A relay’s contacts can be damaged by kickback currents. Inductive current is generated when the current in inductive loads is suddenly interrupted. This generates a collapsing magnetic field that induces a potential and is kicked back to the source. This can cause arcing on relay contacts when it opens. Contacts can form carbon deposits or weld together after a while of operation. A relay test set helps in testing relays if they are still in good condition.
The ISA T-1000 features 3 generators which are the main, auxiliary AC and auxiliary DC generators. All of the outputs can be monitored simultaneously through its large back-lit LCD screen. It can operate in automatic or semi-automatic mode. It also has a RS232 and USB port so you can connect it to a computer. This allows you to transfer results and control it with a computer. It has an overload alarm and thermal protection system for enhanced testing safety.
If you have a limited budget for electrical test equipment, you can rent instead of purchasing.