AC/DC standards Laboratory

OBJECTIVES AND TASKS
The AC/DC standards Laboratory of KEBS is responsible for the maintenance of national standards for voltage, current, resistance, capacitance and inductance and dissemination of the units by means of calibration. The laboratory is also responsible for establishing the degree of equivalence of its national standards with national standards of other National Metrology Institutes (NMIs) by participating in international comparison programs. The accuracies of national standards are transferred to the secondary and working standards by means of calibration.

MEASUREMENT CAPABILITIES

The DC voltage, AC voltage, DC current, AC current, Capacitance, DC resistance and Inductance measurements can be performed at the AC/DC Standards Laboratory.  The capabilities for the given measurements are as follows:

• DC voltage; 10 mV - 1000V
• AC voltage; 1 mV   - 1000V (50 Hz – 1 kHz)
• DC current; 1 mA - 100 A
• AC current; 1 mA -  20A (40Hz)
• DC resistance; 10 mΩ -1MΩ
• Capacitance; 1pF - 99999mF (10Hz-100kHz)
• Inductance; 100mH - 99999H   (10Hz-100kHz)

Within these capabilities, the laboratory provides measurement and calibration services as follows:

• DC voltage standards; (IV, 1,018V, 1,019V, 10V)
• DC voltage source; (0-1000 V)
• AC voltages sources; (0-1000 V)
• Calibrators
• Multimeters
• Ammeters                                             -           Power supplies
• Voltmeters                                             -           TDS meters
• Current sources                                                 -           Inductance meters
• Potentiometers                                       -           Capacitance meters       
• Ohmmeters                                           -           DC voltage dividers
• Resistance boxes                                               -           Current shunts
• pH meters                                             -           Aircraft fuel gauges
• Conductivity meters                                -           AC bridges
• Resistance bridges                                 -           CapacitorsThe national standard, secondary level standards and working standards with their best uncertainties are given;

1,018 V Transvolt standard cells Enclosure in conjunction with Fluke model 731B voltage standard.

The calibration of DC voltage standards and DC voltage function of the 7,5 digit multi-meter are performed by standard cell enclosure model 9154D and Fluke model 731B.

Measurement Quantity	Device under Calibration	Expanded Relative Uncertainty	Confidence level
1,018V	Std cell, DC voltage std, 7,5 digital multi-meter	2.10E-6	95%
1V	DC voltage std	4.10E-6	95%
10V	DC voltage std	6.10E-6	95%
100V, 1000V	DC voltage std	6.10E-6	95%

DKD ACCREDITATION
AC/DC standards laboratory is an accredited laboratory accredited by the Accreditation Body of the DKD of Germany. Accreditation is based on ISO/IEC 17025

Scope of the Accreditation

The calibration laboratory is entitled to issue DKD calibration certificates for the following measurands and to indicate the values shown in the following as smallest uncertainties of measurement.