Tektronix TBS2104B - How to change the measurement password

Roll mode tips
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Push Run/Stop to halt Roll mode.
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Roll mode is disabled under the following conditions:
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When using Reference, Math, or FFT waveforms
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Using the Zoom and Search function
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Taking measurements (Measure menu)
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When trigger mode is changed to Normal
■
When horizontal scale is set to 40 ms/division or higher (for 5 M record
lengths, this is limited to 400 ms/division or higher)
NOTE. The Average acquisition mode is unavailable when you are using Roll
mode.
Acquisition setup
TBS2000B Series Oscilloscopes User Manual 79