Last updated: December 3, 2008
During remote operation of the multi-tone audio measurements, 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? is used.
The Expected Peak Voltage is always set in V peak and cannot exceed 20 V peak (14.1 V rms ).
For accurate measurements, always set all the multi-tone audio measurement setup parameters to their proper settings for the measurement being made. Uplink, Downlink, and SINAD and Distortion measurements typically use different settings depending on the combination used. See Uplink Measurement Mode and Downlink Measurement Mode .
When using an audio breakout on the mobile station, do not connect both the microphone input and the speaker out to the test set at the same time. This will impact measurement accuracy.
The mobile station's echo canceller implementation can impact measurement results. If possilbe, turn this off while making multi-tone audio measurements.
See Integrity Indicator .
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.