Measuring Waveforms
3–78
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
Figure 3–40: Measure Menu — Gating
To specify how measure determines the High and Low levels of waveforms, do
the following step:
Press MEASURE
➞ High-Low Setup (main) ➞ Histogram or Min-Max
(side). If you select Min-Max, you may also want to define reference levels.
Histogram sets the values statistically. It selects the most common value either
above or below the mid point (depending on whether it is defining the high or
low reference level). Since this statistical approach ignores short term aberrations
(overshoot, ringing, and so forth), histogram is the best setting for
examining pulses.
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 wave and triangle waves—almost any waveform except for
pulses.
To set the reference levels, do the following steps:
1. Press MEASURE
➞ Reference Levels (main) ➞ Set Levels (side) to
choose whether the References are set in % relative to High (100%) and Low
(0%) or set explicitly in the units of the selected waveform (typically volts).
See Figure 3–41. Use the general purpose knob to enter the values.
% is the default selection. It is useful for general purpose applications.
Define High-Low Setup
Define Reference Levels
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