Example 3: Capturing A Single Signal - Owon TDS7074 User Manual

Gain = Output Signal / Input signal
Gain (db) = 20×log (gain)

Example 3: Capturing a Single Signal

It's quite easy to use Digital Oscilloscope to capture non-periodic signal, such as a
pulse and burr etc. But the common problem is how to set up a trigger if you have no
knowledge of the signal? For example, if the pulse is the logic signal of a TTL level,
the trigger level should be set to 2 volts and the trigger edge be set as the rising edge
trigger. With various functions supported by our Oscilloscope, user can solve this
problem by taking an easy approach. First to run your test using auto trigger to find
out the closest trigger level and trigger type, this helps user to make few small
adjustments to achieve a proper trigger level and mode. Here is how we achieve this.
The operation steps are as follows:
(1) Set the probe menu attenuation coefficient to 10X and that of the switch in the
probe to 10X (see "How to Set the Probe Attenuation Coefficient" on P13).
(2) Adjust the VOLTS/DIV and SEC/DIV knobs to set up a proper vertical and
horizontal ranges for the signal to be observed.
(3) Press the TRIGGER Menu button.
(4) Select Trig Mode in the bottom menu; select Edge in the left menu.
(5) Select Source in the bottom menu; select ① in the left menu.
(6) Select Coupling in the bottom menu; select DC in the right menu.
(7) Select Slope in the bottom menu; switch it to Rising.
(8) Select Mode&HoldOff in the bottom menu; select Single in the right menu.
(9) Adjust the trigger level to the roughly 50% of the signal to be measured, you can
use the TRIG LEVEL knob or the touchscreen (see "Set the Vertical System
7.Demonstration
Figure 7-2 Waveform of Gain Measurement
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