Section 9 | Electrical Standards Section

Overview

Overview


 

The Electrical Standards Section maintains the following Basic Electrical Quantities:

  • Voltage
  • Current
  • Resistance
  • Time/Frequency

DC Voltage

  • maintained from the mean value of a bank of electronic standard cells
  • traceability obtained from NMI’s abroad (typically Australia, Singapore) to an uncertainty of 0.05 to 0.08 ppm
  • cells in the bank are regularly intercompared to monitor stability of individual cells
  • used to calibrate customer standards (typical calibration uncertainty offered to customers: 0.3 ppm to 0.7 ppm
  • calibration process fully automated (using home-grown talent, expertise and technology)

 

Resistance

  • maintained with a set of Standard Resistors (values from 1 mW to 1 MW)
  • traceability obtained from NMI’s abroad (typically Australia, Korea) to an uncertainty < 1 ppm
  • measurements performed in temperature controlled oil bath with a stability and uniformity of ± 0.005°C; resistance measurements very dependent on temperature (typical temperature sensitivity 2 to 8 ppm/°C

 

For calibration of resistance standards from 100 mW to 1 MW resistance range:

  • Direct Current Comparator Bridge
  • Calibration is computer-aided

Calibration and measurement supported by:

  • technical procedures and work instructions
  • Certificate of Calibration
  • ISO 17025 compliant

 

 

International Measurement Intercomparisons


 

Area / Quantity Instrument / Artefact Date Intercomparison details
Ac-dc voltage transfer Fluke 5500A (voltage mode) May-96 Bilateral (NML, Australia now NMIA)
Ac-dc voltage transfer Fluke 540B Thermal Transfer Standard Aug-96 Bilateral (NML, Australia now NMIA)
Dc Resistance Standard resistors Dec-96 Bilateral (LCIE, France)
 (1 W, 10 kW and 1 MW)
Ac-dc current transfer Fluke 540B with external current shunts Apr-97 Bilateral (NML, Australia now NMIA)
Ac-dc current transfer Fluke 5500A (current mode) Aug-97 Bilateral (NML, Australia now NMIA)
Dc Resistance Standard resistors Oct-97 Bilateral (NML, Australia now NMIA)
 (10 W, 100 W, 10 kW and 1 MW)
Ac-dc voltage transfer Fluke 540B Nov-97 APMP
(with 10V & 100V test network)
Dc Resistance Standard resistors Apr-98 Bilateral (NML, Australia now NMIA)
 (1 kW, 10 kW, 100 kW and 1 MW)
RF Power HP 878478 Thermistor mount Feb-00 Bilateral (NML, Australia now NMIA)
Ac-dc voltage transfer Fluke 540B Thermal Transfer Standard May-01 Bilateral (NML, Australia now NMIA)
Ac-dc voltage transfer 3V Single-Junction Thermal Transfer Standard Aug-02 APMP K6
GPS Receiver Delay GPS Receiver Jul-06 APMP

 

Quality System


 

Calibration and measurement work supported by:
  • technical procedures and work instructions
  • Certificate of Calibration ISO 17025 compliant

Traceability

Traceability


Electrical

Services

Measurement Capabilities


 

Table 1.1: Measurement Capabilities A

Calibration or Measurement Service Measurand Level or range Best Measurement Uncertainty
(95% confidence level, k=2)
Quantity Instrument or Artifact Minimum value Maximum value Units value Units
Dc current sources: Dc current sources/calibrators 0.0001 0.0001 A 2.1 mA/A
(0.0001 A to 1 A) 0.001 0.001 A 2.1 mA/A
0.01 0.01 A 11 mA/A
0.1 0.1 A 11 mA/A
1 1 A 11 mA/A
Dc Resistance Standard Resistors 1 1 W 0.31 mW/W
(1 W to 1 MW) Dc current sources/calibrators 10 10 W 0.52 mW/W
Dc current sources: 100 100 W 0.52 mW/W
(0.0001 A to 1 A) 1000 1000 W 0.52 mW/W
10000 10000 W 0.52 mW/W
100000 100000 W 1 mW/W
1000000 1000000 W 1 mW/W
Frequency Oscillator Timebase 10 10 MHz 1 part in 1010

 

 

Table 1.2: Measurement Capabilities B

Calibration or Measurement Service Measurand Level or range Best Measurement Uncertainty
(95% confidence level, k=2)
Quantity Instrument or Artifact Minimum value Maximum value Units value Units
Dc current sources: Dc current sources/calibrators 0.0001 0.0001 A 2.1 mA/A
(0.0001 A to 1 A) 0.001 0.001 A 2.1 mA/A
0.01 0.01 A 11 mA/A
0.1 0.1 A 11 mA/A
1 1 A 11 mA/A
Dc Resistance Standard Resistors 1 1 W 0.31 mW/W
(1 W to 1 MW) Dc current sources/calibrators 10 10 W 0.52 mW/W
Dc current sources: 100 100 W 0.52 mW/W
(0.0001 A to 1 A) 1000 1000 W 0.52 mW/W
10000 10000 W 0.52 mW/W
100000 100000 W 1 mW/W
1000000 1000000 W 1 mW/W
Frequency Oscillator Timebase 10 10 MHz 1 part in 1010

 

Table 1.3: Measurement Capabilities C

Calibration or Measurement Service Measurand Level or range Best Measurement Uncertainty
(95% confidence level, k=2)
Quantity Instrument or Artifact Minimum value Maximum value Units value Units
Dc current sources: Dc current sources/calibrators 0.0001 0.0001 A 2.1 mA/A
(0.0001 A to 1 A) 0.001 0.001 A 2.1 mA/A
0.01 0.01 A 11 mA/A
0.1 0.1 A 11 mA/A
1 1 A 11 mA/A
Dc Resistance Standard Resistors 1 1 W 0.31 mW/W
(1 W to 1 MW) Dc current sources/calibrators 10 10 W 0.52 mW/W
Dc current sources: 100 100 W 0.52 mW/W
(0.0001 A to 1 A) 1000 1000 W 0.52 mW/W
10000 10000 W 0.52 mW/W
100000 100000 W 1 mW/W
1000000 1000000 W 1 mW/W
Frequency Oscillator Timebase 10 10 MHz 1 part in 1010

 

 

Table 1.4: International Measurement Intercomparisons

Area / Quantity Instrument / Artefact Date Intercomparison details
Ac-dc voltage transfer Fluke 5500A (voltage mode) May-96 Bilateral (NML, Australia now NMIA)
Ac-dc voltage transfer Fluke 540B Thermal Transfer Standard Aug-96 Bilateral (NML, Australia now NMIA)
Dc Resistance Standard resistors Dec-96 Bilateral (LCIE, France)
 (1 W, 10 kW and 1 MW)
Ac-dc current transfer Fluke 540B with external current shunts Apr-97 Bilateral (NML, Australia now NMIA)
Ac-dc current transfer Fluke 5500A (current mode) Aug-97 Bilateral (NML, Australia now NMIA)
Dc Resistance Standard resistors Oct-97 Bilateral (NML, Australia now NMIA)
 (10 W, 100 W, 10 kW and 1 MW)
Ac-dc voltage transfer Fluke 540B Nov-97 APMP
(with 10V & 100V test network)
Dc Resistance Standard resistors Apr-98 Bilateral (NML, Australia now NMIA)
 (1 kW, 10 kW, 100 kW and 1 MW)
RF Power HP 878478 Thermistor mount Feb-00 Bilateral (NML, Australia now NMIA)
Ac-dc voltage transfer Fluke 540B Thermal Transfer Standard May-01 Bilateral (NML, Australia now NMIA)
Ac-dc voltage transfer 3V Single-Junction Thermal Transfer Standard Aug-02 APMP K6
GPS Receiver Delay GPS Receiver Jul-06 APMP
Dc Resistance Standard resistor (100 W) Jan-07 Bilateral (NIMT, Thailand)

Accreditation

The Electrical Standards Section of the National Metrology Laboratory of the Philippines is competent under the terms of ISO/IEC 17O25:2OO5 to carry out calibration of electrical standards.

ilac mra dakks

Scope of Accreditation

electrical scope

 Download Accreditation Certificate and Annexes