8
www.tektronix.com/tds3000
TDS3000C Series Oscilloscopes
Debug Digital Logic Problems
Digital designers must troubleshoot logic condi-
tions on digital circuits. They may need to deter-
mine what happens when, or if, two signals meet
a Boolean trigger condition. They may want to
evaluate conditions when two signals become
logically true or false, such as from the output of
a two-input AND, OR, NAND, or NOR logic gate.
When troubleshooting digital logic synchronous
state machines, designers may want to determine
if a state signal is true or false at the time a clock
signal transition is true. The TDS3000C Series’
logic triggers, such as its pattern and state
triggers, can be used to tackle these problems.
To use these logic triggers:
1. In the
Trigger
section, press the
Menu
button.
2. In the bottom menu, press
Type
until
Logic
is selected.
3. In the bottom menu, press
Class
to select either
Pattern
or
State
.
4. Select, as desired,
Inputs
,
Trigger When
,
Thresholds
,
and
Mode & Holdoff
.
5. For pattern triggers, also define whether to trigger on
AND
,
OR
,
NAND
, or
NOR
conditions.
