Dieser Leitfaden ist derzeit auf Englisch verfügbar.
Technology / Engineering guide
Wind Turbine Measurement Calibration & Uncertainty Review
Calibration information describes an identified measurement relationship; uncertainty concerns the reported result and its supporting evaluation. Review the instrument, measurement chain and stated conditions before using an accuracy label to support a technical claim.
Keep the measurement result with its applicable evidence.
Identify the complete measurement chain, then review the calibration scope and meaning of the reported uncertainty.
01 / Reported quantity
Define the result before reviewing instrument specifications.
State what the project intends to report: a wind-speed value, electrical power at a defined point, accumulated energy or another identified quantity.
State what the project intends to report: a wind-speed value, electrical power at a defined point, accumulated energy or another identified quantity. Include the location, conditions and averaging or accumulation basis. An instrument catalogue specification cannot complete that definition.
A calculated result may combine several measured inputs. Identify those inputs and the applicable relationship. This page reviews measurement evidence rather than supplying a calibration or test procedure for a turbine.
02 / Measurement chain
Identify the devices and processing that produce the value.
Record the instrument or transducer identity, relevant range, acquisition equipment and any processing used to obtain the reported value.
Record the instrument or transducer identity, relevant range, acquisition equipment and any processing used to obtain the reported value. Include applicable configuration and conversion factors supplied by the responsible team. A sensor-only certificate may not describe the complete chain.
Keep time alignment and measurement locations visible when combining records, such as wind and electrical readings. Changes to processing, ranges or devices should be traceable to the affected results. The data-quality guide addresses record handling separately.
03 / Calibration scope
Match the certificate to the instrument and conditions.
Calibration relates an instrument response or assigned value to its stated reference through an identified process.
Calibration relates an instrument response or assigned value to its stated reference through an identified process. Review the item identity, assessed quantity, range, date, conditions and reported results. A certificate for a different serial item or measurement range should not be assumed applicable.
Record the stated correction information and limitations when relevant. The existence of a calibration document does not certify a whole turbine or automatically establish its performance. Laboratory competence and the applicable work scope require their own evidence where the project needs it.
04 / Uncertainty meaning
Read the reported interval and coverage information.
Retain the result’s uncertainty type, units and supporting evaluation.
Retain the result’s uncertainty type, units and supporting evaluation. Where expanded uncertainty is stated, record the coverage factor and coverage information as reported. A plus-or-minus figure without those definitions cannot be assumed equivalent to another uncertainty statement.
NIST describes expanded uncertainty as combined standard uncertainty multiplied by a coverage factor. That relationship does not supply a universal factor or confidence level for every measurement. Do not reinterpret an instrument resolution or repeated reading spread as the complete result uncertainty.
05 / Complete evaluation
Keep contributions and assumptions with a derived result.
Ask the responsible assessor which contributions are included in the evaluation, including applicable calibration, measurement conditions and processing effects.
Ask the responsible assessor which contributions are included in the evaluation, including applicable calibration, measurement conditions and processing effects. If results combine inputs, the evaluation needs the measurement model and any relevant dependence between inputs.
This guide provides no universal rule for adding percentages or assigning sensor accuracy. A narrow instrument specification and complete uncertainty for a field result are different evidence. Retain the evaluation reference rather than calculate a convincing-looking interval from missing information.
06 / Comparison evidence
Use uncertainty in its stated assessment context.
When comparing two reported results, retain both measurement definitions and uncertainty statements.
When comparing two reported results, retain both measurement definitions and uncertainty statements. A small numerical difference alone does not establish a meaningful improvement. The responsible reviewer must apply the method and decision basis relevant to the claim.
For a MARSTON enquiry, specify the result the project needs and request applicable measurement documents for the actual configuration. No sensor accuracy, calibration programme, laboratory accreditation or independently verified performance is claimed on this page.
Continue the review with Average Wind Speed & Wind-Speed Distributions.
Continue the review with Wind Turbine Vibration & Rotor Balance: Record Review.
Continue the review with Wind Turbine Factory & Site Acceptance: Evidence Planning.
Review CT ratios and meter scaling, cup and ultrasonic sensor records and quality flags and aggregation rules with the measurement chain and data records.
General background: NIST calibration handbook: instrument and reference scope · NIST uncertainty guide: expanded uncertainty and coverage. These references explain industry concepts; they are separate from the applicable MARSTON product and project documents.
Prepare the information for this review.
Use the checklist to organise the project information. Mark unavailable items and retain document references.
| Review item | Information to provide | Purpose |
|---|---|---|
| Result definition | Quantity, location, conditions and reporting basis | Define what was measured or derived. |
| Measurement chain | Device identities, ranges and relevant processing | Identify the complete system. |
| Calibration evidence | Item, assessed scope, results and limitations | Check applicability. |
| Uncertainty statement | Type, units, coverage information and evaluation reference | Interpret the result interval. |
| Comparison basis | Input model, assumptions and decision purpose | Avoid unsupported improvement claims. |
Engineering questions.
Does calibration mean the whole turbine is certified?
No. Calibration evidence concerns its identified measurement item and scope.
Is instrument resolution the full measurement uncertainty?
No. Resolution is one specification; the complete result needs its applicable uncertainty evaluation.
Can every plus-or-minus figure be compared directly?
Its units, type, coverage information and measurement conditions must first be identified.
Does a sensor certificate cover all acquisition and processing stages?
Do not assume that. Identify the complete measurement chain and the evidence applying to each part.
Is one coverage factor appropriate for all results?
No universal value is given here. Retain the factor and coverage interpretation supported by the actual evaluation.
What evidence helps assess a claimed improvement?
Comparable result definitions, relevant calibration and uncertainty records, configuration identities and an applicable decision basis.
Technical enquiry
Bring your project information to the discussion.
Calibration information describes an identified measurement relationship; uncertainty concerns the reported result and its supporting evaluation. Share the available information and the equipment scope you want reviewed in a technical quotation.