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ABSTRAKSeismometer mempunyai karakteristik seperti frekuensi natural, konstanta
damping, bandwidth frekuensi dan sensitivitas. Nilai dari besaran-besaran tersebut
berpengaruh dalam pengolahan data seismik, terutama parameter gempa bumi
seperti magnitudo, olah karena itu diperlukan kalibrasi sehingga dihasilkan
pengukuran yang valid. Kalibrasi seismometer adalah kalibrasi untuk
mendapatkan nilai sensitivitasnya. Penelitian ini bertujuan untuk mendapatkan
nilai paramater seismometer yaitu sensitivitas yang tertelusur ke satuan
international, dengan merancang sistem kalibrasi seismometer secara relatif
maupun absolut. Perancangan sistem kalibrasi dilakukan baik secara hardware
maupun software. Pada hardware dirancang sistem low noise digitizer dengan
ADC beresolusi 16 bit, sedangkan untuk pengolahan dan analisa data kalibrasi
digunakan software builder LabVIEW.
Dari data hasil kalibrasi tiga lokasi yang berbeda, kalibrasi relatif menggunakan
signal sinus 1 Hz di dapat bahwa sensitivitas seismometer TDV-23S mempunyai
nilai sebesar 1217,28 ± 3,42 V/m/s atau 0,25 % untuk nilai ketidakpastiannya
pada setiap komponen dan nilai konstanta damping 0,49.
ABSTRACTSeismometers have characteristics, such as natural frequencies, damping
constants, frequencies bandwidth, and sensitivities. The values of the
characteristics have very influential in determine of earthquake magnitude.
Therefore, calibration of seismometers is needed to obtain validated measurement.
This research is aimed to design calibration system either relative or absolute, in
order to obtain the sensitivity value that traceable to international units. The
calibration system design is done in hardware and software. On the hardware, is
designed low noise digitizer system with 16 bit resolution, for the processing and
calibration data analysis is used LabVIEW Software Builder.
The calibration test data from this research are seismic signals which are recorded
from three different locations. Results from testing on the entire seismic signals
show that relative calibration which is used sine signal of 1 Hz, gives 1217,28
±3,42 V/m/s sensitivity of TDV-23S seismometer is obtained, or uncertainty of
each component of 0,25% and the damping constant of 0.49.;Seismometers have characteristics, such as natural frequencies, damping
constants, frequencies bandwidth, and sensitivities. The values of the
characteristics have very influential in determine of earthquake magnitude.
Therefore, calibration of seismometers is needed to obtain validated measurement.
This research is aimed to design calibration system either relative or absolute, in
order to obtain the sensitivity value that traceable to international units. The
calibration system design is done in hardware and software. On the hardware, is
designed low noise digitizer system with 16 bit resolution, for the processing and
calibration data analysis is used LabVIEW Software Builder.
The calibration test data from this research are seismic signals which are recorded
from three different locations. Results from testing on the entire seismic signals
show that relative calibration which is used sine signal of 1 Hz, gives 1217,28
±3,42 V/m/s sensitivity of TDV-23S seismometer is obtained, or uncertainty of
each component of 0,25% and the damping constant of 0.49., Seismometers have characteristics, such as natural frequencies, damping
constants, frequencies bandwidth, and sensitivities. The values of the
characteristics have very influential in determine of earthquake magnitude.
Therefore, calibration of seismometers is needed to obtain validated measurement.
This research is aimed to design calibration system either relative or absolute, in
order to obtain the sensitivity value that traceable to international units. The
calibration system design is done in hardware and software. On the hardware, is
designed low noise digitizer system with 16 bit resolution, for the processing and
calibration data analysis is used LabVIEW Software Builder.
The calibration test data from this research are seismic signals which are recorded
from three different locations. Results from testing on the entire seismic signals
show that relative calibration which is used sine signal of 1 Hz, gives 1217,28
±3,42 V/m/s sensitivity of TDV-23S seismometer is obtained, or uncertainty of
each component of 0,25% and the damping constant of 0.49.]