Basic Operation
QC1936 Digital Storage Oscilloscope 25
trigger within a certain amount of time based on the SEC/DIV
setting. The oscilloscope goes into the scan mode at 80ms/div
or slower time base settings.
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.
AC
DC
HF Reject
LF Reject
Select the components of the trigger signal applied to the trigger
circuitry.
AC: Blocks DC components and attenuates signals below
10Hz.
DC: Passes all components of the signal.
HF Reject: Attenuates the high-frequency components above
80kHz.
LF Reject: Blocks DC components and attenuates the
low-frequency components below 8kHz.
NOTE: Trigger coupling only affects the signal passed through the trigger system. It does
not affect the bandwidth or coupling of the signal displayed on the screen.
Video Trigger
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.
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 knob to specify a
line number.
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.
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