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When a transient record is being displayed, the software will generate a seconds per

division status indication in its traditional place. This number is not adjustable. While the

oscilloscope mode is designed to compress or expand samples on the screen to reach a specific

time gradicule, the transient recorder mode strictly presents 25 samples per division. It is

intended to be crystal clear what the pure sample data looks like when graphed at one vertical

axis point to one horizontal axis point. Therefore, the seconds per division value will only

change based on the sample rate of the transient record.

An additional time point is displayed on the status bar along with the seconds per

division. This is the absolute time at which the trigger event for the currently displayed segment

occurred with respect to the first trigger event, based on a microsecond counter in the TR122.

The display of the first trigger event will always show zero microseconds (0uS) in this location.

Of course, the timer could lapse during a transient record and thereby provide strange results, but

it is good for over an hour – an eternity in the world of transient recording.

To move the display between segments use the << and >> buttons on either side of the

sample memory profiler. This action will set the display to show the trigger location of the new

segment at the center of the gradicule. To move the trigger location and explore the reaches of

the memory segment before or after the trigger, use the same mouse screen control or the < and >

buttons as in the oscilloscope mode display. The Time At Midscreen display under the HORIZ

tab will represent the time at the middle of the display gradicule with respect to the trigger event

in the currently displayed segment.

2.3.2 Saving A Transient Record

The sample data in a transient record can be saved in one of three formats. The current

displayed image can be saved as a bitmap as in the oscilloscope mode, or the data can be saved

in binary or comma separated text format. A bitmap image may be useful for a brief report about

a recorded signal. The binary format would typically be used by some form of custom post

processing software. The text form is somewhat human readable or it may be used for

processing in spreadsheets or other standard post processing software.

Saving a bitmap image follows the same procedure discussed for the oscilloscope mode.

Saving data is completed using the Save Data item under the File menu. This item is only

available in transient recorder mode. It will also only work if there is a valid transient record

to save. Otherwise it will report an error. A standard file save dialog box will appear with the

file type selectable as binary or text in the Save As Type selection box of the dialog.

DDC TR122 User Manual

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