Trigger Setup
Trigger Type Trigger Condit
ions
Logic
Trigger when a
ll channels transition to the specified
state. Use multipurpose knob a to select a channel.
Push the appropriate side-bezel button to set that
channel’s sta
te to High (H), Low (L),orDon’t Care (X).
Use the Cloc k side-bezel button to enable clocked
(state) triggering. You can have at most a single clock
channel. Pus
htheClock Edge lower-bezel button to
change the polarity of the clock edge. Turn off clocked
triggering and return to unclocked (pattern) triggering by
selecting t
he clock channel and setting it to high, low,
or don’t care.
For unclocked triggering, by default, triggering occurs
when the se
lected condition goes true. You can also
select triggering when the condition goes false, or
time-qualified triggering.
You can use
up to 21 channels for a Logic trigger (4
analog, 16 digital, and 1 RF).
NOTE. To use the RF input in a Logic trigger, you must
first inst
all the MDO4TRIG application module.
NOTE. Optimum Logic trigger performance is achieved
by using only analog channels or only digital channels.
Setup and Hold Trigger when a l ogic data input changes state inside of
the setu
p or hold time relative to a clock edge.
Setup is the amount of time that data should be stable
and not change before a clock edge occurs. Hold is the
time th
at data should be stable and not change after a
clock edge occurs.
MDO4000 Series oscilloscopes are capable of multiple
chann
el Setup and Hold triggering, and can m onitor the
state of an entire bus for setup and hold violations. You
can use up to 20 channels for a Setup and Hold trigger
(4 ana
log and 16 digital).
Use the Clock side-bezel button to select the clock
channel. Use the Select control, Data, and Not used
butt
ons to select one or more channels you want to
monitor for setup and hold v iolations.
NOTE. Optimum Setup and Hold trigger performance is
achi
eved by using only analog channels or only digital
channels.
Rise/Fall Time Trigger on rise and fall times. Trigger on pulse edges
that traverse between two thresholds at faster or slower
rat
es than the specified time. Specify pulse edges as
positive or negative or either.
MDO4000 Series Oscilloscopes User Manual 85
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