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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_ts_afan.fm
AFANalyzer Troubleshooting
AFANalyzer Troubleshooting
Possible Setup Issues
During remote operation of the Audio Analyzer, you should always set the Trigger Arm 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 all Audio Analyzer setup parameters to their proper settings for the
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, use the 100 Hz BW BPF filter to reduce the affects of noise (see “Audio Level
Measurement Description” on page 43).
For accurate Audio Frequency measurements where more than one signal may be present, use the 100 Hz BW
BPF filter to isolate the desired signal (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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