CEM DT-9989, User Manual, Page: 48 / 68

2-12 Display System
•After startup, actual time and date display at the top
left corner on the interface, format: mm/dd/yy,
hh/mm/ss (picture 2-10-1).
•Function of the clock is supplied by the back-up
battery inside of the device, which can work for 5 to
10 years, and irrelevant to the Li-ion rechargeable
battery.
•Take “Operating Instructions For Oscilloscope” for
reference for the adjustment of clock.
•After startup, at the top right corner, display the working
Li-ion rechargeable battery electric power (picture 2-10-2).
•The battery fully charged, 4 cells.
•When 1 cell left, blue color turn to red, warning to
recharge, 30 to 45 minutes may be used by this left
power.
•All cells disappear, please recharge promptly, 15 to
20 minutes may be used by this left power.
The oscilloscope displays forms of voltage relative to time, and helps user measure and display
waveforms. Two ways of measurements can be adopted: Scale measurement or cursor
measurement.
Fast and direct evaluation can be done by this way, for example, waveform amplitude can be
observed to judge whether it’s 0.8V or not.
By calculating relevant primary and secondary scale division, then multiplying by proportion
factor, simple measurement can be taken.
For example, if four main vertical scale divisions between the waveform peak and base are
figured out, proportion factor is 200 mV/division, peak value voltage can be calculated by the
following method: 4 divisions * 200mV/div= 0.8V
As the following picture shows, press “HOLD” or “REC”, “V/Fcursor” appear in prompt bar,
indicates function switch button for cursor measurement.
1. Blue vertical cursor appears on the displayed screen, press “
” to move the cursor, one
time for one space, press this key for more than 1 second for fast move, the cursor moves
continuously in the same direction.
2. Press “MODE” to switch left/right cursor, lighter cursor indicates state of activation.
3. Display mode of frequency and cycle is also switched at the time of left/right cursor switch.
Activate left cursor displays frequency, right cursor for cycle. See picture 2-11-1.
2 12 1 Time and Date
2 12 2 Battery Electric Power Display
2 13 Measuring System
2 13 1 Scale Measurement
2 13 2 Movement of Cursor
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Picture 2-10-1
Picture 2-10-2
48
Oscilloscope Section