Test equipment modes: On which instrument would you typically find a mode selector labeled “train” and “single” for generating multiple or single pulses?

Introduction / Context:
Digital troubleshooting often employs a small set of handheld tools. Knowing which tool provides which function speeds fault isolation. The terms “train” and “single” refer to generating either a burst (train) of pulses or a one-shot (single) stimulus applied to a node in a digital circuit.

Given Data / Assumptions:

• The goal is to inject known logic transitions into a circuit.
• “Single” means one controlled pulse; “train” means repetitive pulses.
• The instrument connects to a digital node and delivers TTL/CMOS-compatible levels.
• The context is board-level troubleshooting, not measurement-only instruments.

Concept / Approach:
A logic pulser is specifically designed to drive logic-level pulses into a circuit to check response paths, clock in data, or step counters. Its modes commonly include single-pulse output and pulse-train output. A logic probe, by contrast, is primarily a sensing device indicating HIGH/LOW/pulse presence, not a stimulus source. Multimeters measure voltage/current/resistance and do not generate logic pulse trains. Current tracers locate current flow along PCB traces; they also are not pulse generators.

Step-by-Step Solution:

Verification / Alternative check:
Check typical handheld logic pulser datasheets/user guides: features include pulse width selection, repetition rate, and “single”/“burst” (train) modes for stimulating logic circuits.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing a logic pulser with a logic probe because both are handheld and used together; assuming a DMM with a frequency function can generate pulse trains—it cannot at logic levels suitable for digital IC stimulation.

Final Answer:
logic pulser