Using/attaching the sensors provided
21
The external TEV sensor is specifically used for the comparative measurement with the
internal TEV sensor (see page 36). Accordingly, it must be placed parallel to the internal
sensor during the measurement on the object chosen for the comparative measurement
(e.g. on an adjacent cubicle).
WARNING
Danger of fatal injury due to electric shock
Before an HFCT sensor is attached, it is imperative that the five safety
rules are followed:
1. Disconnect the power
2. Secure against reconnection
3. Check for presence of voltage
4. Make earth connection and short-circuit
5. Cover or block access to adjacent components which are live
The HFCT sensor is suitable for inductive decoupling of PD pulses directly on cable
ends. To do this, the magnetically closing sensor must be installed on the ground wire
connected to a cable end.
In principle, the PD Scan can also be used in combination with other HFCT couplers, as
long as they feature an accessible BNC interface. However, depending on the sensor
used, this may result in differences in the level display. The PD Scan has been precisely
harmonised with the HFCT sensor in terms of its measurement accuracy.
External TEV sensor
(C900-PD)
HFCT sensor (HFCT)