Audio Frequency Measurement Description
Last updated: October 28, 2004
How is an Audio Frequency measurement made?
Audio Frequency measures the frequency of the signal applied to the front-panel AUDIO IN connectors, and is one of the Audio Analyzer measurements. Audio frequency can be measured for signals in the frequency range of 100 Hz to 15 kHz, at levels from 7.1 mV peak to 20V peak, and with a signal-to-noise ratio of 30 dB or greater.
The audio frequency measurement is made after any filtering and processing are selected for the Audio Analyzer.
Considerations When Making Manual Audio Frequency 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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