UME

Impedance Laboratory

About Us

DC and low frequency impedance measurements are performed in the Impedance Laboratories.

impedance img 5 1

Fields of Activity and Services

Impedance Laboratories are divided into two divisions, namely: the DC Resistance Laboratory and the Capacitance Laboratory. The services provided by these laboratories and their work areas can be summarized as follows:

DC Resistance Laboratory

The traceability of AC resistance measurements is obtained by means of calculable AC resistors whose DC values are traceable to the Quantum Hall Resistance Standard. AC resistance measurements are usually used for calibrations of RLC meters. These measurements are performed in the range between 10 Ω and 2 MΩ at TÜBİTAK UME.

DC resistance measurements can be performed between 100 µΩ and 100 TΩ. DC resistance measurements between 1 GΩ and 100 TΩ are performed using a TÜBİTAK UME made Wheatstone Bridge, while measurements up to 1 GΩ are performed using commercially available measurement bridges. Low current measurements down to 2 pA can also be performed using high value resistors. Studies to extend the scope of the low current measurements below 2 pA are being carried out.

impedance img 3

Capacitance Laboratory

The traceability of AC resistance measurements is obtained by means of calculable AC resistors whose DC values are traceable to the Quantum Hall Resistance Standard. AC resistance measurements are usually used for calibrations of RLC meters. These measurements are performed in the range between 10 Ω and 2 MΩ at TÜBİTAK UME.

The traceability of capacitance measurements are obtained via Fused-Silica capacitors that are calibrated by the BIPM. Two commercial bridges, AH2500A and AH2700A are used for the capacitance calibrations up to 1 µF. Capacitance calibrations between 1 µF and 1 mF are performed using a TÜBİTAK UME made capacitance measurement bridge. Capacitance measurement frequency is up to 30 MHz for Agilent 16380 type capacitors.

The traceability of inductance measurements is obtained from capacitance and AC resistance units using a Maxwell-Wien Bridge established at the laboratory. While the inductance measurement range is 100 µH - 10 H, inductance measurements of the order of nH can be performed thanks to recent developments in the laboratory.

AC voltage ratio measurements are generally used for inductive voltage dividers and strain gauge indicators/calibrators. The traceability of AC voltage ratio measurements are provided by a TÜBİTAK UME-made primary level inductive voltage divider calibration system.

In addition to calibration services, device and standard manufacturing services are also provided in the Impedance Laboratories. Devices and standards such as DC resistance standards, current shunts, capacitance standards and inductive voltage dividers can be manufactured in the laboratory.

impedance img 1

Services Provided

.cls-1 { fill-rule: evenodd; stroke-width: 0px; }

Calibration / Testing Services

.cls-1 { fill-rule: evenodd; stroke-width: 0px; }

Training Services

.cls-1 { fill-rule: evenodd; stroke-width: 0px; }

Device Manufacturing Services

.cls-1 { fill-rule: evenodd; stroke-width: 0px; }

Consultancy Services

Technical Hardware and Equipment

Laboratuvarımız 23 ± 1 °C sıcaklık %45 ± 15 bağıl nem değerlerine sahiptir.

PHYSICS GROUP

Projects and Collaborations

  • 1 fA - 100 pA DC Current Source (2013-2014)
  • Manufacturing Inductive Voltage Dividers for Swiss Metrology Institute (2013)
  • FP7 EMRP Project, Automated Impedance Metrology Extending The Quantum Toolbox For Electricity (2013-2016)

Laboratory Images

For more informationContact Us

Email: ume@tubitak.gov.tr

Phone: 0 (262) 679 5000