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S:\Hp8960\E1962B CDMA 2000\Pi Release\Reference Guide\Chapters\cdma2000_meas_afan_desc.fm
Audio Analyzer Measurement Description
Expected Peak Voltage
The Expected Amplitude sets the analog audio clipping level and must be set. This voltage is always the
absolute peak audio input signal voltage expected at the AUDIO IN connectors, and must be in the range of
7.07 mV
peak
(5 mV
rms
) to 20 V
peak
. Remember, measuring a 1-volt rms sinewave input signal would require a
1.414 V
peak
expected voltage value to avoid clipping (over-driving) the input.
De-Emphasis State
Set to On or Off (default) to enable or disable 750 microsecond de-emphasis.
Expandor Reference Level
Set value from 10 mV/kHz to 10 V/kHz, or Off (default). Entering a numeric value automatically turns the
state to On. Entering Off disables the expandor (state = off).
Trigger Source
Audio Analyzer measurements use immediate triggering and are continuously re-triggered by the analyzer
any time the Trigger Arm parameter is set to Continuous. Trigger timing is independent of any mobile
protocol signaling.
Considerations When Making Manual Audio Analyzer Measurements
When manually controlling the test set from the front panel, all measurements default to using continuous
triggering. If you make digital measurements on a DTC using RF Rise or Protocol triggering, and then hand
off to an AVC and select an analog measurement, the analog measurement may not trigger and display a
result. This is because the digital measurement is still waiting for a burst transmission to trigger it (which it
won’t get from an analog signal) and therefore the measurements “freeze”. To prevent this from happening
when making analog measurements, either turn off the digital measurements or set their trigger source to
Immediate.
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