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Changes for page ANU Seismic Data Loggers

Last modified by robert on 2025/06/27 16:42
From version 31.1
edited by Jack Dent
on 2024/12/19 11:06
Change comment: There is no comment for this version
To version 43.1
edited by robert
on 2025/03/03 18:26
Change comment: There is no comment for this version

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Author
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1 -XWiki.JackD
1 +XWiki.robert
Content
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26 26   "gps interval" 01 (once per hour~-~- don't change),
27 27   start mode (always 0),
28 28   stop mode (always 0),
29 - seismometer type (3 = broadband (+/- 20V), 1 = shortperiod (+/- 5V),
29 + seismometer type (3 = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V),
30 30   and seismometer serial number (4864).
31 31  
32 32  (% class="box warningmessage" %)
33 33  (((
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)
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)
35 35  )))
36 36  
37 -=== The format for TSAWR loggers are a bit shorter as they don't have an option to set the "gps sync" ===
37 +=== The format for TSAWR loggers is shorter: ===
38 38  
39 -SITE1XX02500039999 2
39 +(% class="box errormessage" %)
40 +(((
41 +**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!**
42 +)))
40 40  
41 -corresponding to site XX.SITE1,
44 +SITE15G02500039999 2
45 +
46 +corresponding to site SITE1, 
47 +
48 + network 5G
42 42   sample rate 0250, (i.e. 250 Hz)
43 43   start mode (always 0),
44 44   stop mode (always 0),
45 - seismometer type (3 = broadband (+/- 20V), 1 = shortperiod (+/- 5V),
52 + seismometer type (3 = broadband (+/- 20V), 2 = Guralp (+/- 10V), 1 = shortperiod (+/- 5V),
46 46   and seismometer serial number (9999).
47 47  
48 48  
... ... @@ -50,6 +50,7 @@
50 50  
51 51  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
52 52  
60 +[[image:original_0747763c-e3dd-4667-b897-833f12c8e0b8_20241219_130604.jpg||height="240" width="298"]]
53 53  
54 54  Here is a general guideline for how much data you can expect to fit on a card:
55 55  
... ... @@ -60,6 +60,8 @@
60 60  
61 61  = Logger Menus Overview (and setup) =
62 62  
71 +The same menus are used in both the TSAWR and LPR-200 loggers.
72 +
63 63  == System Information ==
64 64  
65 65  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.
... ... @@ -68,67 +68,105 @@
68 68  
69 69  ==== Upon setup ====
70 70  
71 -- Check all Initialisation Parameters are marked as successful
81 +- Check all Initialisation Parameters are marked as successful.
72 72  
73 -{{info}}
74 -
75 -{{/info}}
83 +- Check that solar voltage is above 10 V, otherwise the station will not last long.
76 76  
85 +
77 77  == Live Seismometer Data ==
78 78  
79 79  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.
80 80  
90 +==== Upon setup ====
81 81  
92 +- Check that all 3 channels are present and are producing a signal.
82 82  
83 -= LogFile Conversion Script =
94 +- Stomp on the ground near where the sensor is installed to check that a signal is being picked up by all 3 channels.
84 84  
85 -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]].
96 +- Common representations of poor signals include channels sloping smoothly from high values to zero, or sharp corners in the plots.
86 86  
87 -= Instrument Response =
88 88  
89 -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).
99 +== GPS Data ==
90 90  
91 -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.
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.
92 92  
93 -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).
103 +* Check that the station is connected to satellites
94 94  
95 -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') )
96 96  
106 +== SD Information ==
97 97  
98 -= ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) =
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.
99 99  
100 -Text here
101 101  
102 -== Sub-paragraph ==
111 +== System Configuration ==
103 103  
104 -XXXX
113 +This menu is used to set the stations identifiers and parameters.
105 105  
106 -== Sub-paragraph ==
115 +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).
107 107  
108 -xx
117 +Next, the station identifier (up to 5 characters) and the network code (2 characters) can be set.
109 109  
110 -=== Sub-sub paragraph ===
119 +Record start and stop mode should be left to 'On Request' mode.
111 111  
112 -x
121 +The seismometer model and serial number (up to 10 characters) can be set. Seismometer model options include:
113 113  
123 +* Trillium Compact (same for 20 and 120)
124 +* CMG - 3ESP
125 +* Guralp 40T
126 +* LE-3D Lite
127 +* Mark L4C
128 +* Mark L4
114 114  
115 -= ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
130 +Additionally, the following settings can be used in place of the seismometer model types: +/- 20V, +/- 10V, +/- 5V
116 116  
117 -Text here
132 +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.
118 118  
119 -== Sub-paragraph ==
134 +* Set the sampling rate, station identifier, and network code. Set the appropriate seismometer type. Most importantly, ensure the record on restart setting is checked.
120 120  
121 -x
136 +(% class="box errormessage" %)
137 +(((
138 +NOTE: Ensure the 'RECORD ON RESTART' option is marked with a cross.
139 +)))
122 122  
123 -== Sub-paragraph ==
141 +(% class="wikigeneratedid" %)
142 +[[image:original_2b83fcf5-ee5a-4375-bab1-2d738e4ffe8c_20241219_130646.jpg||height="234" width="289"]]
124 124  
125 -x
144 +== STA/LTA Configuration ==
126 126  
146 +The Short Term Average and Long Term Average Configuration screen.. this is a relic for when people weren't recording continuously. Not advised!
127 127  
148 += LogFile Conversion Script =
149 +
150 +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]].
151 +
152 += Instrument Response =
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).
155 +
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 +
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 +
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') )
161 +
162 +
163 += ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) =
164 +
165 +Words to describe the TSAWR would go here, if needed
166 +
167 + 
168 +
169 +
170 += ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
171 +
172 +Ditto the mighty LPR!
173 +
174 +
128 128  = ANU "ANUSR" (Gen 1, 2003? - 2013?) =
129 129  
130 -x
177 +This logger has been retired for a long time and has a different instrument response.
131 131  
179 +
132 132  = References =
133 133  
134 134  * [[PDF Manual>>http://auspass.edu.au/field/LPR-200_Instruction_Manual.pdf]]
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189 189  )))
190 190  )))
191 191  )))
192 -
193 -
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