Reference
Bottom Side Description
Ch1, Ch2 (Ch3, Ch4) Sets the pulse width signal source.
Ext
Ext/10
Sets external or external divided by 10 as the signal source.
Ext Probe nn
X Voltage / Current
(4-channel only)
Set this val
ue to match 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 knob
to set the at
tenuation 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 oscilloscope 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 trigger source, from the
lowest-numbered active channel to the highest-numbered active channel.
(See pag
e 96.)
PositivePolarity
Negative
Sets the
source signal pulse polarity on which to trigger.
Pulse W
idth < N
Pulse Width > N
Tr igge
rs the oscilloscope when the s ource signal pulse width is less than
or greater than the specified pulse width N.
Pulse Width = N
Trigge
r When
Pulse
Width ≠ N
Triggers the oscilloscope when the signal pulse width is equal to or not
equal to the specified pulse width N within a ±5% tolerance.
Level N
Sets
the s ignal threshold voltage level to N using the general purpose
knob.
Set to TTL Sets the signal threshold voltage level to 1.4 V.
Set to ECL Sets the signal threshold voltage level to -1.3 V.
Level
Set to 50% Sets the threshold voltage level to 50% of the signal's peak-to-peak value.
Mode & Holdoff The table on Edge triggering includes a description of this menu item.
(See page 94.)
Key Points
Trigger When. The source pulse width must be ≥5 ns in order for the oscilloscope
to detect the pulse.
Runt Pulse Trigger
Runt-pulse triggering triggers the oscilloscope when a signal pulse is less than a
specified threshold level. You c an also specify runt pulse-width parameters. This
trigger is useful for troubleshooting bus-contention problems.
TDS3000C Series Oscilloscope User Manual 103
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