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The horizontal menu includes a status display value in Time At Mid Screen. This box

will display the time represented at the horizontal center line of the gradicule with respect to the

trigger location. The units and resolution will depend on the Sec/Div setting and the magnitude

of the value. This display can be quite useful when the trigger location is not displayed or is

beyond the horizontal bounds of the screen. Because the full size of the memory is quite large,

it is possible to view events substantially on either side of the trigger and know where they are in

time. This feature is available in transient recorder mode as well. For oscilloscope users, this

feature starts to show the strengths of a transient recorder design for certain types of

measurements within the same price/performance class of instrument.

The horizontal location at which the trigger bar is displayed can be adjusted by clicking

and holding the left mouse button on the display and dragging the display in either direction.

The position can also be adjusted in steps with the < and > buttons at the bottoms of the screen.

These controls are similar to the horizontal position control of an oscilloscope.

The horizontal menu in the oscilloscope mode also shows the ghosted values of the

transient recorder settings being used. The memory geometry will be constant in oscilloscope

operation, but the sample rate will change with certain ranges of the Sec/Div setting. This

display can be useful in determining what sample rate setting may be required to perform

transient measurements on a given input.

2.2.3 Trigger Settings

Selecting the TRIG tab in the controls dialog at the left of the oscilloscope screen will

display the trigger settings controls as shown in Figure 2.4 below.

Figure 2.4 TR122 Control Panel Trigger Controls

DDC TR122 User Manual

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