hugh.radkins@LIGO.ORG - posted 11:52, Tuesday 09 December 2014 - last comment - 12:14, Wednesday 10 December 2014(15510)
STS2 Grund Seismos A & C put into igloos this morning
These instruments have just been sitting on thefloor with no insulation so Krishna Jim and I got them under Trillium igloos. We had trouble with the internal Cable routine and may revisit to improve that.
Comments related to this report
krishna.venkateswara@LIGO.ORG - 16:46, Tuesday 09 December 2014 (15517)
The seismometers may be a little better - I've attached a pdf showing the X, Y, Z channels on the HAM2, HAM5 and ITMY seismometers and the coherence between them.
ITMY in particular looks significantly different and shows much less coherence than it probably should. It also refuses to zero out very well when the 'zero' button is hit on the control unit for the seismometer.
An overnight measurement may be a bit more illuminating.
The data from last night looks about the same. Plots are attached. The ITMY_Z and HAM2_Y channels look odd at low frequencies. The rest look reasonable.
Jim, Hugh and I checked the U,V,W outputs from the seismometers and confirmed that they were within the +/- 2 V spec described in the STS-2 manual.
The seismometers may be a little better - I've attached a pdf showing the X, Y, Z channels on the HAM2, HAM5 and ITMY seismometers and the coherence between them.
ITMY in particular looks significantly different and shows much less coherence than it probably should. It also refuses to zero out very well when the 'zero' button is hit on the control unit for the seismometer.
An overnight measurement may be a bit more illuminating.
J. Warner, H. Radkins, K. Venkateswara
The data from last night looks about the same. Plots are attached. The ITMY_Z and HAM2_Y channels look odd at low frequencies. The rest look reasonable.
Jim, Hugh and I checked the U,V,W outputs from the seismometers and confirmed that they were within the +/- 2 V spec described in the STS-2 manual.