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High reference

The High Reference defines the high reference level of a waveform; the default level is 90%. This reference level is used with the

Low 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.

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.

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.

When you click Cursor, measurements are taken within the boundaries of the vertical cursors. Use the multipurpose knobs to

move the cursors.

When you use vertical cursors to control the gating, you can also specify the cursor mode. Use the independent cursor mode to

move the cursors one at a time with the multipurpose knobs. Use the tracking mode to have the cursors track one another;

moving Cursor 1 automatically moves Cursor 2 in tandem.

Measurement setups

290 DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series

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