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Summary of Contents for Kinemetrics MBB-2
- Page 1 MBB-2 U 305601, R ANUAL OCUMENT EVISION Document 305601 Revision: A May 2024...
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Page 2: Warranties, Disclaimers & Trademarks
Kinemetrics Inc. Disclaimer Kinemetrics Inc., sometimes referred to as KMI, shall have no liability or responsibility to you or any other person or entity with respect to any liability, loss or damage caused or alleged to be caused directly or indirectly by this documentation or the software described in it. -
Page 3: Contact Information
90 days for workmanship. CAUTION: The MBB-2 is a self-contained triaxial seismometer. There is no reason to open or modify the sensor. There are no manual adjustments to make to, nor are there any user-serviced parts within the sensor. -
Page 4: Table Of Contents
5.1. MBB-2 Ground Motion Response ....................7 5.2. MBB-2 Internal Calibration Circuit Response ................9 5.3. MBB-2 Frequency Response using Electrical Calibration ............11 5.4. Example: Frequency Response Measurement & Processing ............ 12 5.4.1. Calibration Instrumentation Parameters ................12 5.4.2. -
Page 5: Safety
MBB-2 unit can be powered by an 9-36 VDC source. Optional Power Supply Assembly If you plan to power the MBB-2 from a Kinemetrics digitizer using the mains supply, we recommend Kinemetrics’ Power Supply Assembly (PSA)(KMI 112251-PL or KMI 112259-PL for use with SLA Battery.) Plug the PSA’s power cord into AC outlets that will not apply more than 260 V... - Page 6 Do not operate the equipment in an atmosphere of explosive gases. The Kinemetrics MBB-2 is not To Be Used for Life Support or Life-Critical Systems These products are not designed for operating life critical support systems and should not be used in applications where failure to perform can reasonably be expected to create a risk of harm to property or persons (including the risk of bodily injury and death).
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Page 7: Introduction And Instrument Description
EVISION 1. Introduction and Instrument Description The MBB-2 is a triaxial broadband seismic sensor that provides a velocity-sensitive passband from 120 seconds to approximately 160 Hz. The sensor is packaged in a 316 stainless steel housing, to allow reliable operation in a shallow borehole or posthole. -
Page 8: Mbb-2 Cabling
Ground reference for CAL_EN and PER_SW_EN lines Input 1) No internal connection in standard MBB-2 version. Can be connected to ANALOG_GND on request. 2.2. MBB-2 Cabling The MBB-2 is available with two versions of cabling. Both cables provide an oceanographic-grade mating plug for connection to the sensor. -
Page 9: Pigtailed, 40-Meter Cable
MBB-2 U 305601, R ANUAL OCUMENT EVISION CAL_EN Enable line for calibration mode; connects CAL input to sensors; 3-10V input range PER_SW_EN Enable line for 1 second “setup” mode; 3-10V input range; 3-10V input range ENABLE_GND Ground reference for CAL_EN and PER_SW_EN lines... -
Page 10: Compatibility With Mbb-1 Cabling
This uses an additional conductor (for CAL_INPUT_MINUS) in the cable. As a result of these changes, the MBB-2 cable (red overmolding) must be used to exercise the full functionality of the sensor. The MBB-2 sensor is operational with an MBB-1 cable (blue overmolding); however, one cannot exercise the period switching (controlled by PER_SW_EN) or calibration (controlled by CAL_EN) modes, without using the MBB-2 cable. -
Page 11: Galvanic Isolation
MBB-2 U 305601, R ANUAL OCUMENT EVISION 3.2. Galvanic Isolation The input power pins (INPUT_POWER_PLUS and INPUT_POWER_RETURN) are galvanically -isolated from other connections in the sensor. Similarly, the enable lines (PER_SW_EN, CAL_EN, and ENABLE_GND) are galvanically isolated from all other connections. -
Page 12: Deployment Hardware Interfaces
(where the sensor body can be held). Figure 1: Details of attachment points on MBB-2 top cap. Qty. 4 of 10-32 UNF holes are available for attachment. The pair of 0.127” holes can be used for precise azimuth alignment of tooling that is attached to the sensor top cap. -
Page 13: Mbb-2 Ground Motion Response
ANALOG_GND. The differential input impedance of the CAL signal conditioning circuitry is approximately 400K. Upon entry of the stimulus signal into the MBB-2, the internal electronics are designed to condition the signal into a velocity-equivalent signal. Specifically, the sensor’s electronic circuitry is responsible for generating an output current that is directly proportional to the time derivative of the CAL input voltage. - Page 14 MBB-2 U 305601, R ANUAL OCUMENT EVISION ���� = unit imaginary number | ⋯ | = magnitude defined by | ���������������� + ���� ∙ ���� ���� �������� | = ����������������� + ���� ���� �������� ���� = generator constant in Volt per meter per second = 750 ±...
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Page 15: Mbb-2 Internal Calibration Circuit Response
Figure 3: Nominal response to ground excitation; blue: Z component, orange: N and E component – Phase in degrees. 5.2. MBB-2 Internal Calibration Circuit Response As mentioned before, the internal calibration circuit (i.e., “calibrator”) of the MBB-2 has its own poles and zeros which must be taken into account when performing an electrical calibration measurement. The calibrator response is defined by the following set of complex poles and zeros NOTE: These are valid only for calibrator version 3. - Page 16 MBB-2 U 305601, R ANUAL OCUMENT EVISION is a scaling constant depending on the power transmission to the pendulum [pendulum acceleration]/[calibration input voltage] and the calibration circuit gain. ∏ ( ���� = ���� ∙ ���� ∙ ⋯ ∙ ���� ; ����...
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Page 17: Mbb-2 Frequency Response Using Electrical Calibration
Figure 5: Calibrator response function. Used for correcting responses obtained via electrical calibration – Phase in degrees. 5.3. MBB-2 Frequency Response using Electrical Calibration With the aid of the calibrator response, it is possible to calculate the nominal calibration response of the MBB-2: ��������������������_������������... -
Page 18: Example: Frequency Response Measurement & Processing
MBB-2 U 305601, R ANUAL OCUMENT EVISION Figure 6: Plots of TFCal_Nom(s) and TFGnd_Nom(s); Magnitude, dB Figure 7: Corresponding phase (degrees) graphs. 5.4. Example: Frequency Response Measurement & Processing 5.4.1. Calibration Instrumentation Parameters Before performing any electrical calibration, the user is advised to adhere to some basic guidelines and... -
Page 19: Mbb Calibration Circuit Versions
5.4.2. MBB Calibration Circuit Versions Three versions of internal passive calibration filters exist among the MBB-2 sensors. They can be recognized by the first three digits of the sensor serial number. In the list below, “nnn” is used as the placeholder for the remaining part of the serial number. -
Page 20: Quick Compliance Check
From Figure 8 through Figure 11, the magnitude and phase diagrams of two examples of successful compliance tests, one for the low-frequency range (data acquired by a Q330 of Quanterra, sampling rate 40 Hz) and one for the upper frequency range (Kinemetrics SA lab-based test equipment, sampling rate 5 kHz) are shown. - Page 21 MBB-2 U 305601, R ANUAL OCUMENT EVISION Figure 8: Magnitude of measured (black) and nominal Z (blue) electrical calibration response. The red arrow denotes the 1-Hz data bins embedded in the two response graphs that have been used as references for scaling.
- Page 22 MBB-2 U 305601, R ANUAL OCUMENT EVISION Figure 10: Magnitude of measured (black) and nominal N/E (blue) electrical calibration response. The red arrow denotes the 1- Hz data bins embedded in the two response graphs that have been used as references for scaling.
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