 +This logger has been retired for a long time and has a different instrument response.
183 183  
184 184  
185 185  = References =
... ... @@ -198,8 +198,6 @@
198 198  
199 199  
200 200  
201 -
202 -
203 203  (% class="box" %)
204 204  (((
205 205  = TerraSAWR Specs =
... ... @@ -214,11 +214,10 @@
214 214  |=Size (L x W x H)|30 x 25 x12cm
215 215  |=Weight (with battery)| 1.9kg (2.5kg)
216 216  |=Battery|(((
217 -Lead-acid 12v, ~~7-9Ah
198 +Lead-acid 12v, ~~7Ah
218 218  
219 219  Rechargeable
220 220  )))
221 -|=Current Firmware|3.5a (Jan 2025)
222 222  
223 223  [[image:terrasawr battery.jpg]]
224 224  )))
... ... @@ -237,16 +237,11 @@
237 237  |=Size (L x W x H)|42 x 34 x17 cm
238 238  |=Weight (no battery)|5.5 kg
239 239  |=Battery|(((
240 -NOW: Any 12v battery with tab connections that will fit (ex. the same TSAWR battery)
220 +LiFePo4 140Ah
241 241  
242 -DISCONTINUED: LiFePo4 140Ah Rechargeable (shown below).
222 +Rechargeable
243 243  )))
244 -|=Current Firmware|(((
245 -2.6a (old GPS modules) / 2.7a
246 246  
247 -Jan 2025
248 -)))
249 -
250 250  [[image:LPR battery.jpg]]
251 251  )))
252 252  )))