North American High Voltage ILC


a. The North American High Voltage Inter-Laboratory Comparison (ILC) is intended to
demonstrate that participating labs agree, within their claimed uncertainties, with the
reference value of the standard.
b. The artifact, a resistive high voltage divider, will be measured by each participant
according to the participant's existing measurement protocol. The results will be
analyzed and published.
c. The protocol is designed, as much as is feasible, to protect the anonymity of the
participants, both during the ILC and in the report.


a. The ILC goal is to verify, and if possible improve, participants’ confidence in high
voltage measurement. As such, it is intended to serve as a Proficiency Test (PT), as
required by ISO17025 and other quality system standards.
b. Participants include private, utility, defense and commercial measurement providers,
across a wide geographic area.
c. A comparison of measurements will allow participants to identify any outlying results
and to implement appropriate corrective actions.
d. A comparison of participants' specific test procedures will allow participants an
evaluation of variations.
e. A comparison of participants' uncertainty budgets will provide verification or an
opportunity to improve participants' claimed uncertainties.
f. Wider dissemination of measurement assurance at high voltage will improve this field
of measurement.