Measurement setups Set up measurement gating
Low reference
The Low Reference defines the low reference level of a waveform; the default level is 10%. This
reference level is used with the High Reference level in the calculation of rise and fall times. To
change this level, click the control and then, set the level with the multipurpose knob.
Mid2 reference
The Mid2 reference defines the middle reference used on the second waveform specified in delay or
phase mea surements; the default level is 50%. To change this level, click the control, and then set
the level with the multipurpose knob.
Set up measurement gating
From the Measure menu, highlight Gating; then select Gating from the submenu or click the Gating
button in the Measurement Setup window.
Overview
Use the Gating control window to limit the measurement area of the waveform to the region bounded by
the vertical bar cursors or to the left and right edges of a Zoom window.
To use
To define the gating area with the vertical bar cursors, click Cursor, and then click either Indep or
Tracking to select the Track Mode. These buttons are only displayed when you click Cursor.
To define the gating area from a Zoom area, click one of the four Zoom buttons.
To turn off measurement gating, click the Off button.
Click Setup to return to the Measurement control window.
Behavior
Normally the instrument takes measurements over the entire waveform record. Gating lets you limit
measurements to a specific portion of the waveform. You can limit gating to the region bounded by the
vertical bar cursors or to the left and right edges of a Zoom area.
When you click Zoom (1–4) the Zoom window appears in the lower half of the display. Measurements are
taken within the boundaries of the Zoom area. You can only take measurements on one Zoom area at a time.
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 289
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