Tuesday, October 14, 2008

7 Range Sound Level Meter

The photos below show one of the two different sound level meters that I own. The meter is used to measure sound intensity and for analysis of in room acoustical environment for optimal placement of components and and speaker and proves to be a very versatile instrument. If you are serious about obtaining the most from your hi-fi system the you should have one of these instruments in your armoury.

This meter features include:

  • 7 sound level ranges - allowing measurements from 50 ~ 126dB (referenced to 0.0002ubar);
  • A and C Weightings - Let's you check using different ratings for acoustical analysis in different environments;
  • Slow and fast response settings - Choose from a delayed hang time meter response or a fast meter response;
  • RCA Output Jack - for connection to home system or other test equipment such as a spectrum analyser to check frequency responses at given locations;
  • Threaded Insert - allowing for stabilized mounting on top of a camera tripod for stability and accurate readings.

Switch Setting:- Range of Measurement:
60dB- 50-60dB
70dB- 60-76dB
80dB- 70-86dB
90dB- 80-96dB
100dB- 90-106dB
110dB- 100-116dB
120dB- 110-126dB

Accuracy: +/- 2dB @114dB
Standard: 0 dB = 0.0002ubar
Weighting: A & C
Response: Fast and slow
Signal: Output 1.0 Volt (peak) minimum into open circuit, with full scale meter
deflection at 1 kHz
Battery: Check Tests good from 7.0 to 10.5 Volt DC
9V Battery Life: 110 working hours (alkaline battery)
Size: 6 1/4 x 2 7/16 x 1 3/4 inches
Weight: 6.6 oz.

Load impedance: 10k ohm min.
Distortion: less than 2% at 1kHz, 0.5-volt
Microphone: Electret condenser, omni directional becoming slightly directional
with increase in audio frequency

Below is a chart of that shows standards for how much sound level is acceptable for a given period:

Sound Level (dB) (A Weighting-slow response): Maximum hrs./day:
90dB- 8hrs
92dB- 6hrs
95dB- 4hrs
97dB- 3hrs
100dB- 2hrs
102dB- 1.5hrs
105dB- 1hr
110dB- .5hr
115dB < 15 mins.

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