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Last modified by robert on 2026/06/29 16:42
From version 110.15
edited by Jack Dent
on 2026/06/15 10:52
Change comment: (Autosaved)
To version 115.1
edited by robert
on 2026/06/29 08:23
Change comment: There is no comment for this version

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1 -XWiki.JackD
1 +XWiki.robert
Content
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73 73  
74 74  If you come to collect your node and it is missing~-~- LOOK FOR IT! It may not have gotten far. We have found dozens of nodes by spending 15 minutes looking for them.
75 75  
76 += External Power =
77 +
78 +Both the 5Hz IGU-16HR and 5s BD3C-5 can be optionally powered via external battery via either a replacement bottom half (the 5Hz nodes) or a battery cable accessory (BD3C-5) using standard lead acid batteries from 9-36v. We have done preliminary testing at 250 Hz with a 12v battery:
79 +
80 +- BD3C-5: ~~2 days of recording per 1 Ah
81 +
82 +- IGU16-HR 3C:  ~~3.5 days of recording per 1 Ah
83 +
84 +- IGU16-HR 1C: ~~7 days of recording per 1 Ah
85 +
86 +Of course, these can also be fit with a solar panel & charge controller which would then theoretically keep them going indefinitely (limited only by the disk storage, which at 250 Hz could be on the order of 12 months).
87 +
76 76  = **Installation** =
77 77  
78 78  (% class="box infomessage" %)
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99 99  
100 100  **Site Analysis**:
101 101  
102 -* **Take compass measurements away from the sensor as it will affect your measurement.**
103 -* Take photographs from various angles to document the site setup thoroughly.
104 -* Include a detailed site description in your notes
114 +* **Take compass measurements away from the sensor as it will affect your measurement. Use a stick or shovel to help align.**
115 +* Take photographs from various angles to document the site setup thoroughly. Have a colleague stand next to it pointing at it.
116 +* Include a detailed site description in your notes.
105 105  
106 106  == 3. GPS Considerations ==
107 107  
108 108  (% class="wikigeneratedid" %)
109 -The GPS antenna is at the top and center of the unit, and will (usually) only receive signal with a clear sky view directly above. The signal is able to penetrate plastic and terracotta planters and a thin layer of soil, but may struggle if the soil layer is too thick. **These nodes will not start recording without attaining a GPS lock** and repeated attempts will excessively drain the battery.
121 +The GPS antenna is at the top and center of the unit, and will (usually) only receive signal with a clear sky view directly above. The signal is able to penetrate plastic and terracotta planters and a thin (2 cm?) layer of soil, but may struggle if the soil layer is too thick. **These nodes will not start recording without attaining a GPS lock** and repeated attempts will excessively drain the battery.
110 110  
111 111  == 4. Visibility and Location Marking ==
112 112  
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114 114  
115 115  **GPS Marking**:
116 116  
117 -* Use a GPS device to mark the instrument's exact location.
118 -* Record this location in both your paper notes and the GPS device.
129 +* Use a GPS device to mark the instrument's exact location. Most modern cell phones can get to about a 3m error with their internal GPS also; you can probably also get away with investing a few dollars in a good app that shows error and lets you log markers.
130 +* Also write the GPS down on paper (ie your [[LOG SHEET>>http://auspass.edu.au/field/NODES_blank_fieldlog.pdf]]).
119 119  
120 120  == (% style="color:inherit; font-family:inherit; font-size:max(18px, min(20px, 14.4444px + 0.462963vw))" %)5. Charge Time, Pre-Deployment & Post-Deployment(%%) ==
121 121  
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422 422  
423 423  We are aware that there are various different published responses for these instruments and trust very few of them. One has to be careful with how polarity is handled between groups as well, and if one is working in integer counts (the ANSIR default) or mV (unclear why anyone would use this as it makes file sizes enormous). The response information published below is in **counts** and seems to fit well in huddle tests. Note that the response is the same for all channels and all units (e.g. there are no bespoke calibrations!), all appear to be sample rate insensitive, and the IGU data has been inverted (multiplied by -1) as described here: [[5Hz Node Polarity Issues>>https://auspass.edu.au/xwiki/bin/view/Data/AusPass%20Data/#HSmartSoloNodePolarityIssues]]
424 424  
437 +(% class="wikigeneratedid" %)
438 +//A small note on the y-axis scale of the following plots: We are aware that raw velocity is typically scaled ~~1e-6. This data has been filtered and selected for especially quiet regions so has lower amplitude. The key point is showing the match with the known CMG-6TD and Centaur data.//
439 +
425 425  == IGU 16HR-3C ==
426 426  
427 427   '16HR3C': {'poles':[(-22.211059+22.217768j), (-22.211059-22.217768j)],