Huron & SNAP Documentation

Testing Signal to Noise Ratios
↓ To test the signal to noise ratio
of Inputs and Outputs
1. Select Sine.
2. Type a Frequency for the Sine wave.
3. Type an Amplitude for the Sine wave.
4. Enter a sum multiplier.
5. Click Gen Output to generate the output signal.
6. Click RunTest to start the test and output the results.
The results will be displayed in the following format.
OTHER TOOLS
Report Result
Sine Signal Level in dB should be equivalent to input
Sine Frequency In Hz should be equivalent to input
Signal to Noise ratio + Distortion In dB should be approximately 80dB
DC offset In dB should be approximately -66.00dB (however this can
vary widely).
Testing I/O’s for Deviation from Normal Frequency Characteristics
↓ To test deviation in the
frequency characteristics of
input and output modules
1. Select White Noise.
2. Type an amplitude.
3. Select a Simfile to output the white noise to if required.
4. Click Gen Output to generate the output signal.
5. Click RunTest to run the test.
The results will be displayed in the following format:
Hz dB Deviation Hz dB Deviation
23.44 35.16
58.59 128.91
246.09 503.91
996.09 2003.91
3996.09 8003.91
15996.09 20003.91
The value for the deviation should be less than (.5 dB.), if it is
significantly higher than this then one of the modules may be
faulty.
HURON TECHNICAL MANUAL PAGE 287