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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_meas_sinad_desc.fm
SINAD Measurement Description
SINAD Measurement Description
How is a SINAD measurement made?
SINAD is a receiver audio quality measurement for mobiles on an analog voice channel (AVC). 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” on page 38.
The SINAD measurement is used to determine receiver RF sensitivity. SINAD is usually measured either of
two ways:
• Reduce the Cell Power from the test set until 12 dB SINAD is displayed (re-triggering for each
measurement), or
• Set the Cell Power from the test set to a specified low level and verify a
≥12 dB SINAD reading.
See IS-137A, section 2.3.1.1, for more information.
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.
Considerations When Making Manual SINAD Measurements
When manually controlling the test set from the front panel, all measurements default to using continuous
triggering. If you make digital measurements on a DTC using RF Rise or Protocol triggering, and then hand
off to an AVC and select an analog measurement, the analog measurement may not trigger and display a
result. This is because the digital measurement is still waiting for a burst transmission to trigger it (which it
won’t get from an analog signal) and therefore the measurements “freeze”. To prevent this from happening
when making analog measurements, either turn off the digital measurements or set their trigger source to
Immediate.
Related Topics
“Programming a SINAD Measurement” on page 177
“AFANalyzer Troubleshooting” on page 704
“Audio Analyzer Measurement Description” on page 38
“Test Adherence to Standards” on page 76
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