B&K 1606, Instructions And Applications

Page 1: ...ombination with the B K accelerometers and indicating instruments Meas urement of acceleration velocity and displace ment Built in shaker table for calibration of complete measuri11g arrangement Nceru...

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Page 3: ...Vibration Pick up Preamplifier Type 1606 Reprint March 1967...

Page 4: ...ting Frequency 6 Integrating Networks 6 Frequency and Dynamic Ranges 8 Built in Shaker Table 9 Operation 10 Measuring Arrangement 10 CaHbration of Measuring System 12 Adjustment to the Vibration Signa...

Page 5: ...of a two stage amplifier a set of integrat ing networks and a built in shaker table for calibration purposes The input impedance of the amplifier is made high to ensure a low cut off frequency of the...

Page 6: ...adjusted for maximum amplification position 10 The influence on the frequency characteristic can be seen in Fig 2 where the response is reproduced for three different db I Odb l ype 1606 1 2 y ___ v...

Page 7: ...ifier pas Acceleration Volt peak 2 1188 Fig 3 Typical nonlinear distortion of the Preamplifier at mmzmum and maximum amplification The curves are valid for the frequencies 20 Hz c s 20 kHz kc s and wi...

Page 8: ...city the input resistance of the Preamplifier determines the lower limiting frequency of the combination Accelerometer plus Preamplifier In Fig 2 the frequency responses at the lower frequencies are s...

Page 9: ...as a measurement of acceleration 0 db 10 20 30 40 c c 50 Lo1 2 5 Frequency 10 20 50 100 200 500 1000 2000 C s 5000 10000 f i8038 Fig 5 Amplitude versus frequency characteristics of integrating network...

Page 10: ...for Displacement Frequency and Dynamic Ranges As the networks cannot be used below their low frequency cut off indicated on the curves in Fig 5 the integra tion switch is for the different positions w...

Page 11: ...the highest permissible Lower Limiting Frequency position of the switch will give the most satisfactory result The time constants RC for the different networks are chosen to be 10 1 w 2 and 10 3 whic...

Page 12: ...instrument Measuring arrangements illustrating the means of connection to the various instruments are shown in Fig 9 When a recording of the measurements is desired the above mentioned instruments can...

Page 13: ...nput switch of the indicating instrument should likewise be set to position Condenser Microphone Typical frequency characteristics of the measuring arrangements used under the above condition are show...

Page 14: ...cable connecting the Accelerometer to the Pre amplifier should if possible not be extended Calibration of the Measuring System To calibrate the measuring arrangement the built in shaker table can be...

Page 15: ...bration amplitude of the shaker table will be increased The vibration of the shaker table is to some degree affected by the touching of the Preamplifier s control knobs therefore when checking the rat...

Page 16: ...o the Preamplifier with control knob Attenuation 4 Select RMS Average or Peak half peak to peak type of detection by the Meter Switch on the indicating apparatus If the B K Level Recorder Type 2305 is...

Page 17: ...ty Lower than 15 mV G The read value in Volts X the value 10 or 102 em sec indicated by the position of the Integration Switch X 10 X the value indicated by switch Attenuation on Preamplifier Example...

Page 18: ...m of the vibration signal is derived as stated in item 1 above except for the fact that the result should be multiplied by tO Example The settings and read value are the same as in example 1 The ampli...

Page 19: ...eak when Sensitivity Adjustment is in posi tion 10 max amplification 10 V peak when Sensitivity Adjustment is in posi tion 0 min amplification Hum and Noise Level 12 t tV approx referred to Input at m...

Page 20: ...35 4334 I 4334 4335 I 4335 cm sec2 Hz kHz 1 1 I 3 2 em sec Hz 12 18 0 03 o 1 3 o Oo3 o o1 30 ft Hz I kHz 20 I 60 3 1 o 2 0 6 30 I 3 o Qo3 o o1 300 I 10 1 10 meters 40 X t0 8 inches Maximum Level 4332...

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Page 24: ...Orboe Print Copenhagen M r c h 1967...