Instruction Manual
SLM 52N
Sound Level Meter
FR
EN
IT
DE
ES
Un
Ov
Page 1: ...Instruction Manual SLM 52N Sound Level Meter FR EN IT DE ES Un Ov...
Page 2: ...6 12 ADJUSTMENT DATA FOR CALIBRATOR B K TYPE 4226 PRESSURE MODE 16 13 TYPICAL INSTRUMENT FREQUENCY RESPONSE AT 0 INCIDENCE 16 14 TYPICAL FREQUENCY RESPONSE DUE TO CASE REFLECTIONS AT 0 INCIDENCE 17 15...
Page 3: ...ht during storage and use Protect the instrument from air with high salt or sulphur content gases and stored chemicals as this may damage the delicate microphone and sensitive electronics Always turn...
Page 4: ...t suitable for use with a frequency analyzer level recorder FFT analyzer graphic recorder etc 3 MEASUREMENT PARAMETERS The following parameters are used on the instrument LA A frequency weighting soun...
Page 5: ...e with IEC 61672 1 A weighted 1000Hz 30dB to 130dB Level range selection 5 ranges in 10dB steps 30 to 90dB 40 to 100dB 50 to 110dB 60 to 120dB 70 to 130dB LINEAR OPERATING RANGES L O R RANGE 30 90 dB...
Page 6: ...0 1000 A 60 0 120 0 C 60 0 120 0 4000 A 60 0 120 0 C 60 0 119 2 8000 A 60 0 118 9 C 60 0 117 0 RANGE 70 130 dB Test starting point 104 dB for all weightings and frequencies except 31 5Hz A weighted f...
Page 7: ...vel for the diffuse field 94 0dB Frequency for acoustic testing 8000Hz Warm up time 2min Sampling interval Bar graph indication 125 ms approx Numeric indication 1 sec approx Microphone equivalent elec...
Page 8: ...50 100 200 500 1000 2000 5000 10000 20000 Hz Freq units 31 5 Hz 63 Hz 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz dB 0 1 0 4 0 0 0 5 0 2 0 0 0 2 0 0 0 5 Typical diffuse field response for ran...
Page 9: ...d frequency weighting Output voltage 1Vrms at full scale of the range Output impedance 5k Load impedance 1M DC output Output voltage 10mV dB Output impedance 5k Load impedance 1M Power requirements On...
Page 10: ...m for 80 modulation at 1KHz IEC 61672 1 Instrumentation standard classification group X and performance class 2 sound level meter No permanent degradation of performance loss of function change of op...
Page 11: ...shows the sound level as a numeric value and a bar graph The display also shows the operation mode of the instrument the selected measurement parameters warning indications 3 Button Turns the meter o...
Page 12: ...ns select the memory address to be displayed 10 DC AC output AC output signal with frequency weighting DC output signal corresponding to sound level 11 External DC 9V power supply jack Type 1 3 coaxia...
Page 13: ...A C A Frequency weighting or C Frequency weighting indicator 6 Ov Over range indicator for processed value 7 Ov Over range indicator 8 Battery capacity indicator 9 FAST Fast time weighting indicator...
Page 14: ...batteries press the button to turn off the instrument Remove the cover of the battery compartment Insert the new 9V battery Replace the battery cover Press the button to turn on the instrument and che...
Page 15: ...ilar wind noise and strong air movements at the microphone can cause measurement errors Such effect can be reduced by using the windscreen Windscreen 4 Tripod Mounting For long term measurements the i...
Page 16: ...1000Hz sound calibrator in its nominal 94 dB level setting 8 Adjust the CAL potentiometer of the instrument until the display reading for diffuse field is the same as the certified pressure level of t...
Page 17: ...during measurement the Ov or Un indication is shown on the display to indicate that over range or under range data were included in the sound level measurement values for processing 8 Press the MAX bu...
Page 18: ...d time weighting settings of the instrument Output voltage 10mV 0 1mV dB Output impedance approx 5k Load impedance 1M The output voltage when the instrument is reading 94dB is nominally 0 94V DC 12 AD...
Page 19: ...TECH 52N meter fitted with an MC 21 microphone as per IEC 61672 1 and IEC 60651 relative to 1000Hz 15 TYPICAL FREQUENCY RESPONSE OF 65mm WINDSCREEN AT 0 INCIDENCE Freq units 31 5 Hz 63 Hz 80 Hz 100 Hz...
Page 20: ...nt is a pressure sensitive type it should be equally sensitive in all directions However refraction and cavity effects cause certain microphone directional characteristics at high frequencies The diag...
Page 21: ...0o 180o 270o 330o 60o 210o 120o 240o 300o Directional characteristics for frequency equal to 2000Hz 25 0 20 0 15 0 10 0 5 0 0 0 5 0 10 0 dB 30 o 0o 90o 150o 180o 270o 330 o 60 o 210o 120 o 240 o 300 o...
Page 22: ...120o 240o 300o Directional characteristics for frequency equal to 8000Hz 17 APPENDIX A FREQUENCY WEIGHTING NETWORK The SLM 52N provides frequency weightings A and C The electrical characteristics of t...
Page 23: ...the above mathematical operation looks as follows ei Power of 2 ei2 1 0 T T z ei2 ei2 E rms Input Voltage Output Voltage During sound level measurements the level often fluctuates drastically which wo...
Page 24: ...e constant which equals CR The response of the index averaging circuit to a single burst signal is shown below C R Input voltage C R Output voltage Equivalent electrical circuit ei ei eo eo ei Input v...
Page 25: ...han 10dB the values shown in the table below may be used for compensation to estimate the level of the target sound Background noise compensation Display reading difference with and without target sou...
