DPO6000
，
MPO6000 Series Digital Phosphor Oscilloscope Instruction V1.1
- 36 -
【
50%
】
set the trigger level as the vertical central point of the peak-peak value of the
trigger signal.Trigger level value is displayed on the top right corner.
【
Mode
】
select acquisition mode(auto
、
normal),press V0 to confirm.
【
Holdoff
】
set holdoff time.
Trigger level knob
:analog channel can modify the trigger level value. Trigger symbol
moves up and down according to the rotation of the knob.Rotate the trigger level knob to
acquire the stable trigger.
Digital channel
:can change trigger threshold of the digital channel by setting the threshold
voltage.
6.5.3.Video Trigger
You can use video trigger to acquire most complex waveform of standard analog video
signals and Hd video signals. The trigger circuit can detect the vertical and horizontal
spacing of the waveform and generate a trigger based on the selected video trigger
setting.This series oscilloscopes support NTSC(National Television Stands Committee)
and PAL.
Press
【
Trig Menu
】
on the front panel to enter trigger function menu.
【
Type
】
select video,and press V0 to confirm.
【
Data source
】
select
CH1~CH4
to be trigger source.
【
Standard
】
select the desired video standard.This series oscilloscopes support: NTSC
、
PAL
、
HDTV720p
、
HDTV1080p and HDTV1080i.
【
Synchronization
】
select the video trigger mode(scan line
、
video line
、
odd fields
、
even
fields
、
all fields).
Scan line:trigger on the first line found.
Video line:for NTSC and PAL/SECAM video standards, trigger on the specified line
in the odd or even field.
Note
: When this sync trigger mode is selected, you can modify the line number in
Line
menu with a step of 1. The range of the line number is from 1 to 525 (NTSC), 1 to
625 (PAL), 1 to 750(720P) or 1 to 625 (576P).
Odd fields:trigger on the rising edge of the first ramp pulse in the odd field.
Even fields: trigger on the rising edge of the first ramp pulse in the even field.
All fields:trigger on the rising edge of the first ramp pulse in the odd/even field.
【
Line number
】
rotate V0(PAL 1~625,NTSC 1~525)
、
1 to 750(720P)
、
1 to 1125
(1080P/1080i).
【
polarity
】
select the desired video polarity (positive polarity,negative polarity).
【
Mode
】
select the acquisition mode(auto
、
normal),press V0 to confirm.
【
Holdoff
】
set the holdoff time.
Trigger level knob
:modify the trigger level value. Trigger symbol moves up and down
according to the rotation of the knob.Rotate the trigger level knob to acquire the stable
trigger.
6.5.4.Slope Trigger
In slope trigger, the oscilloscope triggers on the positive or negative slope from one level
to another level in the specified time.
As shown in the figure below,positive(negative) slope time is defined as the time
difference between the two crossing points of trigger level line with the rising(falling) edge.
