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DetChar (General)
Shimoda, Araya, Hayama - 0:19 Saturday 16 April 2016 (1547) Print this report
Comment to Wrong input filters for BS EX EY seismometers (1537)

Today I changed the digital filters of seismometers at 2016/4/15 22:30 JST. The output unit has been changed.


for BS,EX,EY (Trillium Compact)

 - output signals are in unit of velocity [m/s]   ( output channels: K1:PEM-BS(/EX/EY)_SEIS_NS(/WE/Z)_SENSINF_OUTPUT )

 - frequency band : 0.012-80Hz (+-1dB region)

for MCF (RION)

 - output signal is in unit of acceleration [m/s^2] ( output channel: K1:PEM-MCF_SEIS_Y_SENSINF_OUTPUT )

 - frequency band : 0.1-100Hz (+-1dB region)


The frequency dependence of seismometer's response is not corrected. So the filter is valid only for each frequency band (written above). If the correction is necessary, please see the manual. Attatched file is Trillium manual.

The source impedance of Trillium is 150[ohm], and the input impedance of digital system is 10k[ohm]?  so the signal can become ~97% of original output. It should be calibrated if necessary.



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