Table of Contents
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Block Diagrams
Audio Analyzer Section
Audio Analyzer Section
Input Level Control
Switchable gain amplifiers on the Audio Analyzer 1 and Audio
Analyzer 2
assemblies keep the audio input signal within a range suitable for the
detectors.
AC and DC Level Measurements
Detected voltages from the Peak+, Peak − , and RMS detectors are
measured on the Measurement assembly. The Controller calculates the
displayed value taking into account the detector selected from the front
panel, the gain of the amplifiers, and the source of the input signal
(demodulators, front panel).
Distortion and SINAD Measurements
Distortion and SINAD can be measured on 300 Hz to 10 kHz audio
signals. The Controller calculates distortion and SINAD by comparing
the ratio of the voltage after the variable notch filter to the ratio of the
voltage before the notch filter.
Oscilloscope Functions
The Test Set has no specialized oscilloscope assemblies. The and Audio
Analyzer assemblies, Measurement assembly
and the Controller
the oscilloscope functions.
The audio or dc signal to be displayed goes from the Audio Analyzer 2
assembly to a sampler on the Measurement assembly (the same
sampler used by the Spectrum Analyzer). The Controller calculates the
display level by taking the value of the measured signal at each point of
the sweep, the gain of the signal path in the Audio Analyzer assemblies,
and the volts-per-division setting.
The oscilloscope's trigger signals from the side-panel connector, the
Signaling Source and Analyzer assembly
the internal trigger signal are used by the Measurement assembly and
the Controller to determine when to start the scope sweep. The
Controller adds the pre-triggering time entered from the front panel.
266
S:\agilent\e8285\ALR\Book\chapters\blockdiag.fm
(figure 8-11 on page
(figure 8-27 on page
267, and
figure 8-12 on page
(figure 8-13 on page
289) work together to perform
(figure 8-19 on page
268)
269),
277), and
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Table of Contents
Troubleshooting
