The Voltage Laboratory has measurement capabilities in the areas of DC and AC voltage, DC and AC current. Measurement ranges are 0 V - 1000 V for DC voltage, 2 mV - 1000 V at frequencies of 10 Hz - 1 MHz for AC voltage, 0.1 V - 50 V at 1 MHz - 100 MHz for RF voltage, 1 mA - 1000 A for DC current and 100 µA - 20 A at 10 Hz-100 kHz for AC current.
The realization of the unit of voltage is based on the AC Josephson effect. The Josephson DC Voltage Standard is used to maintain the TÜBİTAK UME group of zener diode based-DC voltage standards. Using these standards, the accuracy of the Josephson voltage is transferred to the working standards of the laboratory and then to customer devices by means of calibration.
Traceability for DC current measurements is established using DC voltage and resistance standards which are traceable to the Josephson and Quantum Hall standards respectively.
AC measurement traceability is provided by comparison to the DC standards using thermal converters. Thermal converters are used in the combination with suitable serial and parallel connected resistors to form standards for AC voltage and current.
The reliability of measurements performed in the laboratory is demonstrated through participation in various international comparisons. Details about the laboratory comparisons and calibration and measurement capabilities (CMCs) can be found in BIPM KCDB database (http://kcdb.bipm.org).
Laboratory facilities including calibration services are operated in accordance with TÜBİTAK UME’s Quality Management System which complies with ISO/IEC 17025 “General requirements for the competence of testing and calibration laboratories”. Voltage Laboratory has been accredited by Turkish Accreditation Agency (TÜRKAK) according to ISO/IEC 17025. The accreditation scope of the laboratory covers a wide range of calibration services.