Wiki source code of ANU Seismic Data Loggers

Version 50.1 by robert on 2025/06/30 18:12

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38.1	9	ANU has designed and built three generations of seismic data recorders, two of which (the small yellow TerraSAWR and the larger beige LPR-200) are still in use today. Despite their contrasting appearance, they both use the same software, data cards, and have the same instrument response.
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1.1	12
46.2	13	= Power Considerations =
	14
47.1	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.
46.2	16
49.1	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, < 5mW). 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.
46.2	18
47.1	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.
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	21	(% class="box infomessage" %)
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	23	Power issues are easy and cheap to solve relative to the cost of your experiment, don't skimp!
	24	)))
	25
15.1	26	= Data Card Formatting and Information =
	27
42.1	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.
15.1	29
42.1	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.
24.1	31
48.1	32	== The format for ANUSRSetup.txt / LPR200s will be a single line of text that looks like this: ==
24.1	33
25.1	34	{{{XXX195G0100010034864 2 }}}
24.1	35
46.2	36	//corresponding to//
24.1	37
46.2	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
29.1	47	(% class="box warningmessage" %)
	48	(((
31.3	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)
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24.1	51
48.1	52	== The format for TSAWR loggers is shorter: ==
24.1	53
31.2	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	)))
24.1	58
31.2	59	SITE15G02500039999 2
	60
33.1	61	corresponding to site SITE1,
31.2	62
	63	network 5G
29.1	64	sample rate 0250, (i.e. 250 Hz)
	65	start mode (always 0),
	66	stop mode (always 0),
31.2	67	seismometer type (3 = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V),
29.1	68	and seismometer serial number (9999).
24.1	69
29.1	70
48.1	71	== The formatting process using the logger: ==
29.1	72
30.1	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
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42.1	75	[[image:original_0747763c-e3dd-4667-b897-833f12c8e0b8_20241219_130604.jpg\|\|height="240" width="298"]]
29.1	76
24.1	77	Here is a general guideline for how much data you can expect to fit on a card:
	78
	79	{{{ 64Gb card: 245 days @ 250hz or 610 days @ 100hz
31.1	80	32Gb card: 122 days @ 250hz or 305 days @ 100hz
	81	}}}
24.1	82
46.2	83	== Default Settings ==
24.1	84
46.2	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
	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
	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.
	93
31.1	94	= Logger Menus Overview (and setup) =
24.1	95
36.1	96	The same menus are used in both the TSAWR and LPR-200 loggers.
31.4	97
31.1	98	== System Information ==
	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.
	101
	102	This menu also displays the firmware version, battery, external, and solar voltages, and the temperature of the system.
	103
44.1	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.
31.1	106
	107	== Live Seismometer Data ==
	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.
	110
44.1	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.
31.1	114
33.1	115	== GPS Data ==
31.3	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.
	118
43.1	119	* Check that the station is connected to satellites
31.3	120
	121	== SD Information ==
	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.
	124
31.2	125	== System Configuration ==
	126
	127	This menu is used to set the stations identifiers and parameters.
	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).
	130
	131	Next, the station identifier (up to 5 characters) and the network code (2 characters) can be set.
	132
	133	Record start and stop mode should be left to 'On Request' mode.
	134
	135	The seismometer model and serial number (up to 10 characters) can be set. Seismometer model options include:
	136
43.1	137	* Trillium Compact (same for 20 and 120)
	138	* CMG - 3ESP
	139	* Guralp 40T
	140	* LE-3D Lite
	141	* Mark L4C
	142	* Mark L4
31.2	143
	144	Additionally, the following settings can be used in place of the seismometer model types: +/- 20V, +/- 10V, +/- 5V
	145
31.3	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.
31.2	147
43.1	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.
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31.3	150	(% class="box errormessage" %)
31.2	151	(((
	152	NOTE: Ensure the 'RECORD ON RESTART' option is marked with a cross.
	153	)))
	154
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42.1	156	[[image:original_2b83fcf5-ee5a-4375-bab1-2d738e4ffe8c_20241219_130646.jpg\|\|height="234" width="289"]]
34.1	157
31.3	158	== STA/LTA Configuration ==
	159
43.1	160	The Short Term Average and Long Term Average Configuration screen.. this is a relic for when people weren't recording continuously. Not advised!
31.3	161
27.2	162	= LogFile Conversion Script =
	163
42.1	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]].
27.2	165
28.1	166	= Instrument Response =
27.2	167
50.1	168	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.
1.1	169
49.1	170	{{info}}
50.1	171	The Stage 3 SINC coefficients (600+) during the initial 1024k > 16k decimation were left off as they slowed down the process x10 and contribute very little (< 0.3 db, < 0.31 ms) to the end result
49.1	172	{{/info}}
28.1	173
49.1	174	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.
28.1	175
48.1	176	Instrument response can be downloaded from IRIS [[Nominal Response Library>>https://ds.iris.edu/ds/nrl/]] 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') ).
28.1	177
	178
46.2	179	= ANU TerraSAWR (Gen 3, FW 3.5a, 2017- current) =
28.1	180
47.1	181	Not sure there's much left to say
1.1	182
	183
	184
28.1	185	= ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
1.1	186
43.1	187	Ditto the mighty LPR!
1.1	188
	189
46.2	190	= ANU "ANUSR" (Gen 1, 2003? - 2012) =
1.1	191
46.2	192	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.
1.1	193
	194
	195	= References =
	196
42.1	197	* [[PDF Manual>>http://auspass.edu.au/field/LPR-200_Instruction_Manual.pdf]]
	198	)))
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6.1	204	Contents
1.1	205
42.1	206	{{toc/}}
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46.2	212
48.1	213
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	217	(((
7.1	218	= TerraSAWR Specs =
6.1	219
1.1	220
42.1	221	[[image:Terrasawr 1.jpg]]
9.1	222
42.1	223	[[image:1704865206800-824.jpg]]
9.1	224
42.1	225	[[image:1704864886951-793.jpg]]
9.1	226
11.1	227	\|=Size (L x W x H)\|30 x 25 x12cm
45.1	228	\|=Weight (with battery)\| 1.9kg (2.5kg)
14.1	229	\|=Battery\|(((
46.2	230	Lead-acid 12v, ~~7-9Ah
2.2	231
	232	Rechargeable
1.1	233	)))
46.2	234	\|=Current Firmware\|3.5a (Jan 2025)
16.1	235
42.1	236	[[image:terrasawr battery.jpg]]
2.2	237	)))
1.1	238
17.1	239
1.1	240	(% class="box" %)
	241	(((
7.1	242	= LPR-200 Specs =
3.1	243
42.1	244	[[image:LPR 1.jpg]]
3.1	245
42.1	246	[[image:LPR 2.jpg]]
9.1	247
42.1	248	[[image:LPR 3.jpg]]
9.1	249
11.1	250	\|=Size (L x W x H)\|42 x 34 x17 cm
45.1	251	\|=Weight (no battery)\|5.5 kg
14.1	252	\|=Battery\|(((
46.1	253	NOW: Any 12v battery with tab connections that will fit (ex. the same TSAWR battery)
3.1	254
46.2	255	DISCONTINUED: LiFePo4 140Ah Rechargeable (shown below).
3.1	256	)))
46.2	257	\|=Current Firmware\|(((
	258	2.6a (old GPS modules) / 2.7a
16.1	259
46.2	260	Jan 2025
	261	)))
	262
42.1	263	[[image:LPR battery.jpg]]
3.1	264	)))
1.1	265	)))
42.1	266	)))

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