Measurements on the High-Voltage System

Measurements On The High-voltage System

Measurements in the high-voltage area must always be taken using measuring adapters, that have connectors compatible with the Porsche high-voltage system. In addition to the VAS 6558 measuring adapters, an approved voltage detector that meets the requirements of at least overvoltage category CAT III is also required for voltage measurements, as well as a special insulation resistance meter.

NOTE: Refer to the Workshop Data for more information and instructions on taking measurements.










Three different measuring adapters are available for taking different measurements.

Adapter 1 (VAS 6558/1-1)







The DC voltage is measured at the connections on the power electronics or the high-voltage battery to establish whether an electric charge is present after the service disconnector is unplugged and before work is started on the hybrid components. The functional performance of the voltage detector must be tested with a reference voltage (vehicle electrical system voltage) before and after measurements are taken at the measuring points on the measuring adapter. Correct functioning of this adapter and also of the two other measuring adapters must be checked before they are used by means of resistance measurements. Only then can work start on the high-voltage components.

Adapter 2 (VAS 6558/1-2)







Adapter 2 is used to perform insulation measurements on the high-voltage lines and the power electronics. An insulation resistance meter for all-pole insulation measurement is connected to the measuring sockets for this purpose.

Adapter 3 (VAS 6558/1-3)







Adapter 3 is used to measure the insulation of the lines to the air-conditioning compressor and the connections (all poles).

NOTE: Always use measuring and test equipment approved by the manufacturer. Further information can be found in the workshop literature.

Standardisation of measuring devices







The IECEE defines standard international test procedures and certifications for electrical equipment. Adopted standardized test procedures are performed by recognized certification authorities and validated with a globally recognized test certificate. This certificate confirms that a test sample from a product series has been tested successfully. The devices are marked accordingly. IEC test regulation 61010 is valid for high-voltage measurements:

Safety regulations applicable to hand-held accessories for measuring and testing

The VDE (Association of German Electrical Engineers) is a certification authority recognized by the IECEE. Measuring devices marked with the VDE symbol have therefore been tested in accordance with globally valid procedures and are authorized for international use. In some countries, additional requirements must be fulfilled and certified with the national mark of conformity.







Only measuring devices that bear the VDE mark of conformity comply with DIN VDE 0681-1 parts 2 and 4 and IEC 61010 and can therefore be used for taking high-voltage measurements.







Products that comply with directives valid within the EU are marked with the CE symbol (Conformit� Europ�enne). In Europe, no other national marks of conformity are required but are often applied.







The mark of conformity from the USA includes the letters UL (Underwriters Laboratories Inc.).







Canada mark of conformity (Canadian Standards Associations).







In Germany, devices certified by T�V bear additional marks of conformity that guarantee safe handling.