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Related Manuals for HBM B12
Summary of Contents for HBM B12
- Page 1 Mounting instructions Acceleration Transducer B 26.B12.10 en...
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Page 3: Table Of Contents
..........HBM 17.2.2000... -
Page 4: Safety Instructions
General dangers of failing to follow the safety instructions The B12 acceleration transducer corresponds to the state of the art and is fail-safe. The transducers can give rise to residual dangers if they are inappropriately installed and operated by untrained personnel. - Page 5 Refers to the fact that important information is being given about the product or its use. Symbol: Meaning: CE mark The CE mark signals a guarantee by the manufacturer that his product meets the requirements of the relevant EC directives (see Declaration of conformity at the end of this document). HBM 17.2.2000...
- Page 6 Protect the transducer from damp and weather influences such as rain, snow, etc. Maintenance The B12 acceleration transducer is maintenance free. Accident prevention Although the specified nominal force in the destructive range is several times the full scale value, the relevant accident prevention regulations from the trade associations must be taken into consideration.
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Page 7: Scope Of Supply
Scope of supply 1 Acceleration transducer B12 1 Mounting instruction Application The Type B 12 range of acceleration transducers can be used for measuring vibration and shock accelerations as well as constant acceleration. They are both small and light which makes them ideal for mounting on small test sub- jects. -
Page 8: Construction And Mode Of Operation
At the opposite end to the mounting stud are the four pins of the HS 31 P plug for the electrical connections. The centre of gravity of the mechanism is approximately in the middle of the cylindrical part of the body and the direction of measurement is along the body axis. Fig. 1 Construction HBM 17.2.2000... -
Page 9: Installation
When an HK 31 S connector is used it makes the body splashproof (degree of protection IP 54 to DIN 40050). In order to obtain good results it is advisable to use HBM connecting leads, a choice of which is given in the table below. - Page 10 The B 12 transducers can be used with any HBM 5 kHz carrier frequency am- plifier or the MC 2 measuring converter, although the relevant cut–off frequen- cies must be noted.
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Page 11: Calibration
Fig. 3 Calibration For measurements of the highest accuracy, all B 12 transducers should be ca- librated within the range of the anticipated reading. When measurements are taken over extended periods of time, regular recali- bration is advisable. HBM 17.2.2000... -
Page 12: Notes On Use
With inductive acceleration transducers the cable effects depend on the parti- cular type of cable employed. When HBM cables are used there is no detectable effect on the sensitivity un- til they are more than 100 m long. The effect of a long cable can be compensated for by connecting it before the calibration is carried out (see section 4). -
Page 13: Appendix
The relation between the acceleration to be determined and the relative dis- placement of the mass measured can be derived mathematically from the force equilibrium condition of the oscillatory system (Σ F = 0). HBM 17.2.2000... - Page 14 An above–resonance system as used for measuring acceleration has a stiff spring with a low damping constant and low mass. In the system equation, predominates and gives approximately: ω r = – a The relative displacement is proportional to the acceleration. The transfer sensitivity reduces by 1/ω HBM 17.2.2000...
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Page 15: Amplitude-Frequency Relationship
With a damping factor of 0.6 to 0.7 this is the case in the range up to 50% of the characteristic frequency (ω/ω = 1). Varying the damping factor restricts the effective working frequency range. Working frequency range Fig. 5 Amplitude response D for B12: 0,6" 0,1 HBM 17.2.2000... -
Page 16: Temperature Sensitivity Of Damping
Fig. 6. The reference temperature of the B 12 transducers is 23 Fig. 6 Temperature sensitivity of damping D for B12: 0,6" 0,1 7.4 Signal delay With any transducer the output signal is delayed slightly from the input accele- ration (Fig. 7). -
Page 17: Phase Displacement
(phase frequency response). Fig. 8 Phase frequency response D for B12: 0,6" 0,1 7.4.2 Transit time Fig. 9 shows the relation between the normalized transit time for various dam- ping factors and the normalized angular frequency. The curves are derived from the phase frequency response (Fig. -
Page 18: Relationship Between Vibration Displacement
0.6 for the reference temperature (23 C), the transit times in the working frequency range are approximately equal. The acceleration is then accurately reproduced. The transit times for the B12 transducers are given in the table below. Working frequency- range Fig. -
Page 19: Technical Data
Direction of measurement selectively along the body axis, anywhere in the field of gravity Mechanical principle of measurement subcritical mechanical oscillating Types B12/200 B12/500 Characteristic frequency appr. Working frequency range 0...100 0...250 Damping factor D at reference tempera- 0.6 "0,1 ture "200... -
Page 20: Dimensions
Types B12/200 B12/500 2.5 "5% Nominal excitation voltage (r.m.s) Operating range of the excitation volta- 1...6 ge (r.m.s) Carrier frequency Input resistance at reference tempera- ture (between points 2 and 3) ca. 40 Input inductance at reference tempera- ture (between points 2 and 3) ca. - Page 21 HBM 17.2.2000...
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- Page 23 HBM 17.2.2000...
- Page 24 Modifications reserved. OTTINGER ALDWIN ESSTECHNIK All details describe our products in HBM Mess- und Systemtechnik GmbH general form only. Postfach 10 01 51, D-64201 Darmstadt They are not to be understood as express Im Tiefen See 45, D-64293 Darmstadt warranty and do not constitute any liability Tel.: +49/ 61 51/ 8 03-0;...
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