Changes for page ANU Seismic Data Loggers

Last modified by robert on 2025/08/08 16:09

From 59.1 to 58.2

From version 64.1

edited by robert
on 2025/08/08 16:09

Change comment: There is no comment for this version

To version 59.1

edited by robert
on 2025/08/06 18:36

Change comment: There is no comment for this version

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@@ -104,8 +104,8 @@
  This menu also displays the firmware version, battery, external, and solar voltages, and the temperature of the system.
--* Check that all //Initialisation Parameters// are marked as successful.
--* 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.
++* Check all Initialisation Parameters are marked as successful.
++* Check that solar voltage is above 10 V, otherwise the station will not last long.
  == Live Seismometer Data ==
@@ -119,7 +119,7 @@
  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.
--* Check that the station is connected to satellites. 3 or more should be perfectly adequate to keep time.
++* Check that the station is connected to satellites
  == SD Information ==
@@ -152,7 +152,7 @@
  (% class="box errormessage" %)
  (((
--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!
++NOTE: Ensure the 'RECORD ON RESTART' option is marked with a cross.
  )))
  (% class="wikigeneratedid" %)
@@ -168,43 +168,14 @@
  = Instrument Response =
--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!).
++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.
--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.
++{{info}}
++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
++{{/info}}
--//(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.)//
++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.
--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
--
--##Channel Response
--    From M/S (Velocity) to COUNTS ()
--    Overall Sensitivity: 3.95452e+08 defined at 1.000 Hz
--    8 stages:
--        Stage 1: PolesZerosResponseStage from M/S to V, gain: 754.3
--        Stage 2: ResponseStage from V to V, gain: 0.25
--        Stage 3: CoefficientsTypeResponseStage from V to COUNTS, gain: 2.09715e+06
--        Stage 4: FIRResponseStage from COUNTS to COUNTS, gain: 1
--        Stage 5: FIRResponseStage from COUNTS to COUNTS, gain: 1
--        Stage 6: FIRResponseStage from COUNTS to COUNTS, gain: 0.99998
--        Stage 7: FIRResponseStage from COUNTS to COUNTS, gain: 1##
--
--
--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.
--
--##Channel Response
--    From M/S (Velocity) to COUNTS ()
--    Overall Sensitivity: 3.9546e+08 defined at 1.000 Hz
--    6 stages:
--        Stage 1: PolesZerosResponseStage from M/S to V, gain: 754.3
--        Stage 2: CoefficientsTypeResponseStage from V to COUNTS, gain: 524288
--        Stage 3: FIRResponseStage from COUNTS to COUNTS, gain: 1
--        Stage 4: FIRResponseStage from COUNTS to COUNTS, gain: 1
--        Stage 5: FIRResponseStage from COUNTS to COUNTS, gain: 0.99998
--        Stage 6: FIRResponseStage from COUNTS to COUNTS, gain: 1##
--
--
--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.
--
  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') ).
@@ -217,7 +217,7 @@
  [[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"]]
--[[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"]]
++[[Huddle test comparing a Trillium Compact 120 + TerraSAWR vs a Trillium Compact 120 + Nanometrics Centaur (M8.AUANU)>>image:TC120_ANU_vs_CENTAUR.png||data-xwiki-image-style-alignment="center"]]
  = ANU TerraSAWR (Gen 3, FW 3.5a, 2014- current) =
@@ -262,11 +262,6 @@
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  = TerraSAWR Specs =
@@ -317,11 +317,4 @@
  [[image:LPR battery.jpg]]
  )))
  )))
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Changes for page ANU Seismic Data Loggers

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