Tektronix RSA2200A, User Manual

Page: 233 / 354

Trace Comparison Display and Average Function
RSA2203A & RSA2208A User Manual
3- 113
Trace 1/2 Type... Selects the type of processing for the selected trace.
H
Normal. Displays normal waveform without averaging.
H
Average. Averages the selected trace.
H
Max Hold. Holds the maximum value at each data point on the waveform.
H
Min Hold.
Holds the minimum value at each data point on the waveform.
Number Of Averages. Specifies how many traces are accumulated to create the
averaged value. Setting range: 1 to 100000 (default: 20).
Averaging is controlled in two ways as shown in Table 3--12.
Table 3- 12: Averaging method
Data acquisition Average type Number of Averages
Free run
(Continuous mode only)
Exponential
RMS
Continues the average with an exponential
weighting applied to old values using Number of
Averages as the weighting factor.
Triggered and
Single mode
RMS Averages traces accumulating up to Number of
Averages, then stops the acquisition until the next
trigger event occurs.
Reset Average.
Causes trace accumulation to start over.
Display Detection... The bin data is thinned out in the display because the number
of pixels in the horizontal direction of the screen is generally smaller than the
number of bins in the FFT. Display Detection selects the method to be used for
decimating traces to fit the available space. It is related only to the thinning of
displayed data.
H
Max-Min. Draws a line connecting the maximum and the minimum values
of data corresponding to each pixel.
H
Max. Displays the maximum value of data corresponding to each pixel.
H
Min. Displays the minimum value of data corresponding to each pixel.
The analyzer performs RMS detection using the linear A/D converter regardless
of the Display Detection setting.
Refer to page 3--118 for details on compression of waveform display data.