![]() 20 seconds would be enough time to build from -138.5 dB (all 0’s in a 24-bit integer) to 0 dBFS (all 1’s), given a 0 dBFS reference tone.ĥ. Turn on your calibrator and wait a moment for the average to stabilize - say 10-15 seconds for a microphone calibration using an SLC, maybe 20 to be on the safe side. Select the audio device and input channel that you want to calibrate.ģ. Open the Amplitude Calibration dialog window by clicking CalibrateSound Level Options button in the dialog (Options > SPL/LEQ…).Ģ. ![]() Re: SPL –measurement does not what it shouldġ. Fortunately, Rational Acoustic’s “Calvert Dayton” has already provided instruction on how to go through the process via a post on the Rational Acoustics forum. My AMPROBE SM-CAL1 Sound Meter Calibrator just arrived and I thought I would figure out how to setup an accurate SPL meter in Smaart 7.
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