The output voltage of this equipment is derived from a high impedance source and is current limited. However, when the equipment is in use, should the operator accidentally contact the test electrode they will receive an electric shock. If this situation is unavoidable we recommend that rubber or plastic insulating gloves be worn. Furthermore, the operator should be in good health and – in particular – not suffer from any cardiac condition.

During testing, a static charge may accumulate on the surface under test. If the operator is walking on the surface, he or she may also become ‘charged-up’. When discharged to earth, this charge could result in a static electric shock, such as may be experienced in the home under certain weather conditions. Whilst such a shock does not normally present any danger to the user, it can be unpleasant. In most cases, the operator can avoid this by wearing the blue ESD wristband supplied and ensuring it is connected by the blue cable to the grounding terminal (4mm socket) on the PHD Pro’s test probe handle, or the earthing point on the instrument case. In all cases it is essential to ensure that the instrument is correctly earthed.