Datasheet
51
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 Vertical Scale and Horizontal Scale knobs to set up a proper vertical and
horizontal ranges for the signal to be observed.
(3) Push the Acquire button to display the right menu.
(4) In the right menu, select Acqu Mode as Peak Detect.
(5) Push the Trigger Menu button to display the right menu.
(6) In the right menu, select Type as Single.
(7) In the right menu, select Single as Edge.
(8) In the right menu, select Source as CH1.
(9) In the right menu, press Next Page, select Coupling as DC.
(10) In the right menu, select Slope as (rising).
(11) Turn the Trigger Level knob and adjust the trigger level to the roughly 50% of the signal
to be measured.
(12) Check the Trigger State Indicator on the top of the screen, if it is not Ready, push down
the Run/Stop button and start acquiring, wait for trigger to happen. If a signal reaches to
the set trigger level, one sampling will be made and then displayed in the screen. By using
this approach, a random pulse can be captured easily. For instance, if we want to find a
burst burr of high amplitude, set the trigger level to a slightly higher value of the average
signal level, push the Run/Stop button and wait a trigger. Once there is a burr occurring,
the instrument will trigger automatically and record the waveform during the period around
the trigger time. By turning the Horizontal Position knob in the horizontal control area in
the panel, you can change the horizontal triggering position to obtain the negative delay,
making an easy observation of the waveform before the burr occurs (see Figure 0-3).