Measurement Traceability

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.

1. Direct Current, High Voltage and Magnetism Measurement
   DC Voltage
   DC Resistance
   DC Current
   DC High Voltage
   Magnetism
2. Low Frequency Electrical Measurement
   AC Voltage
   AC Current
   Power and Energy
   Capacitance
   Inductance
   AC Voltage Ratio
   Phase and Power Factor
   LCR Meter
   Withstanding Voltage Tester
   AC High Voltage
   Distortion
   Digital Multimeter
   Harmonics
   Flicker
   Octave Filter
3. Radio Frequency Electrical Measurement
   Time and Frequency
   RF Power and Voltage
   RF Attenuation
   RF Impedance
4. Acoustics Measurement
   Laboratory Standard Microphone
   Working Microphone
   Sound Calibrator
   Sound Level Meter
   Audiometer
   Measuring Amplifier
   Microphone Preamplifier
   Type 1 ear simulator
   Audio network analyzer
   Type 3.2 ear simulator
   Personal sound exposure meter
5. Temperature Measurement
6. Humidity Measurement
7. Dimensional Metrology
   Laser Frequency
   Length
   Flatness
   Angle
   Squareness
   Roundness
   Surface Texture
8. Mass and Related Metrology
   Mass
   Volume
   Density
   Pressure
   Torque
   Hardness
   Rotational Speed
9. Force Measurement
   Using Deadweight Force Standard Machine
   Using Hydraulic Force Standard Machine