Tutorial
TDS 684A, TDS 744A, & TDS 784A User Manual 2–21
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Figure 2–15: Four Simultaneous Measurement Readouts
By default, the measurement system will use the 10% and 90% levels of the
waveform for taking the rise time measurement. You can change these values to
other percentages or change them to absolute voltage levels.
To examine the current values, press Reference Levels (main) ➞ High Ref
(side).
The General Purpose Knob. The general purpose knob, the large knob, is now set
to adjust the high reference level (Figure 2–16.)
There are several important things to observe on the screen:
The knob icon appears at the top of the screen. The knob icon indicates that
the general purpose knob has just been set to adjust a parameter.
The upper right corner of the screen shows the readout High Ref: 90%.
The High Ref side menu item is highlighted, and a box appears around the
90% readout in the High Ref menu item. The box indicates that the general
purpose knob is currently set to adjust that parameter.
Turn the general purpose knob left and right, and then use it to adjust the high
level to 80%. That sets the high measurement reference to 80%.
Change the MeasurementReference Levels