Using the Menus

There are two vector cursor displays: POLAR and MARK. (The VECTOR PHASE bezel control continues to adjust the phase of the signal.)

Polar Cursors can be used to measure the amplitude and phase of the chrominance signal. When POLAR is selected, position the cursor (cross hairs) with the AMPLITUDE and PHASE bezel controls, and view the amplitude and phase readouts at the top of the screen. See Figure 3-2. The cursor zero amplitude point is the center point of the graticule. Using the amplitude control to move the cursor out from the center increases the amplitude. Adjusting the cursor phase will rotate the cursor around the center point, with the zero phase point being the B-Y (U) axis. The amplitude readout can be set for mV or IRE values through the CONFIG menu, described on page 3-18.

When the gain or position of the signal is changed, the polar cursors maintain their relationship with the signal.

When CLEAR MENU is pressed, the POLAR / MARK choice on the right side of the screen will be removed, but the bezel controls will still be active and cursor measurements can still be made. When another menu is selected, the bezel controls may be reassigned to the new menu, but will return to cursor control when the new menu is deselected.

Markers can be used to highlight graticule points. When MARK is selected, two additional menu readouts appear. These allow selection of from one to eight markers, and assign the AMPLITUDE and PHASE bezel controls to one of these markers. Markers are designed to be used for reference points; there is no quantitative readout. Markers are positioned with respect to the graticule and are not moved or re- sized with the signal.

When CLEAR MENU is pressed, all of the marker readout except the boxes will be removed. The readout will be restored when CURSOR menu is selected again. When CURSOR menu is exited and re-entered, the selected cursor quantity and position will be retained. One use of markers is to position them on the vector target boxes. Adjust the signal source until the color bar signal appears in the marker boxes.

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1740A/1750A Series Waveform/Vector Monitor User Manual