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

Request a Quote View our Accreditation
  • Levels of UKAS Balance Calibration
  • About Your UKAS Balance Calibration Certificate
  • Range of UKAS Balance Calibration

Levels of UKAS Balance Calibration

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

  • Perform a 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, 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 a, 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, 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, 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 a series of repetitive weighings of a value at or near the maximum capacity 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 a series of 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 within 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:

  • Uncertainty of the weights used.
  • The standard deviation of the readings in repeatability.
  • The readability of the instrument.
  • The environmental conditions where the instrument was sited.

Range of UKAS Balance Calibration

Whole Range or Each Range Calibration

Balances may have the ability to display multiple ranges, these are called dual range or poly range balances. i.e a single range balance with a capacity of 200g and a readability of 0.01mg throughout, a dual range balance with a capacity of 200g may have a readability of 0.01mg for part of the capacity and then 0.1mg for the remainder of the range. This allows the manufacturer to produce equipment with wider tolerances in manufacturing because the resolution decreases with weight.

Whole Range Calibration

  • Calibrated from zero to capacity of the instrument*.
  • All ranges detailed on the first page of the calibration certificate.
  • All readabilities detailed on the first page of the calibration certificate.
  • Where the readability changes will be visible on the calibration results page for the instrument.

Each Range Calibration

  • Calibrated from zero to capacity of each of the instruments ranges*.
  • All ranges detailed on the first page of the calibration certificate.
  • Each readability will have its own calibration results page.

Limited Range Calibration

This is similar to Whole Range or Each Range calibration but instead of going to the capacity of the instrument or capacity of the range we will calibrate to a point agreed with you.

* calibration may not be to 100% capacity of the instrument, for example an instrument with a capacity of 210g may be calibrated to 200g.