The BSL has set up an instrumentation test facility in the Byerly Seismographic Vault in order to systematically determine and to compare the characteristics of up to eight sensors at a time. The test equipment consists of an eight-channel Quanterra Q4120 high-resolution data logger and a custom interconnect panel that provides isolated power and preamplification when required to facilitate the connection and routing of signals from the sensors to the data logger with shielded signal lines. Upon acquisition of the 100 samples-per-second (sps) data from the instruments under test, PSD analysis and spectral phase coherency analysis are used to characterize and compare the performance of each sensor. Tilt tests and seismic signals with a sufficient signal level above the background seismic noise are also used to verify the absolute calibration of the sensors. A simple vertical shake table is used to access the linearity of a seismic sensor.
The sensor testing facility of the BSL is described in detail in the 2001-2002 Annual Report.
Instruments tested during the past year included functional testing of a Streckeisen STS-2, an Episensor FBA-ES-T, a Guralp CMG-3T, a horizontal STS-1 and comparison testing of a pair of Metrozet accelerometers.
Berkeley Seismological Laboratory
215 McCone Hall, UC Berkeley, Berkeley, CA 94720-4760
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