Output Noise
I use a Class 1
Bruel & Kjaer 2250-L G4 sound analyzer with a Type 4955a microphone that features a weighted dynamic range of below 6 dBA and up to 110 dBA. All tests are conducted inside a hemi-anechoic chamber at 25–28 °C ambient, and the test subject is placed a meter from the sound analyzer.
Output Noise Comparison Graphs
The following graphs show the output noise of the DS420j and compare it to that of other units I have tested in the past.