Definition of Calibration ?

Definition of Calibration
Calibration is the process of comparing the measurement values provided by a device under test (DUT) with those of a known, traceable reference standard. The reference instrument—also referred to as the calibrator—must have a higher degree of accuracy and be traceably calibrated.

Objectives of Calibration

1. Accuracy

• Error Detection: Identifies discrepancies between the DUT and the reference standard.
• Adjustment: Enables corrections to the DUT to ensure measurement precision.

2. Reliability

• Confidence in Measurements: An accurately calibrated device provides dependable data, which is critical for scientific experiments, industrial processes, and any context where precision matters.

Why is Calibration Required ?

Calibration ensures the traceability and accuracy of measurement instruments, aligning them with recognized standards and maintaining the integrity of measurement systems.

Reasons for regular calibration include:

• Measurement Accuracy: Calibration aligns instruments with reference standards, ensuring reliable measurement data.
• Safety Compliance: Accurate instruments reduce the likelihood of safety incidents, especially where precision is critical (e.g., labs, industry, healthcare).
• Process Optimization: Calibrated instruments improve repeatability and consistency in operational workflows.
• Cost Avoidance: Identifies potential instrument degradation early, minimizing downtime and repair costs.
• Confidence in Results: Supports decision-making and regulatory compliance by ensuring measurement credibility.
• Instrument Health Monitoring: Regular calibration detects performance drift, extending the functional lifespan of equipment.

Recommended Calibration Frequency ?

Devices should be calibrated once per year.
Annual calibration enhances device reliability and extends service life.
It is therefore recommended to perform regular calibration checks to ensure accurate and consistent performance.

Traceability: A Pillar of Accurate Measurement

In metrology, traceability refers to the documented and unbroken chain of calibrations linking a measurement instrument to a recognized standard, typically a national or international standard. Each instrument must be calibrated using a more accurate standard, with the associated measurement uncertainty clearly defined at every level.

For example, a portable calibrator used in the field must itself be calibrated against a laboratory-grade reference standard, which in turn should be traceable to a national metrology institute (NMI). These NMIs often collaborate through inter-laboratory comparisons to ensure international equivalence of measurements.

Disrupting this chain at any point undermines the credibility of measurement results. Therefore, maintaining continuous traceability is essential to ensure data validity, regulatory compliance, and metrological integrity.

Adjustment and Calibration Process

Introduction of the Terms “As Found” and “As Left”

In professional calibration, two key steps are often mentioned: As Found and As Left. These steps are essential to ensure the accuracy of a measuring instrument and to document its condition before and after any intervention.

Process Steps

1. As Found

Purpose: Evaluate the initial condition of the instrument as it was found.
This step determines whether the instrument is measuring correctly or if there are deviations.
No adjustments are made at this stage — it is purely an observation.

2. Adjustment

If deviations are detected during the As Found step, an adjustment is carried out.
The goal of this adjustment is to bring the instrument back within the expected accuracy range.

3. As Left

After the adjustments have been made, a second calibration is performed.
This step confirms that the adjustments have successfully returned the instrument to within specified tolerances.

Quality Commitment Statement

Our laboratory, while not currently accredited, operates under a robust quality management system certified to ISO 9001 standards. This certification demonstrates our commitment to maintaining stringent quality controls, ensuring accuracy and reliability in all calibration procedures. We emphasize continuous improvement and compliance with industry best practices across our entire operational workflow.
For detailed information, please refer to our Quality Policy page.

Device Maintenance Instructions

To initiate service, please submit your request via our contact form. Alternatively, you may email us at [email protected] if you experience issues with the form.

When sending your device, include the following:

• Reason for service
• Device model
• Serial number
  Ensure the instrument is properly cleaned and accompanied by its safety data sheet (SDS) to meet safety compliance requirements.

Upon arrival, the device will undergo a diagnostic check. A quote will be issued and sent to you. After your approval, the device will be repaired or calibrated. A calibration or service certificate will be issued and returned with the unit to your specified address.