Reference
Bottom Side Description
Ch1, Ch2 (Ch3,
Ch4)
Sets the video signal source.
Ext
Ext/10
Sets external or external divided by 10 as
the signal so
urce.
Ext Probe nn
X
Voltage / C urrent
(4-channel only)
Set this value to m atch the attenuation factor
and the type of probe (voltage or current) that
is attached
to the external trigger connector.
Push the menu button to select the probe
type. Use the general purpose k nob to set
the attenu
ation factor. The default values are
1x and voltage.
AC Line Sets the AC line frequency as the trigger
source. This trigger source is only available
when the o
scilloscope is connected to AC
power.
Source
Vert
Sets the lowest-numbered displayed channel
as the trigger source.
Alternating (all
active
channels)
Sequentially uses each active channel as a
trigge
r source, from the lowest-numbered
active channel to the highest-numbered
active channel. (See page 96.)
Odd
Even
Triggers on odd or even fields in an interlaced
signa
l.
All F
ields
Triggers on any fieldinaninterlacedor
noninterlaced signal.
Trigger On
All Lines Triggers on all lines.
Mode &
Holdoff
The
table on Edge triggering includes a
description of this menu item. (See page 94.)
Key Points
Displaying the Trigger Source. You do not have to display a channel to use it as
a trigger source.
Sync Pulses. When you choose Video, the trigger always occurs on
n
egative-going sync pulses. If your video signal has positive-going sync pulses,
invert the signal using the Vertical menu. (See page 115.)
108 TDS3000C Series Oscilloscope User Manual
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