I get decibels in negative

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Qais
Qais on 19 Nov 2014
Commented: Qais on 19 Nov 2014
I am using the attached file to measure decibels, but I keep getting the readings in negative. Is there a way to get positive results? if yes how? and if not then how can I calibrate it??
  2 Comments
Thorsten
Thorsten on 19 Nov 2014
There is no file attached.
Qais
Qais on 19 Nov 2014
yes sorry i forgot to attach it :P

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