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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_ts_swaudio.fm
Swept Audio Measurement Troubleshooting
Swept Audio Measurement Troubleshooting
Possible Setup Issues
During remote operation of the Swept Audio measurement, you should always set the Trigger Arm setting to
Single. The length of time required to return a measurement over GPIB using continuous triggering varies,
but is always longer than when using single triggering. Continuous triggering can also cause problems when
the INITiate:DONE? query is used.
If digital measurements are active, turn them off or set their trigger source to Immediate. See “Triggering of
Measurements” on page 218.
The Detector Type selected (peak or rms) also sets how Audio Level measurements are displayed; as a peak
value or an rms value. When comparing returned values over GPIB to your specifications, be sure to take into
account the type of detector being used.
The Expected Peak Voltage is always set in V
peak
, regardless of the Detector Type selected, and cannot exceed
20 V
peak
(14.1 V
rms
).
For accurate measurements, always set the Detector Type, Filter Type, and other audio analyzer settings for
the type of measurement being made. The SINAD and Distortion measurements typically use different
settings than the Audio Level measurement. See “Audio Analyzer Measurement Description” on page 38 and
“Audio Analyzer Block Diagram” on page 41.
For very low level audio signals, or for measurements made in a noisy environment, use the 100 Hz BW BPF
filter to reduce the affects of noise (see “Audio Level Measurement Description” on page 43).
Interpreting Integrity Indicator Values
See “Integrity Indicator” on page 222.
If over range (5) is returned, the input level is greater than 4.9 dB above the Expected Peak Amplitude value
or the maximum input level of 20 volts peak.
If under range (6) is returned, the input level is lower than 8 dB below the Expected Peak Amplitude value.
If the signal has both over range and under range conditions, only the over range condition (5) is indicated.
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