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The analog offset is typically adjusted as part of the vertical controls of an oscilloscope,

known generally as vertical position. With a transient recorder it is more typical to discuss

offset. The term offset will be used in the context of the TR122. The offset allows a DC value

to be added to the input signal, typically to bring a signal with a DC offset within range of the

instrument; but also to allow for separation of multiple signals on a display, such as would be a

typical use of an oscilloscope vertical position control. Within TR122 software the offset is

controlled directly on the screen with the mouse. The arrow icons at the left of the screen

indicate where the offset is for each channel by color. Move the mouse cursor to the left most

horizontal division of the oscilloscope screen and click the left mouse button to move the offset

for the nearest channel to the screen position of the mouse. Holding the left mouse button and

moving the mouse will drag the location of the offset. The position of the icon represents the

display location of a zero volt DC signal input. The data behind the value, such as that stored to

disk, will include the DC offset.

2.2.2 Horizontal Settings

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

display the horizontal settings controls as shown in Figure 2.3 below. In oscilloscope mode the

horizontal Sec/Div control is the only enabled control. This control is similar to the control of

the same name on an oscilloscope. The setting can also be adjusted by clicking on the status line

copy of this value located below the oscilloscope screen.

Figure 2.3 TR122 Control Panel Horizontal Controls

DDC TR122 User Manual

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