| Test-method fit | Confirm the tester configuration and operating procedure match the applicable standard edition and the lab’s documented method. | Review the method reference, operating instructions, and any documented deviations; do not rely on a generic “compliant” claim alone. | Check that critical parts and consumables can be inspected and replaced without altering the specified setup. | Assess whether the procedure is clear enough for trained operators to follow consistently. | The method, edition, setup, and any deviations are documented and reviewable. |
| Load and contact force | Compare how the specified load is applied and maintained at the test contact point. | Check the load-setting method and verify it using suitable, in-calibration measurement equipment across the working range. | Inspect load-bearing components, joints, and contact fixtures for wear, looseness, or deformation. | Load changes should be straightforward and should not require improvised tools or adjustments. | Measured load is repeatable and its verification records are available. |
| Motion and cycle control | Compare motion path, cycle counting, and control of the test endpoint against the laboratory procedure. | Observe a run and independently check cycle count and motion consistency using an appropriate verification method. | Run repeated cycles and inspect drive components, guides, and stops for abnormal noise, play, or drift. | Controls should make start, stop, reset, and endpoint selection unambiguous. | Cycle counts agree with an independent check, and the motion remains consistent during repeated runs. |
| Tape and specimen setup | Compare tape-path alignment, specimen restraint, and the repeatability of mounting and tensioning. | Check alignment and setup repeatability using the prescribed consumables, specimen geometry, and laboratory instructions. | Examine clamps, tape guides, and adjustment points for wear or damage that could affect positioning. | A trained operator should be able to install a specimen and tape without excessive handling or guesswork. | Setup is repeatable between operators, with alignment checks and consumable details recorded. |
| Repeatability | Compare variation across repeated tests using the same material, consumables, conditioning, and operating procedure. | Review replicate results and calculate an appropriate variability statistic; compare results only under controlled, equivalent conditions. | Check whether performance changes after routine use and whether maintenance affects results. | The setup and results should be straightforward to record for each replicate. | Replicate variation meets the laboratory’s predefined acceptance criteria. |
| Calibration and records | Compare availability of calibration or verification procedures for the parameters that affect the test. | Review traceable certificates where applicable, instrument identification, calibration status, and stated measurement uncertainty. | Check that service intervals and replacement parts are documented and obtainable. | Records should be easy to retrieve and link to the instrument, operator, and test date. | Verification status and maintenance history can be reviewed before testing. |
| Construction and serviceability | Compare frame rigidity, component finish, guarding, and access to routine service points. | Check for movement or vibration that could affect alignment or contact conditions during operation. | Inspect joints, guides, fasteners, and wear surfaces; ask for documented maintenance guidance. | Routine cleaning and inspection should be possible without disturbing calibrated settings. | The instrument is stable, inspectable, and supported by a clear maintenance procedure. |
| Operator safety | Compare guarding, pinch-point access, electrical safety information, and emergency stopping arrangements. | Confirm safety features do not interfere with the prescribed test setup or operating procedure. | Check that guards and safety controls remain secure and functional during routine inspection. | Labels and operating instructions should clearly explain safe setup and use. | A documented risk review finds no unresolved hazards for the intended workspace. |
| Overall selection | Compare verified method fit, measurement evidence, repeatability, service needs, and operator workflow—not headline claims alone. | Use a documented acceptance checklist and, where practical, a witnessed evaluation with representative specimens. | Include expected maintenance, consumable availability, and service response in the assessment. | Evaluate setup time, training needs, cleaning, and data-recording effort with intended users. | Select the configuration that passes documented lab requirements with acceptable lifecycle and workflow demands. |