© THETA Ingenieurbüro GmbH 2015 Microohm Meter The status of an electrical joint is describable with  its the electrical resistance. One of the largest  influences of the status of the joint is the quality of  assembly, that determines the residual lifetime. A  preventive step against bad joints will be taken by  measuring of the electrical resistance of the joint. Infrared Guard The assembly quality of electrical joints declines  with operating time and could cause failures in  electrical installations. The infrared guard is a  online system to detect bad joints to avoid failures  in electrical installations during operation. We have developed an online measuring system,  that guards the joints temperature and gives  information about the status at the same time. If  the joint temperature is reaching a critical region a  status signal is generated according to its  importance.