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Picture of our UKAS symbol and laboratory number with reference to balance calibration

UKAS Balance Calibration

We can offer UKAS Balance Calibration on all leading manufacturers of laboratory balances and industrial scales.

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Levels of UKAS Balance Calibration

UKAS Service Level: As Found Check + Full Post Adjustment Calibration

  • Perform a 5 point check of the linearity before the equipment is serviced or adjusted. This documents how the balance was performing before it was adjusted/calibrated and is detailed on the certificate.
  • Balance is serviced and adjusted where applicable.
  • Full Post Adjustment Calibration performed testing: Linearity at 10 points, Repeatability and Eccentricity and calculation of the uncertainty of measurement. UKAS certificate Issued.

UKAS Service Level: Full As Found & Full Post Adjustment Calibration

  • Full As Found Calibration performed testing: Linearity at 10 points, Repeatability and  Eccentricity and calculation of the uncertainty of measurement. UKAS certificate issued.
  • Balance is serviced and adjusted where applicable.
  • Full Post Adjustment Calibration performed testing: Linearity at 10 points, Repeatability and Eccentricity and calculation of the uncertainty of measurement. UKAS certificate Issued.

UKAS Service Level: Full As Found Calibration

  • Full As Found Calibration performed testing: Linearity at 10 points, Repeatability and Eccentricity and calculation of the uncertainty of measurement. UKAS certificate Issued.
  • Equipment will not be serviced or adjusted or Post Adjustment calibration performed unless requested by the customer (additional charge applies).

About Your UKAS Balance Calibration Certificate

Certificate of Calibration

This document is issued in accordance with our UKAS accreditation 0438 and consists of at least two pages. Page 1 details the standards used and their classification together with the customer and instrument details, it may as well detail the laboratory environment depending on the type of instrument. Page 2 and further pages will detail the actual calibration data the details of which are detailed below.

Calibration Type

The certificate will be identified (A) ‘As Found‘ or (B) ‘ Post Adjustment‘. We will only use B when we have actually changed the calibration of the equipment. By definition if the instrument is fitted with a calibration adjustment facility then this is classed as a Post Adjustment calibration, customers are advised to activate this before each series of weighings. We would recommend that the customer does a daily check of their artefact immediately before and after the full calibration to establish a history of calibration.

Repeatability Test

This involves at least ten repetitive weighings at between 75 & 100% of the range under test. The values at zero and test point are detailed together with the difference between the readings.

Linearity Test

This test involves at least ten weighings through and to the maximum of the range under test. European Instruments carry out this test after activating any internal calibration adjustment device. The applied load together with indicated value are detailed as is the maximum difference between the two.

Eccentric Loading

This test details the effects of placing a load between 1/4 & 1/3 of the range under test on the load receptor. The load is then moved to the positions as noted in the chart and the largest reading from either centre reading noted.

Uncertainty of Measurement

This is calculated in accordance with an approved formula taking into account the following:

  • The stated uncertainty of the largest weight used.
  • The drift of the weight in 6.1 (usually the same as 6.1).
  • The standard deviation of the readings in 3 above.
  • The readability of the instrument for digital rounding effect.
  • The readability of the instrument for digital rounding at zero.
  • An air buoyancy correction (usually 1 part per million of the range).
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Excellent Reasons to choose us as your next service partner.