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S:\Hp8960\E1960A GSM Mobile Test Application\A.04 Release\Reference_Manual\Chapters\meas_aaud_desc.fm
Analog Audio Measurement Description
Analog Audio Measurement Description
February 14, 2000
How is an analog audio measurement made?
Analog audio measurement response is measured from the mobile station’s audio output, which also may be
an acoustic coupler or electrical connection from the mobile station connected to the test set’s AUDIO IN
connector.
The expected voltage is the absolute peak audio input signal voltage at the front panel BNC. The expected
voltage sets the analog audio clipping level and must be set. The expected voltage is peak voltage and the
results are returned as rms, so a 1-volt rms input signal would need a 1.414 V
peak
expected voltage value.
The trigger source for analog audio is always set to Immediate.
The test set has a tunable bandpass filter with a 100 Hz bandwidth that can be used to tune out ambient noise
for making 217 Hz buzz or 8 kHz whine tests. The filter’s range is from 200 Hz to 8.0 kHz.
The analog audio measurement returns the following measurement results:
• Audio Measurement Integrity Indicator
• Audio Measurement Result (0 V
rms
to +20 V
rms
)
• Audio Multi-measurement Maximum (0 V
rms
to +20 V
rms
) when multi-measurement count is on.
• Audio Multi-measurement Minimum (0 V
rms
to +20 V
rms
) when multi-measurement count is on.
• Audio Multi-measurement Standard Deviation (0 V to +14.14214 V) when multi-measurement count is on.
None of the analog audio measurement results are affected by amplitude offset.
When making an audio measurement on a single port you should terminate the other audio port with either a
50 ohm load or a short. This improves the accuracy of the measurement by reducing sensitivity to stray signals
at the unused port.
If noise is making your audio measurement difficult, use the 100 Hz bandwidth tunable band pass filter. This
narrow band filter reduces the noise significantly. Refer to
“SETup:AAUDio:FILTer[:SFRequency]” on page
.
Trigger Source
Analog audio measurements are triggered immediately after being armed. Arming is not necessary if the
trigger state is set to continuous.
Related Topics
*******************************************************
“Programming an Analog Audio Measurement” on page 45
“Test Adherence to Standards” on page 110
*******************************************************
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