All of the measurements except for the multi-tone audio measurement become unavailable when the Voice SO Mode is set to Multi-Tone or Null Frame. This is because many of the DSP resources are consumed for producing the audio signal and running the vocoder so there are not enough left to perform other measurements.
Possible Setup Issues
During remote operation of this measurement, you should always set the Trigger Arm to Single. See
SETup:CMAudio:CONTinuous
. If single triggering is used during manual operation, press the
START SINGLE
key to trigger each measurement.
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.
-
You should select a voice service option (SO1, SO3, SO17, SO68, or SO32768) (see
Service Option
) and set the Voice SO Mode to
Multi-Tone
(see
Voice SO Mode
) to perform the downlink multi-tone audio measurement.
-
You should select a voice service option (such as SO1, SO3, SO17, SO68, or SO32768) (see
Service Option
) and set the voice SO mode to
Null Frames
(see
Voice SO Mode
) to perform the uplink multi-tone audio measurements.
-
See also
Requirements when making a downlink multi-tone audio measurement
and
Requirements when making an uplink multi-tone audio measurement
.
-
The SINAD and Distortion measurements are made on the first audio tone. It is recommended that you set the downlink or uplink audio generator to produce single tone (see
Multi-Tone Audio Generator Parms
) when making the SINAD and Distortion measurements. If multi-tone is selected, all other tones will be measured as noise resulting in bad SINAD and Distortion results.
-
In the SINAD and Distortion measurement if you want to change the service option (SO1, SO3, SO17, SO68, or SO32768), after changing the service option, you should set the
Multi-Tone Audio Total Level
to
0 V
first then reset the value you want. Otherwise so much noise will result in bad SINAD and Distortion results.
During downlink multi-tone audio measurement, if "Over Range" is displayed, it indicates that the measured audio signal at AUDIO IN port is far above the Expected Audio In Peak Voltage setting. You should increase the Expected Audio In Peak Voltage setting. If "Under Range" is displayed, it indicates that the measured audio signal at AUDIO IN port is far below the Expected Audio In Peak Voltage setting. You should decrease the Expected Audio In Peak Voltage setting. You can adjust the Expected Audio In Peak Voltage setting based on the value of Total Meas Audio Level which is shown in the Multi-Tone Audio Information table below the graph display.
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 possible, turn this off while making multi-tone audio measurements.
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