
To use roll mode
Roll mode continuously moves data across the display from right to left. Roll
mode allows you to see dynamic changes on low frequency signals, such as
when you adjust a potentiometer. Two frequently used applications of roll
mode are transducer monitoring and power supply testing.
1
Press Mode . Then press the Auto Lvl , Auto, or Normal softkey.
2 Press Main/Delayed .
3 Press the Roll softkey.
The oscilloscope is now untriggered and runs continuously. Also notice that
the time reference softkey selection changes to center and right.
4
Press Mode . Then press the Single softkey.
In Single, the oscilloscope fills either 1/2 of the display if Cntr is selected for
the time reference, or 9/10 of the display if Rght is selected for the time
reference, then it searches for a trigger. As soon as a trigger is found, the
display is filled from the reference point (Cntr or Rght) to the right edge of the
display. The oscilloscope then stops acquiring data.
You can also make automatic measurements in the roll mode. If time
measurements are made while the data is rolling, slight errors are incurred
(less than 2%.) The most accurate time measurements are made on rolled
data when the acquisition is stopped.
Roll mode operating hints
• Math functions, averaging, and peak detect are not available in roll mode.
• Holdoff and horizontal delay are not active in roll mode.
• Both a free running (nontriggered) display and a triggered display (available in
the single mode only) are available in roll mode.
• Roll mode is available at sweep speeds of 200 ms/div and slower for the
54615B and 54616B. Roll mode is available at sweep speeds of
500 ms/div and slower for the 54616C.
The Oscilloscope at a Glance
To use roll mode
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