Chapter 3 Horizontal System Settings; Horizontal Scale; Roll Mode - UNI-T UPO2000E Series User Manual

Chapter 3 Horizontal System Settings

3.1 Horizontal scale

Horizontal scale, also the horizontal time base, is the time value represented by each scale in the horizontal direction,
which is usually expressed as s/div. With the SCALE knob in the horizontal control area, user can adjust the horizontal
scale in 1 – 2 – 5 steps, i.e. 5ns/div, 10ns/div, 20ns/div, 50ns/div......50s/div. Turn clockwise to decrease the scale and
turn counterclockwise to increase, the scale information on the upper left corner of the screen (as shown below) changes
in real time.
When changing the horizontal time base, the waveform will expand or compress according to the trigger point position.

3.2 ROLL mode

When the trigger mode is auto, adjust SCALE knob in the horizontal control area to change the horizontal scale to be
slower than 50ms/div, and the oscilloscope will be in ROLL mode and will continuously plot the waveform voltage-time
trend chart on the screen. The earliest waveform first appears on the right end of the screen, and then gradually moves
to the left, as shown below:
Use the slow sweep mode to observe low frequency signal, and setting "channel coupling" method to "DC" is recommended.
Note: "Horizontal displacement", "extended window", "protocol decoding", "pass/fail", "parameter measurement",
"waveform recording" and "independent time base" are not available in ROLL mode.
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