Reference
High-Low Setup. The oscilloscope determines the 10%, 5 0%, or
90% levels of the waveform and then uses them to calculate the
measurements. There are two possible methods: H istogram or Min-max.
Auto Select allows the o scill oscope to determine the method used.
Histogram sets the values statistically; it finds the most common
value either above or below the midpoint (dependin g on whether
it is defining the hig h or low reference lev el). Since this statistical
approach ignores sh ort-term aberrations (overshoot, ringing, noise),
histogram is the best method for measuring digital waveforms and
pulses.
Min-max u ses the highest and low e st values of the w aveform
record. This method is best for m easuring waveforms that have
no large, flat portions at a common value, such as sine waves and
triangle waves.
Auto Select chooses one of the above methods automatically
depending on the signal characteristics. Auto Select chooses the
histogram method if the histogram contains prominent peaks. If
not, Auto Select chooses the min-max method.
Measurement Gating. You can use the gating feature to limit
measurements to the portion of the waveform that is on t he screen or
between the cur
sors.
When you turn Screen gating on, the oscilloscope only uses the
waveform poin
ts on screen in its measurements. This function is useful
at the fastest time base settings or when you want to take measurements
on a magnified waveform (w hen zoom
is on).
When you turn Cursor gating on, the oscilloscope displays vertical bar
cursors. Use the general purpose knob and Select button to place the
cursors ar
ound the area of interest.
In the next example, th e cursors surround the second positive-goin g
pulse so t
he oscilloscope can measure the width of that pulse.
98 TDS3000C Series Oscilloscope User Manual
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