Keysight U8903A User Manual

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Contents

Keysight U8903A User Manual Manual pdf 117 page image

Audio Analyzer Measurement Functions 5Keysight U8903A User’s Guide 117Measurement FunctionsThis section describes the measurement functions.FrequencyFrequency is a common and basic measurement function which is expressed inhertz (Hz). The U8903A uses software algorithm to detect the period of arepetitive waveform and the frequency is computed from the reciprocal of theperiod.To obtain better accuracy and resolution, autoranging should be enabled. For lowfrequency signals, set a longer measurement time to get better and more stablereadings. Input filters can also be activated to remove unwanted high frequencynoise from the measured signal, allowing more stable readings.AC voltage level (Vac)This is the most common measurement function of an AC signal. The U8903Aprovides three types of AC level detection consisting of RMS, Peak-to-Peak, andQuasi Peak. Refer to Chapter 3, “AC level detection” on page 78 for moreinformation. When the RMS detection method is selected, the AC voltagemeasurement is expressed as an RMS value. Likewise, if the Peak-to-Peakdetector is selected, the result is a peak-to-peak value.As an example, for a 1 Vrms sine input signal, the display will show 1 V if the RMSdetector is selected. On the other hand, if the Peak-to-Peak detector is selected,the display will show 2.828 V (1.414 × 2).The Quasi Peak detector is normally used with the CCIR filter per the IEC 60468standard.