Final answer:
After a regulator adjustment, a leak test followed by an operational test should be conducted to ensure the regulator's proper functioning and safety.
Step-by-step explanation:
Upon completion of a regulator adjustment, you should always follow-up with a leak test. This test is crucial for ensuring that the regulator is functioning properly and there are no gas leaks, which can be hazardous. The procedure typically involves applying a soapy water solution to the joints and connections of the regulator and observing for bubbles that would indicate a leak. In addition to the leak test, it is important to perform an operational test to confirm that the regulator is controlling pressure as intended. Proper follow-up testing ensures safety and functionality of the equipment after any adjustment.