SINAD Measurement Description
Last updated: January 16, 2009
How is a SINAD measurement made?
SINAD is a receiver audio quality measurement that is typically used for mobile stations operating on an analog system, such as AMPS. It is the ratio of Signal+Noise+Distortion divided by Noise+Distortion, expressed in dB. SINAD is measured using the test set's Audio Analyzer. SINAD can be measured in the range of 100 Hz to 10 kHz. For information on using the Audio Analyzer, see
Audio Analyzer Measurement Description
.
The SINAD measurement is used to determine receiver RF sensitivity. SINAD is usually measured either of two ways:
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Reduce the Cell Power from the test set until 12 dB SINAD is displayed (re-triggering for each measurement), or
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Set the Cell Power from the test set to a specified low level and verify a 12 dB SINAD reading.
Difference in Agilent 8960 Series 10 and 8920B Test Set SINAD Measurements
If you have previously used the Agilent 8920B RF Communications Test Set to measure SINAD, you may notice that the Agilent 8960 Series 10 test set's SINAD value may be lower by up to 0.8 dB when measuring 12 dB SINAD. This is due to the more precise digital notch filter used by the 8960, causing a more accurate noise measurement to be made. The 8920B uses an analog filter that does not have as tight a filter notch as the 8960.
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