The calibrations and measurements made by SCL are metrologically traceable to the International System of Units (SI). SCL has set up primary measurement standards in some of its measurement fields. Primary measurement standards may be primary realisations of the SI units or agreed representations of the SI units based on fundamental physical constants. These primary measurement standards provide the ultimate metrological traceability to the SI for the reference measurement standards and measuring equipment used by SCL in the respective fields. For measurement fields where primary measurement standards have not yet been set up, SCL sends the appropriate reference measurement standards to overseas primary measurement standards laboratories of recognised international repute and authority, such as NPL of UK, NIST of USA, PTB of Germany, for regular recalibration in order to provide traceability to the SI. In a few special cases, reference measurement standards derive metrological traceability through other overseas accredited calibration laboratories.
To ensure that the measurement standards established in SCL are in harmony with those established elsewhere, SCL participates in inter-laboratory comparisons of measurement standards whenever opportunity arises.
Details on metrological traceability of SCL's measurements in various fields are available.
- Direct Current Electrical Measurement
DC Voltage
DC Resistance
DC Current
DC High Voltage - Low Frequency Electrical Measurement
AC Voltage
AC Current
Power
Capacitance
Inductance
AC Voltage Ratio
Phase and Power Factor
LCR Meter
Withstanding Voltage Tester
AC High Voltage - Radio Frequency Electrical Measurement
Time and Frequency
RF Power and Voltage
RF Attenuation
RF Impedance - Acoustics Measurement
Laboratory Standard Microphone
Working Microphone
Sound Calibrator
Sound Level Meter
Octave Filter - Temperature Measurement
- Humidity Measurement
- Dimensional Metrology
Laser Frequency
Length
Flatness
Angle
Squareness
Roundness
Surface Texture - Mass and Related Metrology
Mass
Volume
Density
Pressure
Torque
Hardness - Force Measurement
Using Deadweight Force Standard Machine
Using Hydraulic Force Standard Machine
