Jennings operates test facilities to provide all environmental, high voltage, and radio frequency (RF) test parameters. All relays are individually tested prior to shipment for pull-in voltage, drop-out voltage, timing characteristics, contact resistance, and dielectric strength.

Vibration, shock, humidity, salt spray, temperature effects, current load and reliability tests are regularly performed on a sampling basis. Current tests are made at maximum recommended envelope temperatures.

Mechanical life reliability tests are performed with equipment that will detect relays which cycle without proper sequence of contact operation. Some relay types have been checked to more than 108 operations, without defect.