Acquiring and Displaying Waveforms
3–50
TDS 500B, TDS 600B, & TDS 700A User Manual
2. Press Frame Length or Frame Count (side) and use the general purpose
knob to enter FastFrame parameters.
Frame Length refers to the number of samples in each acquisition.
Frame count refers to the number of acquisitions to store in the acquisition
memory of the channel. The oscilloscope will set the record length to a value
greater than or equal to the product of the frame count and the frame length.
If the product exceeds the maximum available record length, the oscilloscope
will reduce the frame length or frame count in size such that the product will
fit the record length.
3. Press Horiz Pos (main), then Frame (side), and use the general purpose
knob to enter the number of a specific frame to view. After you press Enter,
that frame should appear on the display.
If you shift the waveform right or left with the front-panel HORIZONTAL
POSITION knob, the window next to the side-menu Frame button will indicate
the frame number of the waveform at the center of the screen.
FastFrame Operating Characteristics. Consider the following operating character-
istics when using FastFrame:
Envelope, Average, and Hi Res form the envelope or average following the
last frame of the concatenated record. For example, if Average or Hi Res
acquisition modes are selected and the frame count is 10, segments 1 through
10 will show Sample or Hi Res frames, and frame 11 will show the average
of frames 1 through 10. If there is not room for one additional frame, the
envelope or average of the frames replaces the display of the last acquired
frame. Average and envelope counts have no affect in FastFrame.
You can press RUN/STOP to terminate a FastFrame sequence. If any frames
were acquired, they are displayed. If no frames were acquired, the previous
FastFrame waveform is displayed.
Because FastFrame waveforms contain many triggers, trigger position
indicators are removed from both the waveform and the record view when
the selected channel, reference, or math waveform is a FastFrame waveform.
In Equivalent Time, the oscilloscope ignores FastFrame mode.
Because FastFrame introduces additional processing time into the operation
cycle of acquire, process, and display, its best to use Single Sequence
Acquisition (see Acquire menu, Stop After menu). With Single Sequence
selected, you will see the current acquisition sequence; otherwise, the display
lags the current sequence by one sequence. You can also see the current
sequence by pressing the RUN/STOP button to stop the acquisition.
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