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<div class="moz-cite-prefix">We've encountered it on two instruments
so far. We tried loosening the bolt at one station and the signal
seems back to normal. Waveform image attached.<br>
<br>
--jon<br>
<br>
<br>
On 4/25/19 11:51, Smith, James wrote:<br>
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cite="mid:CA+jwBa0g+ri9pwJY9u18PA2ymYxQqbBxs=U+xd-N7-x+GYKfbg@mail.gmail.com"
type="cite">
<div dir="ltr">Hello ANSS group,
<div><br>
</div>
<div>I have experienced "buzzing" issues with the ETNA2, and
found out CGS encountered a similar problem. Just wondering if
anyone else has had this issue with the units. Here is a
response given by KMI support to CGS regarding the matter: </div>
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<div>" <span style="font-family:Arial,sans-serif">Listening to
the video and the fact that putting a finger on the unit
suggests that at least one of the EpiSensor components is
oscillating. We had one report of this but were unable to
duplicate the problem with the unit as returned which
functioned normally even after over-torquing the hold-down
nut. Do we know if this unit was torques with a torque
wrench or by hand? I'm not sure who at KMI said it couldn't
be the bolt pressure but certainly if sufficient torque is
exerted the case can be deformed which could result in the
sensors going into oscillation. Hence, the essential
question is was this over-torqued or are some units
susceptible to this at our suggested torque.</span> " </div>
<div>r/Jim</div>
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Jim Smith
<div>
<div>USGS-ESC</div>
<div>345 Middlefield Rd. MS 977</div>
<div>Menlo Park, CA 94025</div>
<div>(650) 329-4770 (office)</div>
<div>(650) 229-4673 (cell)</div>
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<pre class="moz-signature" cols="72">--
===================================
Jon Rusho
Seismic Network Engineer
University of Utah Seismograph Stations
<a class="moz-txt-link-abbreviated" href="mailto:jon@seis.utah.edu">jon@seis.utah.edu</a>
801-585-5523
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