UKAS ISO17025:2017 Calibration Accreditation (Power)
In 2013, Newtons4th UK was awarded Calibration Laboratory Accreditation by UKAS to ISO17025:2017 for Voltage, Current, Power, Phase, Harmonics and Flicker. Our incentive to achieve this accreditation was a commitment to the highest level of metrology in our field of activity and the desire to provide accredited calibration certificate with every new power analyzer we ship. This is a first in our industry and gives users of N4L power analyzers a higher level of standard calibration than any other power analyzer manufacturer. A great amount of time and engineering effort has also been spent on implementing a sophisticated IEC61000-3-2, IEC61000-3-3, IEC61000-3-11 and IEC61000-3-12 harmonics and flicker calibration facility. This additional certification is also accredited, making N4L the first power analyzer manufacturer to offer power analyzer products with accredited certification to presently defined measurement criteria for IEC61000 Harmonic and Flicker standards.
Our schedule of accreditation is available to view on the UKAS website via this link
|UKAS (ISO17025) Schedule of Accreditation|
|Signal Amplitude||Frequency Range|
|Voltage Sine Amplitude||1V to 1008V||16Hz to 850Hz|
|Voltage Harmonic Amplitude||0V to 302V||16Hz to 6kHz|
|Current Sinewave Amplitude||100mA to 48A||16Hz to 850Hz|
|Current Harmonic Amplitude||0A to 15A||16Hz to 6kHz
|Current to Voltage Phase Angle||-180° to +180°||16Hz to 850Hz|
|Apparent Power (VA Product)||100mVA to 48.4kVA||16Hz to 850Hz|
|AC Power (Reference Source)||0W to 48.4kW||16Hz to 850Hz|
|AC Power (Calorimetry) (New for 2017)||1W to 5W||45Hz to 2MHz|
|Calibration of Impedance Networks (per IEC61000)||33mOhm to 400Ohm||45Hz to 850Hz|
|Current Harmonic Amplitude to IEC61000-4-7||0A to 6A||16Hz to 6kHz|
|Flicker to IEC61000-4-15||Pinst (Sinusoidal Modulation)||As Per IEC61000|
|Pinst (Rectangular Modulation)|
|Distorted Voltage with Multiple Zero Crossings|
|Harmonics with Sidebands|
|Rectangular Changes with Duty Cycle|
N4L Calibration Philosophy
N4L products combine market leading accuracy with exceptional stability so that users can be confident in the long term integrity of measurements. While we recommend re-calibration every 12 months, stability over time and a conservative approach to our product specification allows our products to remain within specification for much longer periods of time. This is proven by many N4L customers who, working in accordance with their own ISO9001 certification, are able to select 24 month calibration periods for N4L products they own.
Alongside our UKAS ISO:17025 accreditation which provides voltage, current, phase and power calibration up to 850Hz plus calorimetric power to 2MHz, we have developed a proprietary high frequency multi channel signal generator named the ACC-IV (Automatic Calibration Controller 4). Combined with custom designed amplifiers, the ACC-IV provides high frequency voltage and current sources at a higher signal level than commercially available calibrators and provides N4L with the means to calibrate our power analyzers over a wider frequency range than any other company.
The term “calibration” is commonly used in relation to measurement instrumentation and yet is surprisingly misunderstood.
Common mistakes in understanding range from the belief that a unit will be more accurate after calibration when in fact most conventional calibrations don’t change the accuracy at all, or that any ISO17025 ‘accredited’ calibration will give a greater assurance of accuracy than an ISO17025 ‘traceable’ calibration, which is often not true.
Since N4L offer a wide range of calibration options including ISO17025 accredited calibration with a broader schedule of accreditation than most power metrology laboratories, we can consider the options impartially.
In the document linked to below, we summarize fundamental elements of calibration and the benefit to a user of measurement optimization during any calibration.
The exceptional detail and accuracy of our calibration is achieved by unique calibration hardware, combined with processes that come from an absolute commitment to best metrology practice. This includes standard calibration with over 200 calibration points at different levels and frequencies to the adjustment points we use for measurement optimization, therefore ensuring linearity of the instrument under test and also the integrity of calibration. An investment in 10 fully automated test systems allows N4L to provide this highest level of calibration with each and every power analyzer we supply.
Every power analyzer is supplied from new with two calibration certificates
1. ISO17025 UKAS accredited calibration for Voltage, Current, Phase, Power (including low power for EN50564 and Energy Star) and PF up to 850 Hz.
|ACCIV Standard Calibration (Utilizing UKAS traceable instrumentation)|
|Signal Amplitude||Frequency Range|
|Voltage Amplitude ||+/-250uVpk to +/-400Vpk DC to 100kHz|
Linearly reducing to +/-10Vpk 100kHz to 2MHz
|DC to 2MHz|
|Current Amplitude||+/-1mApk to +/-5Apk DC to 100kHz|
+/-300mApk to 100kHz to 2MHz
|DC to 2MHz|
Our comprehensive calibration procedure is unrivaled in our sector* and we are confident that our power analyzers offer the highest wide bandwidth performance in the market.
*according to N4L research 2014
Technical Note 003 – Closed Loop Calorimetry PDF, 2,418kb
ISO 9000 Certificate (valid till 2023) PDF, 240kb
UKAS (ISO17025) Certificate of Accreditation PDF, 643kb
Schedule of Accreditation link: https://www.ukas.com/wp-content/uploads/schedule_uploads/00001/7949Calibration%20Single.pdf
N4L Calibration Traceability Ladder link: N4L 17025 Calibration Traceability 2017 PDF, 492kb