Every division before this one produces a result. Division 25 asks whether that result can be trusted — was the instrument correctly identified, in calibration, and appropriate for the method used; was the acceptance limit traceable to an approved basis; was the record reviewed. It is deliberately positioned as the final technical-quality division of the framework, because the validity of every preceding test in Divisions 01–24 depends on the reliability of the test equipment, the suitability of the test method, and the quality of the recorded measurement behind it.
Governing Principle: a test result is only as reliable as the test method, test equipment, calibration status, measurement conditions, and technical review supporting that result. Division 25 does not repeat the performance tests of earlier divisions — it audits the instruments, calibration status, and review process that stand behind them.
Every critical measurement in the manual is expected to pass through the same result-quality gate before it is treated as evidence of compliance.
The result-quality gate runs as a fixed sequence — no critical measurement is treated as final acceptance evidence until every stage below has been satisfied.
| Stage | What It Confirms |
|---|---|
| Raw Value & Unit | The raw measured value is recorded with correct units before any evaluation takes place |
| Equipment & Calibration | The test equipment used is correctly identified and its calibration status is valid at the time of test |
| Acceptance-Limit Check | The acceptance limit applied is traceable to an approved specification, drawing, standard, or procedure |
| Result Evaluation | The measured value is evaluated against the correct acceptance limit for a Pass/Fail outcome |
| Technical Review | The result and its supporting evidence are independently reviewed for completeness and consistency |
| Retest / Corrective Action | Retesting or corrective action is completed and documented wherever required |
| Final Acceptance | The reviewed, traceable result is closed out and archived as part of the commissioning record |
Grouped as Test Equipment, Calibration, and Test Quality — click any topic to expand its verification checks and readiness criteria.
Readiness Criteria: every insulation-resistance tester used is correctly identified, in calibration, and set to the range appropriate for the circuit under test.
Readiness Criteria: instrument identity, method, and calibration reference are recorded against every earth-resistance result.
Readiness Criteria: the meter and leads are appropriate for the electrical environment and measurement being performed, and are within calibration.
Readiness Criteria: clamp meter range and jaw condition are confirmed suitable for the specific current measurement being performed.
Readiness Criteria: measurement setup and calibration are verified before test, and actual measured values are recorded wherever quantitative performance is required.
Hold Point: high-voltage testing does not proceed without an approved test procedure and the full set of associated safety controls in place.
Readiness Criteria: equipment ID and test configuration are recorded in every cable test report, with the correct method applied for the cable type.
Readiness Criteria: CCR test equipment capability, calibration, and connection arrangement are confirmed before performance testing begins.
Readiness Criteria: photometric equipment calibration, alignment, and environmental conditions are verified and recorded before any photometric result is accepted.
Readiness Criteria: colour-measurement results record instrument, calibration reference, and the applicable acceptance criterion alongside the measured value.
Readiness Criteria: alignment equipment accuracy, calibration, and reference system are confirmed appropriate to the specific fixture type being aligned.
Readiness Criteria: a clear traceability chain — instrument to measurement to fixture to location to result — is maintained for every optical measurement.
Readiness Criteria: communication-test equipment configuration and interface compatibility are confirmed before use on any control or comms circuit.
Readiness Criteria: network-test equipment configuration and test method are confirmed appropriate to the networked system under test, with records retained.
Readiness Criteria: calibration equipment itself is appropriately controlled, traceable, and used under the correct environmental conditions and procedure.
Hold Point: an instrument found NOT VALID FOR USE is not used for any test, regardless of urgency, until its calibration status is resolved.
Readiness Criteria: every calibration certificate referenced in a test record is confirmed to belong to the exact instrument, by serial number, used for that test.
Readiness Criteria: the calibration register is current, and no overdue instrument remains available for use without a documented restriction.
Readiness Criteria: every controlled instrument in use has a unique, consistently formatted ID linked to its calibration and ownership record.
Readiness Criteria: the full traceability chain from result back to calibration reference can be reconstructed for any test record, particularly for audits, disputes, and acceptance testing.
Readiness Criteria: measurement uncertainty is explicitly considered for any acceptance decision resting on a value close to its limit, per the applicable project/test-method requirement.
Hold Point: any result potentially generated with out-of-calibration equipment is flagged for technical review before it is relied on for acceptance.
Readiness Criteria: maintenance activity and return-to-service status are recorded for every instrument taken out of service for repair.
Readiness Criteria: storage conditions protect calibration condition and physical integrity, with photometric equipment given additional optical and alignment protection.
Readiness Criteria: the full pre-use checklist is completed and satisfactory before any critical test begins.
Readiness Criteria: the selected test method is confirmed technically suitable for the intended measurement before the result is relied on.
Readiness Criteria: every important test result passes a technical review that specifically screens for missing, impossible, or inconsistent values before acceptance.
Hold Point: a result is not accepted against a limit that cannot be traced to an approved technical basis.
Readiness Criteria: recorded test data is complete, correctly identified, and free of unexplained alteration.
Readiness Criteria: unexplained variation between repeated measurements is investigated and resolved before the result is accepted as reliable.
Readiness Criteria: every completed test record carries a full, signed set of identification, values, and revision information before it is filed.
Readiness Criteria: critical documentation passes a technical review that confirms the recorded evidence demonstrates compliance with the specified requirement — not merely a Pass label.
Readiness Criteria: independent verification, where required, is fully traceable — original result, verification result, reviewer, and disposition are all on record.
Readiness Criteria: only the current, approved revision of any controlled document is in active use, with obsolete versions withdrawn.
Readiness Criteria: the test procedure itself is confirmed approved, current, technically appropriate, and consistent with the equipment actually used — closing the Testing & Commissioning Manual on a procedure that has itself been verified.
Eight principles run underneath every topic in this division — they are what the checklists above exist to enforce.
Every critical result should be traceable to the instrument and calibration status.
A technically inappropriate test method cannot produce a reliable acceptance decision merely because the instrument is calibrated.
Acceptance limits must come from the applicable approved technical basis.
Where practical, retain the original measurement data supporting the final report.
Critical results should receive appropriate technical review.
Results potentially affected by invalid equipment must be identified and technically assessed.
Only the approved/current test procedure should be used.
A Pass/Fail decision should be supported by identifiable technical evidence.
When an instrument is discovered out of calibration mid-project, the same nine-step sequence applies regardless of which division's test it affects.
Determine which instrument is out of calibration.
Stop use of the instrument immediately.
Determine which tests and dates used the instrument.
Check the calibration history and prior due dates.
Determine the potential impact on affected results.
Formally review the affected results.
Retest where required and update results.
Record the corrective action taken.
Restore the equipment to controlled status once recalibrated.
Quick answers about Division 25 — Test Equipment, Calibration & Engineering Quality in the AGL Testing & Commissioning Manual.
Division 25 of the AGL Testing & Commissioning Manual covers Test Equipment, Calibration & Engineering Quality. Every division before this one produces a result. Division 25 asks whether that result can be trusted — was the instrument correctly identified, in calibration, and appropriate for the method used; was the acceptance limit traceable to an approved basis; was the record reviewed. It is deliberately positioned as the final technical-quality division of the framework, because the validity of every preceding test in Divisions 01–24 depends on the reliability of the test equipment, the suitability of the test method, and the quality of the recorded measurement behind it. It contains 35 topics (TC-TEQ-001 to TC-TEQ-035) organised into 3 groups (A–C), each topic with its own verification checks.
Governing Principle: a test result is only as reliable as the test method, test equipment, calibration status, measurement conditions, and technical review supporting that result. Division 25 does not repeat the performance tests of earlier divisions — it audits the instruments, calibration status, and review process that stand behind them.
Every critical measurement in the manual is expected to pass through the same result-quality gate before it is treated as evidence of compliance. Steps: Test Performed → Raw Value Recorded → Equipment & Calibration Verified → Acceptance Limit Verified → Result Evaluated → Technical Review → Retest If Required → Final Acceptance. Focus areas: Test equipment control; Calibration & traceability; Test method validity; Technical review & evidence.
Division 25 has 35 topics in 3 groups. A — Test Equipment: Insulation-Resistance Tester, Earth-Resistance Tester, Multimeter, Clamp Meter, Power Analyzer, High-Voltage Test Equipment, Cable-Test Equipment, CCR Test Equipment, Photometric Equipment, Colour-Measurement Equipment, Alignment Equipment, Optical Measurement Equipment, Communication-Test Equipment, Network-Test Equipment, Calibration Equipment. B — Calibration: Calibration-Status Verification, Calibration-Certificate Verification, Calibration Interval Control, Instrument Identification, Measurement Traceability, Measurement Uncertainty Awareness, Out-of-Calibration Equipment Control, Instrument Maintenance, Instrument Storage, Instrument Pre-Use Verification. C — Test Quality: Test-Method Validation, Test-Result Review, Acceptance-Limit Verification, Test-Data Quality Review, Repeatability Verification, Test-Record Review, Technical Review, Independent Verification, Revision Control, Test-Procedure Audit.
The result-quality gate runs as a fixed sequence — no critical measurement is treated as final acceptance evidence until every stage below has been satisfied. Raw Value & Unit: The raw measured value is recorded with correct units before any evaluation takes place; Equipment & Calibration: The test equipment used is correctly identified and its calibration status is valid at the time of test; Acceptance-Limit Check: The acceptance limit applied is traceable to an approved specification, drawing, standard, or procedure; Result Evaluation: The measured value is evaluated against the correct acceptance limit for a Pass/Fail outcome; Technical Review: The result and its supporting evidence are independently reviewed for completeness and consistency; Retest / Corrective Action: Retesting or corrective action is completed and documented wherever required; Final Acceptance: The reviewed, traceable result is closed out and archived as part of the commissioning record.
Eight principles run underneath every topic in this division — they are what the checklists above exist to enforce. (1) Measurement Traceability — Every critical result should be traceable to the instrument and calibration status; (2) Method Validity — A technically inappropriate test method cannot produce a reliable acceptance decision merely because the instrument is calibrated; (3) Acceptance-Basis Control — Acceptance limits must come from the applicable approved technical basis; (4) Raw Data Preservation — Where practical, retain the original measurement data supporting the final report; (5) Independent Review — Critical results should receive appropriate technical review; (6) Out-of-Calibration Control — Results potentially affected by invalid equipment must be identified and technically assessed; (7) Revision Control — Only the approved/current test procedure should be used; (8) Evidence-Based Acceptance — A Pass/Fail decision should be supported by identifiable technical evidence.
When an instrument is discovered out of calibration mid-project, the same nine-step sequence applies regardless of which division's test it affects. (1) Identify — Determine which instrument is out of calibration; (2) Remove From Service — Stop use of the instrument immediately; (3) Identify Affected Tests — Determine which tests and dates used the instrument; (4) Review History — Check the calibration history and prior due dates; (5) Assess Impact — Determine the potential impact on affected results; (6) Technical Assessment — Formally review the affected results; (7) Retest — Retest where required and update results; (8) Document — Record the corrective action taken; (9) Return to Service — Restore the equipment to controlled status once recalibrated.
Every test result in this manual is only as good as the equipment and quality process behind it.
Build the technical knowledge to understand calibration traceability, measurement uncertainty, and the engineering quality practices that make a test result defensible rather than just a number on a screen.
Calibrate with precision. Trust the result. Commission with certainty.
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