The second part of the Chinese high voltage test technique series deals with the measuring systems used in dielectric testing, and its practical effect in China is to determine whether a test result is accepted at all: because the country operates a substantial number of high voltage laboratories belonging to manufacturers, utilities and third party bodies, the standard provides the common basis on which the performance of a divider, a peak voltmeter or a digital recorder is characterised and its uncertainty stated. It defines the scale factor, linearity, stability and dynamic behaviour that a system must possess, the methods for determining each, the reference systems against which a working system is compared, and the periodic checks and records that must be maintained. Chinese calibration practice follows the document when a laboratory seeks accreditation for dielectric testing, and the uncertainty statement it produces is what a customer examines when a type test report is submitted for approval.