Monitor Audio ASW100 User Manual download pdf (Page 150)

Audio Analyzer

4-38

AM700 Audio Measurement Set User Manual

Acquired audio samples can be processed through one of several standard filters

before the measurements are made. Measurements are then made on the filter output

and those results are plotted or displayed in the real time measurement readouts.

Sweep detection and data settling features assist in defining when acquired data will

be accepted and plotted. These features are discussed beginning on page 4-61.

Measurement modes available are XY mode and Regulation mode. XY mode has

two options for operation, open-loop and closed-loop. In open-loop operation, XY

measurements are made independently of the source of the applied signals. Either

the audio generator of the AM700 or an external generator can be used to provide

test signals to the device being tested by the analyzer in open-loop operation. When

operating in closed-loop, the internal generator of the AM700 supplies the test

signal, normally a sweep signal. As the sweep progresses in closed-loop, the

Analyzer tells the generator when to step to the next point in the sweep.

Regulation mode is also closed-loop operation. In Regulation mode, the Analyzer

has more control than just telling the generator when to step. It drives the generator

to obtain specific output, for example a certain level of harmonic distortion, from

the device under test. Both of these modes are discussed in the following text.

NOTE. The requirements of Regulation mode and closed-loop XY mode measure-

ments are such that they should not be made at the same time.

XY Measurement Mode

Measurement mode is selected in the General Controls section of the Configure

Measurements display (accessed when you press the Configure button and touch the

Measurement Setup soft key). See Figure 4-15. In this mode, the Audio Analyzer

assembles settled data points into a trace that is displayed either graphically or in a

table, depending on how you configure the display.

Axis Assignment. The display X-axis (the independent variable) can be either a

frequency or a level, and its source can be Channel 1, Channel 2, or the output of

one of the generators.

The display Y-axis (the dependent variable) can be one of the following: frequency,

level, THD, THD+N, IMD, phase difference, separation, crosstalk plus noise, or

1 2 ... 145 146 147 148 149 150 151 152 153 154 155 ... 317 318

No comments

Monitor Audio ASW100 User Manual Page 150