Pulse-injection troubleshooting tool: Identify the instrument used in digital troubleshooting that generates a short-duration logic pulse when manually triggered (often by a pushbutton).

Introduction / Context:
When chasing faults in digital circuits, technicians often need to inject known, controlled pulses into a node to observe downstream behavior. This helps isolate a failing gate, trace signal flow, and verify that subsequent stages respond correctly.

Given Data / Assumptions:

• The tool should deliver clean, short-duration logic-level pulses.
• It must be manually triggered for step-by-step testing.
• It interfaces safely with standard logic voltage levels (for example, 5 V TTL/CMOS, or 3.3 V devices as appropriate).

Concept / Approach:
A logic pulser is designed specifically for this role. It injects a brief HIGH or LOW pulse at the probe tip, allowing the user to see the effect on LEDs, logic probes, or oscilloscope traces. Other named items in the options are either jokes or unrelated components, not suitable for logic testing.

Step-by-Step Solution:

Verification / Alternative check:
Common toolkits for digital troubleshooting include a logic probe, logic pulser, and often a pulse generator or pattern generator for more advanced testing.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing a bench pulse generator (more complex instrument) with a handheld logic pulser; applying pulses at unsafe voltage levels without checking the circuit family.

Final Answer:
logic pulser