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Changes for page ANU Seismic Data Loggers

Last modified by robert on 2025/08/08 16:09
From version 47.1
edited by robert
on 2025/06/15 14:13
Change comment: There is no comment for this version
To version 28.1
edited by robert
on 2024/11/11 20:59
Change comment: There is no comment for this version

Summary

Details

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Content
... ... @@ -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.
... ... @@ -29,167 +29,84 @@
29 29  
30 30  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.
31 31  
32 -=== 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:
33 33  
34 34  {{{XXX195G0100010034864 2 }}}
35 35  
36 -//corresponding to//
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 -(% class="box warningmessage" %)
48 -(((
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)
50 -)))
51 -
52 -=== The format for TSAWR loggers is shorter: ===
53 -
54 -(% class="box errormessage" %)
55 -(((
56 -**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!**
57 -)))
58 -
59 -SITE15G02500039999 2
60 -
61 -corresponding to site SITE1, 
62 -
63 - network 5G
64 - 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),
65 65   start mode (always 0),
66 66   stop mode (always 0),
67 - seismometer type (3 = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V),
68 - 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)
69 69  
34 +the TSAWRs are a bit shorter as they don't have an option to set the "gps sync"
70 70  
71 -=== The formatting process using the logger: ===
36 +{{{SITE1XX02500039999 2}}}
72 72  
73 -The process for formatting an SD card within the logger is straightforward. Navigate to the "SD INFORMATION" screen and press ERASE SD CARD. This process may take up to a minute. This will result in erasing all files from the card. Upon starting recording, a new 'seed' will be written containing all the information that the logger has been set with FINISH THIS SECTION
38 +which would set up a Trillium Compact with serial 9999 named XX.SITE1 at 250hz sample rate.
74 74  
75 -[[image:original_0747763c-e3dd-4667-b897-833f12c8e0b8_20241219_130604.jpg||height="240" width="298"]]
76 76  
77 77  Here is a general guideline for how much data you can expect to fit on a card:
78 78  
79 79  {{{ 64Gb card: 245 days @ 250hz or 610 days @ 100hz
80 - 32Gb card: 122 days @ 250hz or 305 days @ 100hz
81 -}}}
44 + 32Gb card: 122 days @ 250hz or 305 days @ 100hz}}}
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 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
48 += LogFile Conversion Script =
91 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.
50 +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]].
93 93  
94 -= Logger Menus Overview (and setup) =
52 += Instrument Response =
95 95  
96 -The same menus are used in both the TSAWR and LPR-200 loggers.
54 +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).
97 97  
98 -== System Information ==
56 +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.
99 99  
100 -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.
58 +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).
101 101  
102 -This menu also displays the firmware version, battery, external, and solar voltages, and the temperature of the system.
60 +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') )
103 103  
104 -* Check all Initialisation Parameters are marked as successful.
105 -* Check that solar voltage is above 10 V, otherwise the station will not last long.
106 106  
107 -== Live Seismometer Data ==
63 += ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) =
108 108  
109 -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.
65 +Text here
110 110  
111 -* Check that all 3 channels are present and are producing a signal.
112 -* Stomp on the ground near where the sensor is installed to check that a signal is being picked up by all 3 channels.
113 -* Common representations of poor signals include channels sloping smoothly from high values to zero, or sharp corners in the plots.
67 +== Sub-paragraph ==
114 114  
115 -== GPS Data ==
69 +XXXX
116 116  
117 -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.
71 +== Sub-paragraph ==
118 118  
119 -* Check that the station is connected to satellites
73 +xx
120 120  
121 -== SD Information ==
75 +=== Sub-sub paragraph ===
122 122  
123 -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.
77 +x
124 124  
125 -== System Configuration ==
126 126  
127 -This menu is used to set the stations identifiers and parameters.
80 += ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
128 128  
129 -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).
82 +Text here
130 130  
131 -Next, the station identifier (up to 5 characters) and the network code (2 characters) can be set.
84 +== Sub-paragraph ==
132 132  
133 -Record start and stop mode should be left to 'On Request' mode.
86 +x
134 134  
135 -The seismometer model and serial number (up to 10 characters) can be set. Seismometer model options include:
88 +== Sub-paragraph ==
136 136  
137 -* Trillium Compact (same for 20 and 120)
138 -* CMG - 3ESP
139 -* Guralp 40T
140 -* LE-3D Lite
141 -* Mark L4C
142 -* Mark L4
90 +x
143 143  
144 -Additionally, the following settings can be used in place of the seismometer model types: +/- 20V, +/- 10V, +/- 5V
145 145  
146 -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.
93 += ANU "ANUSR" (Gen 1, 2003? - 2013?) =
147 147  
148 -* Set the sampling rate, station identifier, and network code. Set the appropriate seismometer type. Most importantly, ensure the record on restart setting is checked.
95 +x
149 149  
150 -(% class="box errormessage" %)
151 -(((
152 -NOTE: Ensure the 'RECORD ON RESTART' option is marked with a cross.
153 -)))
154 -
155 -(% class="wikigeneratedid" %)
156 -[[image:original_2b83fcf5-ee5a-4375-bab1-2d738e4ffe8c_20241219_130646.jpg||height="234" width="289"]]
157 -
158 -== STA/LTA Configuration ==
159 -
160 -The Short Term Average and Long Term Average Configuration screen.. this is a relic for when people weren't recording continuously. Not advised!
161 -
162 -= LogFile Conversion Script =
163 -
164 -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]].
165 -
166 -= Instrument Response =
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).
169 -
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 -
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 -
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') )
175 -
176 -
177 -= ANU TerraSAWR (Gen 3, FW 3.5a, 2017- current) =
178 -
179 -Not sure there's much left to say
180 -
181 -
182 -
183 -= ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
184 -
185 -Ditto the mighty LPR!
186 -
187 -
188 -= ANU "ANUSR" (Gen 1, 2003? - 2012) =
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.
191 -
192 -
193 193  = References =
194 194  
195 195  * [[PDF Manual>>http://auspass.edu.au/field/LPR-200_Instruction_Manual.pdf]]
... ... @@ -205,9 +205,6 @@
205 205  )))
206 206  
207 207  
208 -
209 -
210 -
211 211  (% class="box" %)
212 212  (((
213 213  = TerraSAWR Specs =
... ... @@ -220,13 +220,12 @@
220 220  [[image:1704864886951-793.jpg]]
221 221  
222 222  |=Size (L x W x H)|30 x 25 x12cm
223 -|=Weight (with battery)| 1.9kg (2.5kg)
124 +|=Weight (with battery)| ~*~*1.9kg (2.5kg)
224 224  |=Battery|(((
225 -Lead-acid 12v, ~~7-9Ah
126 +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  )))
... ... @@ -243,19 +243,16 @@
243 243  [[image:LPR 3.jpg]]
244 244  
245 245  |=Size (L x W x H)|42 x 34 x17 cm
246 -|=Weight (no battery)|5.5 kg
146 +|=Weight (with battery)|4.9 kg (7.3 kg)
247 247  |=Battery|(((
248 -NOW: Any 12v battery with tab connections that will fit (ex. the same TSAWR battery)
148 +LiFePo4 140Ah
249 249  
250 -DISCONTINUED: LiFePo4 140Ah Rechargeable (shown below).
150 +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  )))
261 261  )))
157 +
158 +
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