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Changes for page ANU Seismic Data Loggers

Last modified by Jack Dent on 2026/06/03 09:42
From version 74.1
edited by Jack Dent
on 2026/06/03 09:41
Change comment: There is no comment for this version
To version 31.2
edited by Jack Dent
on 2024/12/19 12:12
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -10,36 +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.
16 -
17 -At 100 Hz and with a GPS cable connected these loggers draw about 220 mW of power once the screen is off (higher sample rates draw more power but only marginally, < 5 mW). 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 20 Volt, 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** when possible a 20 Watt panel works best, especially as they usually cost only $10-20 more these days.
20 -
21 -Measurements of a 20 Watt panel in the Canberra (Aus) area show that in full sun, roughly 0.75 amps are put out. As the LPR-200 and TSAWR loggers step down the solar voltage to 12v, a 20 Watt solar panel realistically provides 9 Watts to a seismic station. Theoretically, 1 hour and 9 minutes of sun per day should keep the battery charge stable. However, in practice, 1 hour and 30 minutes of full sunlight for a 20 Watt solar panel is required to keep these stations at a stable charge (this was tested over a 5 day period under Canberra sun in spring)
22 -
23 -**Note**: It is important to understand 2 main limitations of the solar component of these seismic stations. First, the voltage output of most solar panels will drop significantly if even a small portion of the panel is shaded. This is why 'full' sun is a requirement. Second, 1 hour and 30 minutes of full sun per day will not always be achieved. The sunniest possible location for a seismic station is always ideal.
24 -
25 -40 Watt panels can also be used, and may be needed for extreme climates, or areas without a full sky view. 60 Watt panels have also been known to work, but this is now reaching the the limit of what the loggers can reasonably handle for extended periods and are not recommended for long term deploys.
26 -
27 -(% class="box infomessage" %)
28 -(((
29 -Power issues are easy and cheap to solve relative to the cost of your experiment, don't skimp!
30 -)))
31 -
32 -(% class="wikigeneratedid" %)
33 -In the case of an LPR, there is a large compartment for housing an internal battery, able to accommodate anything from a 10-30Ah battery. To use a standard lead acid battery with a positive and negative terminal, a 6 pin adaptor must be used. This ensures the voltage from the external power port (pins A and C) connect to the battery and ensure the system actually recharges. (See [[Peripheral Equipment>>doc:Instrumentation.Peripheral Equipment.WebHome]] for a more comprehensive overview of this kind of setup)
34 -
35 -= GPS Considerations =
36 -
37 -GPS is required for the data to have accurate timestamps. A standard 3-5V 1575.42 Mhz coaxial "dongle" antenna works fine and can be found for relatively cheap (e.g. [[https:~~/~~/www.elecbee.com/en-3555-gps-antenna-bnc-male-for-garmin-gps-120120xl125-sounder-with-cable-2m) >>https://www.elecbee.com/en-3555-gps-antenna-bnc-male-for-garmin-gps-120120xl125-sounder-with-cable-2m]]. Anything that locates satellites and gives you a GPS-synced time works!
38 -
39 -The TerraSAWR has a built-in GPS but this doesn't work as well, especially if the logger is (wisely) buried. **The LPR does NOT have a built-in GPS antenna, so an external antenna is mandatory.**
40 -
41 -In a pinch, a severed or broken antenna can be mended back together relatively easily by non-experts. Even stripping the wire and twisting it back together by hand on site is possible!
42 -
43 43  = Data Card Formatting and Information =
44 44  
45 45  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.
... ... @@ -46,29 +46,25 @@
46 46  
47 47  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.
48 48  
49 -(% class="wikigeneratedid" id="HTheformatforANUSRSetup.txt2FLPR200swillbeasinglelineoftextthatlookslikethis:" %)
50 -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: ===
51 51  
52 52  {{{XXX195G0100010034864 2 }}}
53 53  
54 -//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).
55 55  
56 - site **XXX19**,
57 - network **5G**,
58 - sample rate **0100**, (i.e. 100 Hz)
59 - "gps interval" **01** (once per hour~-~- don't change),
60 - start mode (always **0**),
61 - stop mode (always **0**),
62 - seismometer type (**3** = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V),
63 - and seismometer serial number (**4864**).
64 -
65 65  (% class="box warningmessage" %)
66 66  (((
67 -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)
34 +NOTE: the 2 at the very end is for "start recording on power" 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)
68 68  )))
69 69  
70 -(% class="wikigeneratedid" id="HTheformatforTSAWRloggersisshorter:" %)
71 -The format for TSAWR loggers is shorter:
37 +=== The format for TSAWR loggers is shorter ===
72 72  
73 73  (% class="box errormessage" %)
74 74  (((
... ... @@ -77,7 +77,7 @@
77 77  
78 78  SITE15G02500039999 2
79 79  
80 -corresponding to site SITE1, 
46 +corresponding to site SITE1,
81 81  
82 82   network 5G
83 83   sample rate 0250, (i.e. 250 Hz)
... ... @@ -87,12 +87,10 @@
87 87   and seismometer serial number (9999).
88 88  
89 89  
90 -(% class="wikigeneratedid" id="HTheformattingprocessusingthelogger:" %)
91 -The formatting process using the logger:
56 +=== The formatting process using the logger: ===
92 92  
93 93  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
94 94  
95 -[[image:original_0747763c-e3dd-4667-b897-833f12c8e0b8_20241219_130604.jpg||height="240" width="298"]]
96 96  
97 97  Here is a general guideline for how much data you can expect to fit on a card:
98 98  
... ... @@ -100,21 +100,9 @@
100 100   32Gb card: 122 days @ 250hz or 305 days @ 100hz
101 101  }}}
102 102  
103 -== Default Settings ==
104 104  
105 -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.
106 -
107 -* XX.ANUSR network and station name
108 -* 100 Hz Sample Rate
109 -* 40 Vpp (or +/- 20 V) gain / Trillium Compact seismometer version
110 -* Record on Restart enabled
111 -
112 -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.
113 -
114 114  = Logger Menus Overview (and setup) =
115 115  
116 -The same menus are used in both the TSAWR and LPR-200 loggers.
117 -
118 118  == System Information ==
119 119  
120 120  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.
... ... @@ -121,27 +121,26 @@
121 121  
122 122  This menu also displays the firmware version, battery, external, and solar voltages, and the temperature of the system.
123 123  
124 -* Check that all //Initialisation Parameters// are marked as successful.
125 -* Check that solar voltage is above 10 V in the software, or preferrably physically check that the battery's voltage is increasing via a DMM.
76 +==== Upon setup ====
126 126  
78 +- Check all Initialisation Parameters are marked as successful.
79 +
80 +- Check that solar voltage is above 10 V, otherwise the station will not last long.
81 +
82 +
127 127  == Live Seismometer Data ==
128 128  
129 129  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.
130 130  
131 -* Check that all 3 channels are present and are producing a signal.
132 -* Stomp on the ground near where the sensor is installed to check that a signal is being picked up by all 3 channels.
133 -* Common representations of poor signals include channels sloping smoothly from high values to zero, or sharp corners in the plots.
87 +==== Upon setup ====
134 134  
135 -== GPS Data ==
89 +- Check that all channels are present and are producing a signal.
136 136  
137 -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.
91 +- Stomp on the ground near where the sensor is installed to check that a signal is being picked up.
138 138  
139 -* Check that the station is connected to satellites. 3 or more should be perfectly adequate to keep time.
93 +- Common representations of poor signals include channels sloping smoothly from high values to zero, or sharp corners in the plots.
140 140  
141 -== SD Information ==
142 142  
143 -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.
144 -
145 145  == System Configuration ==
146 146  
147 147  This menu is used to set the stations identifiers and parameters.
... ... @@ -154,112 +154,83 @@
154 154  
155 155  The seismometer model and serial number (up to 10 characters) can be set. Seismometer model options include:
156 156  
157 -* Trillium Compact (same for 20s and 120s models)
158 -* CMG - 3ESP
159 -* Guralp 40T
160 -* LE-3D Lite
161 -* Mark L4C
162 -* Mark L4
108 +- Trillium Compact
163 163  
164 -Additionally, the following settings can be used in place of the seismometer model types: +/- 20V, +/- 10V, +/- 5V
110 +- CMG - 3ESP
165 165  
166 -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.
112 +- Guralp 40T
167 167  
168 -* Set the sampling rate, station identifier, and network code. Set the appropriate seismometer type. Most importantly, ensure the record on restart setting is checked.
114 +- LE-3D Lite
169 169  
170 -(% class="box errormessage" %)
171 -(((
172 -Again, ensure the 'RECORD ON RESTART' option is marked with a cross (the default setting). This ensures that the logger will record any time it receives enough power!
173 -)))
116 +- Mark L4C
174 174  
175 -(% class="wikigeneratedid" %)
176 -[[image:original_2b83fcf5-ee5a-4375-bab1-2d738e4ffe8c_20241219_130646.jpg||height="234" width="289"]]
118 +- Mark L4
177 177  
178 -== STA/LTA Configuration ==
120 +Additionally, the following settings can be used in place of the seismometer model types: +/- 20V, +/- 10V, +/- 5V
179 179  
180 -The Short Term Average and Long Term Average Configuration screen.. this is a relic for when people weren't recording continuously. Not advised!
122 +The record on restart option ensures that if the logger dies and is powered back up in the field (due to battery charging cycles or other causes) that the recording will resume.
181 181  
182 -= LogFile Conversion Script =
124 +==== Upon setup ====
183 183  
184 -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]] (current version: 1.42, 02/2026).
126 +- Set the sampling rate, station identifier, and network code. Set the appropriate seismometer type. Most importantly, ensure the record on restart setting is checked.
185 185  
186 -= Instrument Response =
128 +(% class="box warningmessage" %)
129 +(((
130 +NOTE: Ensure the 'RECORD ON RESTART' option is marked with a cross.
131 +)))
187 187  
188 -Both the TerraSAWR and LPR-200 use the same ADS1281 analog-to-digital converter chip and are designed to have identical instrument response. The ADC (analog to digital) chip in both loggers originally samples at 1024000 Hz and downsamples towards the output data rate via a 5th order SINC filter, then another four FIR filters. If the output is below 250 Hz, a final "pure" /5 decimation is done without any sort of FIR filter (for better or worse!).
133 += LogFile Conversion Script =
189 189  
190 -In the logger's menu, 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. This gain manifests itself in stage 2 in the response information.
135 +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]].
191 191  
192 -//(The 600+ Stage 3 SINC coefficients during the initial 1024k > 16k decimation were left off as they slowed down the process x10 and contribute at most 0.3 db amplitude and 0.31 ms phase delay discrepancies, and primarily only to frequencies near the nyquist. If for some reason you want to add this phase manually we can share the parameters with you.)//
137 += Instrument Response =
193 193  
194 -You might notice that the response information may come in two versions. The response from our website (see link below) includes the 2nd "sensor gain" stage for clarity. e.g. here is a Trillium Compact 120 & ANU Logger response
139 +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).
195 195  
196 -##Channel Response
197 - From M/S (Velocity) to COUNTS ()
198 - Overall Sensitivity: 3.95452e+08 defined at 1.000 Hz
199 - 8 stages:
200 - Stage 1: PolesZerosResponseStage from M/S to V, gain: 754.3
201 - Stage 2: ResponseStage from V to V, gain: 0.25
202 - Stage 3: CoefficientsTypeResponseStage from V to COUNTS, gain: 2.09715e+06
203 - Stage 4: FIRResponseStage from COUNTS to COUNTS, gain: 1
204 - Stage 5: FIRResponseStage from COUNTS to COUNTS, gain: 1
205 - Stage 6: FIRResponseStage from COUNTS to COUNTS, gain: 0.99998
206 - Stage 7: FIRResponseStage from COUNTS to COUNTS, gain: 1##
141 +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.
207 207  
143 +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).
208 208  
209 -However, if retrieving from AusPass or IRIS, the 2nd "sensor gain" stage is combined with the logger gain. This has no affect, but you may detect that the former Stage 2 V->V ResponseStage has been merged into the Stage 3 gain.
145 +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') )
210 210  
211 -##Channel Response
212 - From M/S (Velocity) to COUNTS ()
213 - Overall Sensitivity: 3.9546e+08 defined at 1.000 Hz
214 - 6 stages:
215 - Stage 1: PolesZerosResponseStage from M/S to V, gain: 754.3
216 - Stage 2: CoefficientsTypeResponseStage from V to COUNTS, gain: 524288
217 - Stage 3: FIRResponseStage from COUNTS to COUNTS, gain: 1
218 - Stage 4: FIRResponseStage from COUNTS to COUNTS, gain: 1
219 - Stage 5: FIRResponseStage from COUNTS to COUNTS, gain: 0.99998
220 - Stage 6: FIRResponseStage from COUNTS to COUNTS, gain: 1##
221 221  
148 += ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) =
222 222  
223 -For the most part, the data logger response essentially flat when the samplerate output is set to 100 Hz or less and for seismological purposes is likely to be impossible to detect below 20 Hz regardless.
150 +Text here
224 224  
225 -Instrument response can be downloaded from IRIS [[Nominal Response Library>>https://ds.iris.edu/ds/nrl/datalogger/anurses]] if need be, or [[directly from us>>http://auspass.edu.au/data/logger_response]] , or by downloading the response of an equivalent sensor at AusPass (e.g. get_stations(level='response') ).
152 +== Sub-paragraph ==
226 226  
154 +XXXX
227 227  
228 -[[Amplitude and phase response for ANU logger at 50 Hz>>image:ANU_50hz_response.png||data-xwiki-image-style-alignment="center" height="356" width="475"]]
156 +== Sub-paragraph ==
229 229  
230 -[[Amplitude and phase response for ANU logger at 100 Hz>>image:ANU_100hz_response.png||data-xwiki-image-style-alignment="center" height="355" width="473"]]
158 +xx
231 231  
232 -[[Amplitude and phase response for ANU logger at 250 Hz>>image:ANU_250hz_response.png||data-xwiki-image-style-alignment="center" height="359" width="479"]]
160 +=== Sub-sub paragraph ===
233 233  
234 -[[Amplitude and phase response for ANU logger at 1000 Hz>>image:ANU_1000hz_response.png||data-xwiki-image-style-alignment="center" height="367" width="489"]]
162 +x
235 235  
236 236  
237 -[[Huddle test comparing a Trillium Compact 120 + TerraSAWR vs a Trillium Compact 120 + Nanometrics Centaur (M8.AUANU) at 100 Hz>>image:TC120_ANU_vs_CENTAUR.png||data-xwiki-image-style-alignment="center"]]
165 += ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
238 238  
239 -= ANU TerraSAWR (Gen 3, FW 3.5a, 2014- current) =
167 +Text here
240 240  
241 -Earliest known model is dated July 2014 (though first deployed in 2019) and our current flagship model. Lightweight and small.
169 +== Sub-paragraph ==
242 242  
243 -= ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2011 - current) =
171 +x
244 244  
245 -Earliest known model is dated May 2011 (but first deployed November 2012) and still in use today. Potentially capable of housing much larger batteries than the TSAWR due to the larger cavity space.
173 +== Sub-paragraph ==
246 246  
247 -We have found that the older LPR SD card slots can sometimes fail such that the data cards prematurely "pop out" during recording, which can be catastrophic. This seems to mostly occur in periods of hot weather, but not always. We have developed a small add-on that screws into the nearby serial port that effectively holds the cards in place and will ship included with these loggers. Screw the device in firmly, then **gently** slide over a pre-inserted card until it is flush with the top of the card. It probably won't slide over all the way and that's by design. Take care not to force the depress the card inadvertently (although testing has shown it will still record).
175 +x
248 248  
249 - [[image:LPR_card_adaptors.jpg||alt="image of the LPR SD-card adapter"]]
250 250  
251 -= ANU "ANUSR" (Gen 1, 2003? - 2012) =
178 += ANU "ANUSR" (Gen 1, 2003? - 2013?) =
252 252  
253 -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.
180 +x
254 254  
255 -
256 256  = References =
257 257  
258 258  * [[PDF Manual>>http://auspass.edu.au/field/LPR-200_Instruction_Manual.pdf]]
259 -
260 -[[TSAWR & LPR-200 sensor pinout>>image:ANU_seismometer_connection.png]]
261 -
262 -
263 263  )))
264 264  
265 265  (% class="col-xs-12 col-sm-4" %)
... ... @@ -272,37 +272,6 @@
272 272  )))
273 273  
274 274  
275 -
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299 -
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302 -
303 -
304 -
305 -
306 306  (% class="box" %)
307 307  (((
308 308  = TerraSAWR Specs =
... ... @@ -315,13 +315,12 @@
315 315  [[image:1704864886951-793.jpg]]
316 316  
317 317  |=Size (L x W x H)|30 x 25 x12cm
318 -|=Weight (with battery)| 1.9kg (2.5kg)
209 +|=Weight (with battery)| ~*~*1.9kg (2.5kg)
319 319  |=Battery|(((
320 -Lead-acid 12v, ~~7-9Ah
211 +Lead-acid 12v, ~~7Ah
321 321  
322 322  Rechargeable
323 323  )))
324 -|=Current Firmware|3.5a (Jan 2025)
325 325  
326 326  [[image:terrasawr battery.jpg]]
327 327  )))
... ... @@ -338,37 +338,16 @@
338 338  [[image:LPR 3.jpg]]
339 339  
340 340  |=Size (L x W x H)|42 x 34 x17 cm
341 -|=Weight (no battery)|5.5 kg
231 +|=Weight (with battery)|4.9 kg (7.3 kg)
342 342  |=Battery|(((
343 -NOW: Any 12v battery with tab connections that will fit (ex. the same TSAWR battery)
233 +LiFePo4 140Ah
344 344  
345 -DISCONTINUED: LiFePo4 140Ah Rechargeable (shown below).
235 +Rechargeable
346 346  )))
347 -|=Current Firmware|(((
348 -2.6a (old GPS modules) / 2.7a
349 349  
350 -Jan 2025
351 -)))
352 -
353 353  [[image:LPR battery.jpg]]
354 354  )))
355 355  )))
241 +)))
356 356  
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373 373  
374 -)))
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