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Changes for page ANU Seismic Data Loggers

Last modified by robert on 2025/04/24 14:58
From version 27.2
edited by robert
on 2024/03/18 15:42
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

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... ... @@ -49,9 +49,19 @@
49 49  
50 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]].
51 51  
52 += Instrument Response =
52 52  
53 -= ANU TerraSAWR (Gen 3, 2017?- current) =
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).
54 54  
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.
57 +
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).
59 +
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') )
61 +
62 +
63 += ANU TerraSAWR (Gen 3, FW 3.5a, 2017?- current) =
64 +
55 55  Text here
56 56  
57 57  == Sub-paragraph ==
... ... @@ -67,7 +67,7 @@
67 67  x
68 68  
69 69  
70 -= ANU LPR-200 (Gen 2, 2013 - current) =
80 += ANU LPR-200 (Gen 2, FW 2.6a/2.7a, 2013 - current) =
71 71  
72 72  Text here
73 73