How to test a DMX splitter
A typical certification / commissioning test sequence for consumer electronics usually includes the following:


Usage tests


Functional test (test each function / mode)
Performance test (test how the device performs under maximum load)

Power supply tests


Power supply variations (test with minimum / maximum voltage)
Power supply failure (test where the power is repeatedly lost and restored)
Conducted transients (test reaction to bursts / surges)
Conducted interference (test reaction to high-frequency noise and base frequency harmonics)

Environment tests


Temperature (cold / heat)
Humidity / moisture (e.g. damp heat / water mist / condensation)
Vibrations / shocks (test after a fall)
Inclinations (test the device upside down etc.)
Physical integrity (test if the case can withstand a certain weight or pressure)

Safety tests


Insulation resistance (test at different temperature, humidity levels etc)
High voltage (test if the insulation withstands a certain voltage)
Flammability (typically a destructive test, skip)

Electrical interference tests


ESD (apply electrostatic discharge to exposed connectors)
Low-frequency EM fields (stronger magnetic fields, capacitive coupling)
Radiated interference (test in presence of high-frequency EM fields)

Electrical compliance tests


Conducted emissions (disturbance on power lines)
Radiated emissions