Page 1: ...complies with IEC TC 29 169 WG 16 The other filter net works are U1 a proposed weighting which approximates the sensory perception of ul trasound Ultra a 12 5 kHz high pass filter Infra a 20Hz low pa...
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Page 5: ...lnfrasound and Ultrasound Filter Set Type 1627 From serial no 1177522 August 1985...
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Page 7: ...T DATA 1 2 CONTROLS 3 3 OPERATION 5 3 1 PRELIMINARY 5 3 2 POWER SUPPLY 5 Battery check 5 Battery replacement 6 Mains Power Supply and Charger ZG 0254 7 3 3 MEASUREMENT 7 General 7 Instrumentation 8 Me...
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Page 9: ...se outside the audible frequency range can have harmful effects In creasing awareness to this fact is just now giving rise to international mea surement standards ISO DIS 7196 BP0500 11 Infrasound and...
Page 10: ...e G2 Also proposed in ISO DIS 7196 this is an infrasound weighting curve which accounts for non specific reac tions and indirect effects Here the perception mechanism is non direct and is less depende...
Page 11: ...y of 12 5 kHz U Audio complies with IEC TC 29 169 WG 16 and allows measure ment of audible sound in the presence of ultrasonic noise Infra low pass filter for infrasound measurements with upper limiti...
Page 12: ...AA size These are connected in parallel with the batteries in the Sound Level Meter which supplies power to the Filter Set see section 3 2 If desired the battery drawer may be replaced by one fitted w...
Page 13: ...and Sound Level Meter together When correctly secured with the Sound Level Meter the two side latches should return to their outer position Fig 3 1 Filter Set with the Sound Level Meter Type 2231 3 2...
Page 14: ...atteries should be replaced Note One set of batteries either in the Sound Level Meter or in the Filter Set is sufficient for powering both instruments However the battery life is of course reduced For...
Page 15: ...geable To avoid confusion however only battery drawers equipped with rechargeable cells have the socket receiving the charger If both instruments con tain rechargeable cells it is necessary to use a s...
Page 16: ...er as the Random frequency correction is not valid for any mi crophone When mounted the Adaptor UC 5265 results in a 0 4 dB attenuation in the input stage which must be compensated for when calibratin...
Page 17: ...nt noise level of 2231 with 1627 10 100 500Hz 851152 Fig 4 1 Input Output phase shift with U1 Filter Po 270 180 90 0 90 180 270 360 10 100 cpo 90 0 90 180 270 360 450 1k 1 k 100k Hz 851154 Fig 4 2 Inp...
Page 18: ...0 400 Hz 851156 Fig 4 4 Input Output phase shift with Infra Filter 10 cpo 180 90 0 90 r 180 270 360 2 10 20 40 100 500Hz 851155 Fig 4 5 Input Output phase shift with G1 Filter 100 Hz 851153 Fig 4 6 In...
Page 19: ...s its correct function then its internal batteries should be removed to prevent risk of further damage For repair consult the separate Service Instruction Manual available for the Type 1627 or contact...
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Page 24: ...1627 Bri iel _ Kjcer DK 2850 N lERUM DENMARK 0 Telephone 45 2 800500 Telex 37316 bruka dk Printed in Denmark by Naerum Offset English OK BE 0936 11...
