ADInstruments DS2002A Series User Manual page 33

Options
Trigger Type
Edge Video
Pulse Slope
Swap Overtime
Source
Mode
Coupling
N O O O O T T T T E E E E : : : : T T T T r r r r i i i i g g g g g g g g e e e e r r r r c c c c o o o o u u u u p p p p l l l l i i i i n n n n g g g g o o o o n n n n l l l l y y y y a a a a f f f f f f f f e e e e c c c c t t t t s s s s t t t t h h h h e e e e s s s s i i i i g g g g n n n n a a a a l l l l p p p p a a a a s s s s s s s s e e e e d d d d t t t t h h h h r r r r o o o o u u u u g g g g h h h h t t t t h h h h e e e e t t t t r r r r i i i i g g g g g g g g e e e e r r r r s s s s y y y y s s s s t t t t e e e e m m m m . . . . I I I I t t t t d d d d o o o o e e e e s s s s
n o o o o t t t t a a a a f f f f f f f f e e e e c c c c t t t t t t t t h h h h e e e e b b b b a a a a n n n n d d d d w w w w i i i i d d d d t t t t h h h h o o o o r r r r c c c c o o o o u u u u p p p p l l l l i i i i n n n n g g g g o o o o f f f f t t t t h h h h e e e e s s s s i i i i g g g g n n n n a a a a l l l l d d d d i i i i s s s s p p p p l l l l a a a a y y y y e e e e d d d d o o o o n n n n t t t t h h h h e e e e s s s s c c c c r r r r e e e e e e e e n n n n . . . .
Video Trigger
Options Settings
Video
CH1
CH2
Source
EXT
EXT/5
Normal
Polarity
Inverted
All Lines
Line Number
Sync
Odd Field
Even Field
All Fields
NTSC
Standard
PAL/SECAM
DS2002A Series Digital Storage Oscilloscope User Manual
Settings Comments
By default the oscilloscope uses the edge trigger which
triggers the oscilloscope on the rising or falling edge of the
input signal when it crosses the trigger level (threshold).
Select the input source as the trigger signal.
CH1, CH2: No matter the waveform is displayed or not, a
CH1
certain channel will be triggered.
CH2 EXT: Does not display the trigger signal and allows a trigger
EXT level range of +1.6V to -1.6V.
EXT/5 EXT/5: Same as EXT option, but attenuates the signal by
AC Line
a factor of 5 and allows a trigger level range of +8V to -8V.
AC Line: Uses a signal derived from the power cord as the
trigger source.
Select a trigger mode.
By default, the oscilloscope uses the Auto mode. In this
mode, the oscilloscope is forced to trigger when it does
not detect a trigger within a certain amount of time based
on the SEC/DIV setting. The oscilloscope goes into the
Auto
scan mode at 80ms/div or slower time base settings.
Normal
In the Normal mode, the oscilloscope updates the display
only when it detects a valid trigger condition. New
waveforms are not displayed until they replace old ones.
Use this mode to just view valid triggered waveforms.
Only after the first trigger does the display appear.
Select the components of the trigger signal applied to the
trigger circuitry.
AC: Blocks DC components and attenuates signals below
AC
10Hz.
DC
DC: Passes all components of the signal.
HF Reject
HF Reject: Attenuates the high-frequency components
LF Reject
above 80kHz.
LF Reject: Blocks DC components and attenuates the
low-frequency components below 8kHz.
Comments
With Video highlighted, an NTSC, PAL or SECAM
standard video signal will be triggered. The trigger
coupling is preset to AC.
Select the input source as the trigger signal. Ext and Ext/5
use the signal applied to the EXT TRIG connector as the
source.
Normal: Triggers on the negative edge of the sync pulse.
Inverted: Triggers on the positive edge of the sync pulse.
Choose a proper video sync. When selecting Line
Number for the Sync option, you may use the User Select
knob to specify a line number.
Choose a video standard for sync and line number
count.
Basic Operation
28