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ad7190
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The ultra low noise 24-bit ADC: AD7190
Test measurements on a strain gauge load cell
The laodcell was connected with a 6-wire configuration to the evaluation board of the AD7190.
The samplerate was set to 10 S/s, chopping enabled (continuous offset and gain correction).
The analog 5V supply was powered from the RIGOL DP832, which has a very low noise level.
We measured an astonishing low noise level of about 50nV(rms).
Spectrum at 600 S/s
Noise level with shorted inputs
Spectrum with connected loud speaker
Spectrum when singing a "Uuuuu..."
Here we evaluated the possibility to use a loudspeaker as a low-frequency microphone. Due to lack of shielding of electromagnetic fields, the coil picks up a huge amount of signals, which are not related to acoustic sound waves.
Arduino Firmware for Arduino DUE
ad7190.1453974370.txt.gz · Zuletzt geändert: 2016/01/28 10:46 von karl
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