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Last modified by robert on 2026/02/27 19:58
From version 103.1
edited by robert
on 2026/02/16 17:55
Change comment: There is no comment for this version
To version 105.1
edited by robert
on 2026/02/17 12:38
Change comment: There is no comment for this version

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... ... @@ -427,12 +427,14 @@
427 427   'gain':1,
428 428   'sensitivity': 257019225.55108312}
429 429  
430 -[[X axis is samples (.01 s), Y axis is velocity (m/s)>>image:IGU16_Z_huddle.png]]
430 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:IGU16_Z_huddle.png]]
431 431  
432 -[[X axis is samples (.01 s), Y axis is velocity (m/s)>>image:IGU16_N_huddle.png]]
432 +[[X axis is samples (.01 s), Y axis is velocity (m/s), 0.5-5 Hz filter>>image:IGU16_N_huddle.png]]
433 433  
434 434  == IGU 16-1C ==
435 435  
436 +The 1C nodes seem to have a slightly different response to the 3C (TBA)
437 +
436 436  == BD3C-5 ==
437 437  
438 438   'BD3C': {'poles':[(-1720.4+0j), (-1.2+0.9j), (-1.2-0.9j)],
... ... @@ -440,15 +440,17 @@
440 440   'gain':1.69726e-05,
441 441   'sensitivity': 702651512.6046528}
442 442  
445 +*image TBA but they have been created in the past~-~- we are 100% confident our published responses are correct
446 +
443 443  == Horizontal noise & how to avoid ==
444 444  
445 445  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.
446 446  
447 -[[Power spectrum huddle test vs a CMG-6TD (S1) and TC120/Centaur combo, all filtered 0.5-5 Hz. The N and E channels have excess noise above 10Hz due to "sticking up" out of the ground.>>image:IGU16_spectrum.png]]
451 +[[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]]
448 448  
449 449  = **Cleaning** =
450 450  
451 -When assembled, the nodes are water resistant but not submersible. They can handle a good spray and wipe-down. A strong, non-wire brush is helpful to reach areas between the metal spikes on the bottom.
455 +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.
452 452  
453 453  = **Weights (for shipping)** =
454 454