DN112-06v02
JYE Tech - 10 - www.jyetech.com
External Trigger
External trigger means using a different signal as trigger signal.
It is useful in situations where you want oscilloscope captures
be synchronized by a specific signal. To use external trigger
you need feed the synchronous signal into the test signal
connector of DSO112A and select “Ext” at trigger setup screen.
Please note that the maximum allowed voltage for external
trigger signal is 0 – 15V.
Trigger Level
Trigger level is a DC level that is used to compare with trigger
signal to detect intersections. It is indicated by a pink triangle at
screen right border. Trigger level can be adjusted by touching
anywhere in the right half screen and scroll vertically. To
produce valid trigger the level needs to fall inside the range
between maximum and minimum signal amplitude.
Adjust Vertical
Position
To adjust vertical position touch anywhere in the left half
screen and scroll vertically.
Adjust Horizontal
Position
To adjust horizontal position touch anywhere of the screen and
scroll horizontally.
Hold State
Capture can be temporarily stopped by putting it in HOLD
state. Once in HOLD state the screen refresh will be stopped
and the last captured waveform will remain on display which
can be view without rush.
To enter HOLD state (i.e. frozen a waveform) touch the
top-right corner of screen where a green “Running” is shown.
Alternatively, press the power button will also enter HOLD
state. In HOLD state the green “Running” will turn into a red
“Stop”.
To exit HOLD state touch the top-right corner (or press power
button) again.
When trigger mode is set to SING HOLD state will be entered
automatically if valid trigger is detected.
Select Record Length
For DSO112A record length can be set to 512 or 1024 points.
To change record length enter “Select Timebase” screen as
stated in “Adjust Timebase” section and use “>>” button to
navigate to the end page. Select wanted record length and touch
“Done” to finish.
Test Signal Output
The test signal of DSO112A is for probe checking and
calibration purpose. It is not a general signal source. The
nominal amplitude of the test signal is 3.3V with 5% tolerance.
The output impedance is 1K ohm. Test signal frequency can
selected from several preset values (see instructions below).
Once external trigger is selected the test signal output will be
disabled automatically. It restores as soon as internal trigger is
chosen.
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