13. Hands-On Learning Exercises
Connector knowledge is built by doing. Each exercise produces a deliverable that demonstrates real competence.
Use How to Search for Connectors as a starting point for Exercise 2 and Exercise 3 so your search terms and filters are deliberate before you start comparing families or decoding real parts.
Exercise 1 — Rugged control box connector set
Scenario: Design the external connector interface for a small sealed enclosure: 24 VDC input, Ethernet, CAN, four sensors, one motor output, one debug/service port.
Deliverable: connector family selection table, pinout, cable list, backshell/cap list, and a justification column for every decision.
Related guide pages: Selection Workflow · Decision Paths · Rugged Control Box example · Selection Checklist
Exercise 2 — Connector comparison matrix
Scenario: Compare 38999 Series III, 26482, M12 A-coded, M12 X-coded, D-sub, Micro-D, an industrial rectangular/Han-style connector, and Molex Micro-Fit across: environment, pin count, current, sealing, tooling, cost, lead time, serviceability, common mistakes.
Deliverable: a scored comparison matrix plus a recommendation paragraph for a stated application.
Related guide pages: Standards and Families · Comparison Matrix template
Exercise 3 — Decode three real 38999 part numbers
Scenario: Pull three real manufacturer part numbers and decode series, shell style, service class, shell size, insert arrangement, contact gender, keying, termination, and compatible backshell. Verify against the catalog.
Deliverable: a decoded part-number table (all fields resolved) + a short BOM for one complete assembly.
Related guide pages: MIL-DTL-38999 Deep Dive
Exercise 4 — Design a pinout
Scenario: 12-pin rugged connector: 24 V, return, CAN-H, CAN-L, shield, two discrete inputs, two discrete outputs, one analog input, spares. Keep noisy lines away from analog, assign the shield intentionally, define source/load direction, mark every spare as RESERVED.
Deliverable: a pinout table with a rationale section on power/signal separation and contact-size choices.
Related guide pages: Selection Workflow §2 · Connector Anatomy
Exercise 5 — Select backshell and strain relief
Scenario: For your Exercise 4 connector as a 38999 plug: choose straight vs. 90°, shielded vs. unshielded, environmental backshell, cable OD range, shield termination method, and boot/strain relief.
Deliverable: a backshell selection table with entry angle, cable OD, shield method, material, part number, and source.
Related guide pages: Connector Anatomy · MIL-DTL-38999 §7.1
Exercise 6 — Create a cable drawing
Scenario: Using your pinout: connector A, connector B, wire gauge, wire color, shield/drain treatment, twisted pairs, cable jacket, pinout, labels, length tolerance, notes, test requirements.
Deliverable: an actual cable drawing (hand sketch or CAD), formatted like a real engineering drawing.
Related guide pages: Cable Drawing template · Connector Anatomy
Exercise 7 — Write an ICD entry
Scenario: For one external interface: connector P/N, mating connector, mechanical location, pinout, electrical limits, shielding, mating-cycle expectation, environmental assumptions, cable requirements, torque, dust-cap P/N, assembly notes.
Deliverable: a one-page ICD section formatted to engineering document standards.
Related guide pages: Connector ICD template · Practical Checklist
Exercise 8 — Connector risk review on a real design
Scenario: Take any design you can access. Apply the Section 10 checklist to every external connector; flag every Section 11 red flag.
Deliverable: a connector risk table — connector, risk, severity (H/M/L), recommended corrective action.
Related guide pages: Practical Checklist · Red Flags · Design Review Checklist