Audio Analyzer Measurement Functions 5
U8903A User’s Guide 93
Measurement Functions
This section describes the measurement functions.
Frequency
Frequency is a common and basic measurement function
which is expressed in hertz (Hz). The U8903A uses software
algorithm to detect the period of a repetitive waveform and
the frequency is computed from the reciprocal of the period.
To obtain better accuracy and resolution, autoranging should
be enabled. For low frequency signals, set a longer
measurement time to get better and more stable readings.
Input filters can also be activated to remove unwanted high
frequency noise from the measured signal, allowing more
stable readings.
AC voltage level (Vac)
This is the most common measurement function of an AC
signal. The U8903A provides three types of AC level
detection consisting of RMS, Peak- to- Peak, and Quasi Peak.
Refer to Chapter 3, “AC level detection” on page 58 for more
information. When the RMS detection method is selected, the
AC voltage measurement is expressed as an RMS value.
Likewise, if the Peak- to- Peak detector 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 RMS detector 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 60468 standard.
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