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Last modified by robert on 2026/02/27 19:58
From version 105.4
edited by robert
on 2026/02/17 15:44
Change comment: There is no comment for this version
To version 105.2
edited by robert
on 2026/02/17 12:43
Change comment: There is no comment for this version

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444 444   'gain':1.69726e-05,
445 445   'sensitivity': 702651512.6046528}
446 446  
447 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:BD3C_Z_huddle.png]]
447 +*image TBA but they have been created in the past~-~- we are 100% confident our published responses are correct
448 448  
449 -[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:BD3C_N_huddle.png]]
449 +== Horizontal noise & how to avoid ==
450 450  
451 -== IGU-16 Horizontal noise & how to avoid ==
451 +The 5 Hz nodes are susceptible to horizontal noise due to the placement of geophones in the units, **but this can be mitigated by completely burying the units flush with the ground.** In the below example, the node was set on the floor of our basement set on its plastic carrying case support. As such the amount of horizontal noise noticeably increases above ~~ 10Hz.
452 452  
453 -The** 5 Hz nodes** are susceptible to horizontal noise due to the placement of geophones in the units, **but this can be mitigated by completely burying the units flush with the ground.** In the below example, the node was set on the floor of our basement set on its plastic carrying case support. As such the amount of horizontal noise noticeably increases above ~~ 10Hz.
453 +[[Power spectrum huddle test vs a CMG-6TD (S1) and TC120/Centaur combo. The N and E channels have excess noise above 10Hz due to "sticking up" out of the ground.>>image:IGU16_spectrum.png]]
454 454  
455 -[[IGU-16HR-3C Power spectrum huddle test vs a CMG-6TD (S1) and TC120/Centaur combo. The N and E channels have excess noise above 10Hz due to "sticking up" out of the ground.>>image:IGU16_spectrum.png]]
456 -
457 -(% class="wikigeneratedid" %)
458 -The BD3C-5 nodes do not have this issue:
459 -
460 -[[BD3C-5 test, as above. There is no additional noise on the horizontal channels.>>image:BD3C_psd.png]]
461 -
462 462  = **Cleaning** =
463 463  
464 464  When assembled, the nodes are water resistant but not submersible. They can handle a good spray and wipe-down. A stiff plastic brush is helpful to reach areas between the metal spikes on the bottom.
BD3C_N_huddle.png
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