Hantek DSO8072E - Page 40

Basic Operation
DSO8000E Series HandHeld Oscilloscope User Manual 35
Options
Settings
Comments
Video
With Video highlighted, an NTSC, PAL or SECAM
standard video signal will be triggered. The trigger
coupling is preset to AC.
Source
CH1
CH2
EXT/5
Select the input source as the trigger signal. Ext/5 use
the signal applied to the EXT TRIG connector as the
source.
Polarity
Normal
Inverted
Normal: Triggers on the negative edge of the sync
pulse.
Inverted: Triggers on the positive edge of the sync
pulse.
Sync
All Lines
Line Number
Odd Field
Even Field
All Fields
Choose a proper video sync. When selecting Line
Number for the Sync option, you may use the User
Select it to specify a line number.
Standard
NTSC
PAL/SECAM
Choose a video standard for sync and line number
count.
Note: When you choose Normal Polarity, the trigger always occurs on negative-going sync
pulses. If the video signal contains positive-going sync pulses, use the Inverted Polarity
option.
Pulse Width Trigger
You can use it to trigger on aberrant pulses.
Options
Settings
Comments
Pulse
With Pulse highlighted, the trigger occurs on pulses that
meet the trigger condition (defined by the Source, When
and Set Pulse Width options).
Source
CH1
CH2
EXT/5
Select the input source as the trigger signal.
EXT/5: Does not display the trigger signal and allows a
trigger level range of +6V to -6V.
Polarity
Positive, Negative
Mode
Auto
Normal
Single
Select the type of trigger. The Normal mode is best for
most pulse width trigger applications.
Coupling
AC
DC
Noise Reject
HF Reject
LF Reject
Select the components of the trigger signal applied to the
trigger circuit.
When
=
≠
<
>
Select the trigger condition.
Pulse Width
20ns to 10.0sec
With Set Pulse Width highlighted, set the pulse width.
50%
Trigger When: The pulse width of the source must be ≥5ns so that the oscilloscope can detect the
pulse.