Analog-Precision Board

Products by Analog-Precision => Ultimate-Preamplifier by Analog-Precision => Performance and Measurements => Topic started by: Tranquility Bass on September 25, 2020, 08:49:17 AM

Title: AES17 - SNR
Post by: Tranquility Bass on September 25, 2020, 08:49:17 AM
Applies to: EUTs with analogue or digital inputs and analogue or digital outputs.

Aim: To measure the output noise of the EUT in the presence of signal.

Method
The EUT is fed with a 997Hz sinusoidal stimulus at an amplitude 60dB below its maximum signal
amplitude (60dBFS).
The output of the EUT is passed through a standard notch filter at the frequency of the stimulus, and
also through the standard weighting filter. The RMS amplitude of the residual is measured for both
channels, in dBFS (in the case of an analogue measurement, this is equivalent to dB below the
specified D/A line-up), and designated as 'dBFS CCIR-RMS'.
See also: Level Search Routines for fault finding with this test.

Conclusion

The DNR for 8 channel differential current mode from the spec sheet for the ES9038PRO is 132 dB-A directly from the DAC output so this measurement is consistent with that measurement if we take into account the additional Noise Figure of both the IV converter and external buffer amplifiers.

References
http://resources.prismsound.com/tm/dS3_Applications_Manual_A4nc.pdf
Title: Re: AES17 - SNR
Post by: Tranquility Bass on September 25, 2020, 08:49:51 AM
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