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. 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.
Exercise 2 — Connector comparison matrix. 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.
Exercise 3 — Decode three real 38999 part numbers. 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.
Exercise 4 — Design a pinout. 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.
Exercise 5 — Select backshell and strain relief. 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.
Exercise 6 — Create a cable drawing. 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.
Exercise 7 — Write an ICD entry. 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.
Exercise 8 — Connector risk review on a real design. 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.