Acquiring and Displaying Waveforms
3–64
TDS 500D, TDS 600B, & TDS 700D User Manual
Accumulation Depth determines the length of counters in the waveform array
that record the number of times acquisition signals occur at a display pixel. DPO,
Mask Counting, and Histogram modes use the counters. In DPO mode, the
accumulated numbers and the intensity controls determine the gray-scale
information for each displayed pixel.
To set the accumulation depth, do the following steps:
1. Press DISPLAY ➞ Settings (main) ➞ Display (pop-up) ➞ Mode (main) ➞
DPO (pop-up) ➞ Accumulate (main).
2. Select between Shallow and Deep in the side menu. (Shallow is the default
setting.)
Selecting shallow allows the image to saturate faster. Shallow sets the accumula-
tion depth to 21 bits or, if histograms or mask counting is active, 32 bits. Deep
sets the accumulation depth to 64 bits. Accumulation depths greater than 21 bits
reduce the screen update rate, disable Variable Persistence and No Persistence,
and enable Save/Recall of the Image Array.
The oscilloscope displays DPO waveforms in one of three formats: YT, XY, or
XYZ. To set the display axis format:
Press DISPLAY ➞ Settings (main) ➞ Display (pop-up) ➞ Mode (main) ➞
DPO (pop-up) ➞ Format/RO (main) ➞ XY, YT, or XYZ (side).
YT is the conventional oscilloscope display format. It shows a signal voltage (the
vertical axis) as it varies over time (the horizontal axis).
XY format compares the voltage levels of two waveform records point by point
(see Figure 3–31). That is, the oscilloscope displays a graph of the voltage of one
waveform record against the voltage of another waveform record. This mode is
particularly useful for studying phase relationships. XY format is not triggered.
When you set the VERTICAL POSITION and Vertical Offset to center the
display in YT mode, the XY display is at center screen, and each division of
display in YT mode produces a division of display in XY mode.
When you choose the XY format, any channel or reference displayed is assigned
to the axis indicated in Table 3–5 and displayed as part of an XY pair. If only one
source in an XY pair is displayed, the oscilloscope automatically turns on the
other source to complete the XY pair. Moreover, once XY is on, selecting either
source in a pair turns the pair on; pressing WAVEFORM OFF for either source in
the pair removes both sources from the display.
If in DPO and XY or XYZ, masks and histograms are allowed.
To Set the Accumulation
Depth
Select the Format
To Next Page
Loading...
Need help?
General
