8
20mV/div to 10V/div. In the right side of the menu, coupling option can be adjusted as AC or DC. OFF
position should be selected to avoid appearing signal on the screen. In a similar way, the settings can be
made via the menu numbered (15) for the Channel-2.
Figure 5. Setting menu for Channel 1
The buttons on the left side of channel setting buttons (11 and 14), provides channel selecting. The
required signal via channel tuning can be resituated by sweeping upright on the screen. The selected
channel's info is seen in (13) (the selection in the Figure 3a is for Channel-1).
3.4.
Horizontal Sensitivity Setting
The horizontal sensitivity setting is what matches up to time setting. Adjusting this should be done
smoothly to observe variety of signals in different frequency levels. For the signals that have unrecognized
frequency, the horizontal sensitivity should be increased from the minimum level until the signal turns into
observable state. The vertical sensitivity may be different for the both channels; however, the horizontal
sensitivity corresponding to time is always same.
The horizontal sensitivity can be arranged ranging from 10 ns/div to 5s/div value. As it seen in the Figure 3a,
this tuning can be performed from the menu numbered (16).
Between 10ns/div - 200ns/div time intervals, Equivalent-time sampling mode works. ETS constructs a
picture of the input signal by accumulating the samples over many wave cycles. Because ETS samples the
waveform over a number of cycles, it can only be used to measure signals that are repetitive. ETS cannot be
used for single-shot or non-repetitive signals
–
for these signals, you need a scope with a sufficiently high
real-time sampling rate.
Note
: When a signal that changes over time is acquired in equivalent-time, the display has sharp vertical
lines indicating the modulation in the signal. This particular type of distortion can easily look like noise to
the user.
