Skip to Content

Changes for page ANU Seismic Data Loggers

Last modified by robert on 2025/06/27 16:42
From version 43.1
edited by robert
on 2025/03/03 18:26
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

Page properties
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.
... ... @@ -76,26 +76,17 @@
76 76  
77 77  This menu also displays the firmware version, battery, external, and solar voltages, and the temperature of the system.
78 78  
79 -==== Upon setup ====
96 +* Check all Initialisation Parameters are marked as successful.
97 +* Check that solar voltage is above 10 V, otherwise the station will not last long.
80 80  
81 -- Check all Initialisation Parameters are marked as successful.
82 -
83 -- Check that solar voltage is above 10 V, otherwise the station will not last long.
84 -
85 -
86 86  == Live Seismometer Data ==
87 87  
88 88  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.
89 89  
90 -==== Upon setup ====
103 +* Check that all 3 channels are present and are producing a signal.
104 +* Stomp on the ground near where the sensor is installed to check that a signal is being picked up by all 3 channels.
105 +* Common representations of poor signals include channels sloping smoothly from high values to zero, or sharp corners in the plots.
91 91  
92 -- Check that all 3 channels are present and are producing a signal.
93 -
94 -- Stomp on the ground near where the sensor is installed to check that a signal is being picked up by all 3 channels.
95 -
96 -- Common representations of poor signals include channels sloping smoothly from high values to zero, or sharp corners in the plots.
97 -
98 -
99 99  == GPS Data ==
100 100  
101 101  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.
... ... @@ -102,12 +102,10 @@
102 102  
103 103  * Check that the station is connected to satellites
104 104  
105 -
106 106  == SD Information ==
107 107  
108 108  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.
109 109  
110 -
111 111  == System Configuration ==
112 112  
113 113  This menu is used to set the stations identifiers and parameters.
... ... @@ -151,20 +151,19 @@
151 151  
152 152  = Instrument Response =
153 153  
154 -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).
155 155  
156 156  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.
157 157  
158 158  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).
159 159  
160 -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') )
161 161  
162 162  
163 -= ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) =
169 += ANU TerraSAWR (Gen 3, FW 3.5a, 2017- current) =
164 164  
165 165  Words to describe the TSAWR would go here, if needed
166 166  
167 - 
168 168  
169 169  
170 170  = ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
... ... @@ -172,9 +172,9 @@
172 172  Ditto the mighty LPR!
173 173  
174 174  
175 -= ANU "ANUSR" (Gen 1, 2003? - 2013?) =
180 += ANU "ANUSR" (Gen 1, 2003? - 2012) =
176 176  
177 -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.
178 178  
179 179  
180 180  = References =
... ... @@ -192,6 +192,9 @@
192 192  )))
193 193  
194 194  
200 +
201 +
202 +
195 195  (% class="box" %)
196 196  (((
197 197  = TerraSAWR Specs =
... ... @@ -204,12 +204,13 @@
204 204  [[image:1704864886951-793.jpg]]
205 205  
206 206  |=Size (L x W x H)|30 x 25 x12cm
207 -|=Weight (with battery)| ~*~*1.9kg (2.5kg)
215 +|=Weight (with battery)| 1.9kg (2.5kg)
208 208  |=Battery|(((
209 -Lead-acid 12v, ~~7Ah
217 +Lead-acid 12v, ~~7-9Ah
210 210  
211 211  Rechargeable
212 212  )))
221 +|=Current Firmware|3.5a (Jan 2025)
213 213  
214 214  [[image:terrasawr battery.jpg]]
215 215  )))
... ... @@ -226,13 +226,18 @@
226 226  [[image:LPR 3.jpg]]
227 227  
228 228  |=Size (L x W x H)|42 x 34 x17 cm
229 -|=Weight (with battery)|4.9 kg (7.3 kg)
238 +|=Weight (no battery)|5.5 kg
230 230  |=Battery|(((
231 -LiFePo4 140Ah
240 +NOW: Any 12v battery with tab connections that will fit (ex. the same TSAWR battery)
232 232  
233 -Rechargeable
242 +DISCONTINUED: LiFePo4 140Ah Rechargeable (shown below).
234 234  )))
244 +|=Current Firmware|(((
245 +2.6a (old GPS modules) / 2.7a
235 235  
247 +Jan 2025
248 +)))
249 +
236 236  [[image:LPR battery.jpg]]
237 237  )))
238 238  )))