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Measuring Waveforms

3- 148

CSA7000B Series & TDS7000B Series Instruments User Manual

Overview Related control elements and resourcesTo take automatic measurements (Cont.)

Set

measurement

reference

levels (Cont.)

18. To select how the instrument determines the base and

top of the waveform, touch Min-Max, Histogram, or

Histogram mean.

H Min-max. Uses the highest and lowest values of the

waveform record. This setting is best for examining

waveforms that have no large, flat portions at a

common value, such as sine waves and triangle

waves — almost any waveform except for pulses.

See Figure 3--36 on page 3--143.

H Histogram. Selects the most common values above

or below the midpoint. Since this approach ignores

short term aberrations (overshoot, ringing, and so

on), Histogram is the best setting for examining

pulses. See Figure 3--36 on page 3--143.

H Histogram mean. Calculates the mean value using

all values either above or below the midpoint

(depending on whether it is defining the high or low

reference level). Histogram mean is best for

examining eye patterns and optical signals.

19. To select the reference level units, touch Units Absolute

or Percent age.

H Absolute. Sets the units to absolute values in user

units.

H Percentage. Sets the units as a percentage of the

High/Low range.

20. To set the reference levels, touch HighRef, Mid Ref, Low

Ref, or Mid2 Ref, and use the multipurpose knobs or

keypad to set the levels.

Tektronix CSA7404B User Manual

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