Wiki source code of ANU Seismic Data Loggers

Version 46.2 by robert on 2025/06/15 13:57

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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
	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
15.1	18	= Data Card Formatting and Information =
	19
42.1	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.
15.1	21
42.1	22	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	23
29.1	24	=== The format for ANUSRSetup.txt / LPR200s will be a single line of text that looks like this: ===
24.1	25
25.1	26	{{{XXX195G0100010034864 2 }}}
24.1	27
46.2	28	//corresponding to//
24.1	29
46.2	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
29.1	39	(% class="box warningmessage" %)
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31.3	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)
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24.1	43
31.4	44	=== The format for TSAWR loggers is shorter: ===
24.1	45
31.2	46	(% class="box errormessage" %)
	47	(((
	48	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!
	49	)))
24.1	50
31.2	51	SITE15G02500039999 2
	52
33.1	53	corresponding to site SITE1,
31.2	54
	55	network 5G
29.1	56	sample rate 0250, (i.e. 250 Hz)
	57	start mode (always 0),
	58	stop mode (always 0),
31.2	59	seismometer type (3 = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V),
29.1	60	and seismometer serial number (9999).
24.1	61
29.1	62
	63	=== The formatting process using the logger: ===
	64
30.1	65	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	67	[[image:original_0747763c-e3dd-4667-b897-833f12c8e0b8_20241219_130604.jpg\|\|height="240" width="298"]]
29.1	68
24.1	69	Here is a general guideline for how much data you can expect to fit on a card:
	70
	71	{{{ 64Gb card: 245 days @ 250hz or 610 days @ 100hz
31.1	72	32Gb card: 122 days @ 250hz or 305 days @ 100hz
	73	}}}
24.1	74
46.2	75	== Default Settings ==
24.1	76
46.2	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
31.1	86	= Logger Menus Overview (and setup) =
24.1	87
36.1	88	The same menus are used in both the TSAWR and LPR-200 loggers.
31.4	89
31.1	90	== System Information ==
	91
	92	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.
	93
	94	This menu also displays the firmware version, battery, external, and solar voltages, and the temperature of the system.
	95
44.1	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.
31.1	98
	99	== Live Seismometer Data ==
	100
	101	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.
	102
44.1	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.
31.1	106
33.1	107	== GPS Data ==
31.3	108
	109	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.
	110
43.1	111	* Check that the station is connected to satellites
31.3	112
	113	== SD Information ==
	114
	115	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.
	116
31.2	117	== System Configuration ==
	118
	119	This menu is used to set the stations identifiers and parameters.
	120
	121	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).
	122
	123	Next, the station identifier (up to 5 characters) and the network code (2 characters) can be set.
	124
	125	Record start and stop mode should be left to 'On Request' mode.
	126
	127	The seismometer model and serial number (up to 10 characters) can be set. Seismometer model options include:
	128
43.1	129	* Trillium Compact (same for 20 and 120)
	130	* CMG - 3ESP
	131	* Guralp 40T
	132	* LE-3D Lite
	133	* Mark L4C
	134	* Mark L4
31.2	135
	136	Additionally, the following settings can be used in place of the seismometer model types: +/- 20V, +/- 10V, +/- 5V
	137
31.3	138	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	139
43.1	140	* 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	142	(% class="box errormessage" %)
31.2	143	(((
	144	NOTE: Ensure the 'RECORD ON RESTART' option is marked with a cross.
	145	)))
	146
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42.1	148	[[image:original_2b83fcf5-ee5a-4375-bab1-2d738e4ffe8c_20241219_130646.jpg\|\|height="234" width="289"]]
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31.3	150	== STA/LTA Configuration ==
	151
43.1	152	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	153
27.2	154	= LogFile Conversion Script =
	155
42.1	156	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	157
28.1	158	= Instrument Response =
27.2	159
46.2	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).
1.1	161
28.1	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
	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
46.2	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') )
28.1	167
	168
46.2	169	= ANU TerraSAWR (Gen 3, FW 3.5a, 2017- current) =
28.1	170
43.1	171	Words to describe the TSAWR would go here, if needed
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	173
	174
28.1	175	= ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
1.1	176
43.1	177	Ditto the mighty LPR!
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	179
46.2	180	= ANU "ANUSR" (Gen 1, 2003? - 2012) =
1.1	181
46.2	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.
1.1	183
	184
	185	= References =
	186
42.1	187	* [[PDF Manual>>http://auspass.edu.au/field/LPR-200_Instruction_Manual.pdf]]
	188	)))
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	190	(% class="col-xs-12 col-sm-4" %)
	191	(((
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	193	(((
6.1	194	Contents
1.1	195
42.1	196	{{toc/}}
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	198
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45.1	200
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46.2	202
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	204	(((
7.1	205	= TerraSAWR Specs =
6.1	206
1.1	207
42.1	208	[[image:Terrasawr 1.jpg]]
9.1	209
42.1	210	[[image:1704865206800-824.jpg]]
9.1	211
42.1	212	[[image:1704864886951-793.jpg]]
9.1	213
11.1	214	\|=Size (L x W x H)\|30 x 25 x12cm
45.1	215	\|=Weight (with battery)\| 1.9kg (2.5kg)
14.1	216	\|=Battery\|(((
46.2	217	Lead-acid 12v, ~~7-9Ah
2.2	218
	219	Rechargeable
1.1	220	)))
46.2	221	\|=Current Firmware\|3.5a (Jan 2025)
16.1	222
42.1	223	[[image:terrasawr battery.jpg]]
2.2	224	)))
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	228	(((
7.1	229	= LPR-200 Specs =
3.1	230
42.1	231	[[image:LPR 1.jpg]]
3.1	232
42.1	233	[[image:LPR 2.jpg]]
9.1	234
42.1	235	[[image:LPR 3.jpg]]
9.1	236
11.1	237	\|=Size (L x W x H)\|42 x 34 x17 cm
45.1	238	\|=Weight (no battery)\|5.5 kg
14.1	239	\|=Battery\|(((
46.1	240	NOW: Any 12v battery with tab connections that will fit (ex. the same TSAWR battery)
3.1	241
46.2	242	DISCONTINUED: LiFePo4 140Ah Rechargeable (shown below).
3.1	243	)))
46.2	244	\|=Current Firmware\|(((
	245	2.6a (old GPS modules) / 2.7a
16.1	246
46.2	247	Jan 2025
	248	)))
	249
42.1	250	[[image:LPR battery.jpg]]
3.1	251	)))
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