Questions and Answers.docx

Questions and Answers Question 1: Eccentricity acceptance – The SOW specifies “eccentricity contribution < 0.05 µg.” Please confirm if the acceptance method should be defined as a 4- or 5-position test with criterion “≤ 1 d across positions” at a specified off-center radius.

NIST Response: EURAMET cg-18 prescribes 5 positions. The absolute differences should be less than 0.05 µg.

Question 2: Linearity acceptance – The SOW specifies “linearity contribution < 15 µg.” Please confirm if the intent is to evaluate linearity at discrete points across the working nominal range using a maximum absolute deviation decision rule, rather than a strict < 15 µg limit across the entire 0–52 g span.

NIST Response: A 15 µg decision rule will be considered at and below 30 g. Above 30 g a 25 µg decision rule will be considered.

Question 3: Artifacts & range (primary driver)- Which weight standard and highest class will be used for training/acceptance (e.g., OIML R111—E0/E1/E2/F1/F2/M1/M2, or ASTM E617—Class 0/1/2/3)?

NIST Response: OIML E1 and E2; ASTM Class 0.

Question 4: Artifacts & range (primary driver)- What nominal mass range do you expect to use during training/acceptance (e.g., 50 g up to 1 kg)?

NIST Respnse:10 g E2 or Class 0 weight.

Question 5: Automation & throughput - Do you prefer manual placement or an automatic loader/turntable for training workflows?

NIST Response: Manual Question 6: Automation & throughput - If automatic, what’s the typical number of weights per run and the heaviest nominal you want handled automatically?

NIST Response: Manual so this is not applicable Question 7: Measurement acceptance framing- For repeatability, how many cycles (e.g., ABBA/ABA) and what decision rule should apply—strict “< 2 µg at max load,” or is “≤ 2 µg at max load” acceptable (with typical-load values noted)? Any outlier treatment you want us to follow?

NIST Response: Follow EURAMET cg-18 repeatability evaluation with less than 2 ug.

Question 8: Measurement acceptance framing- For eccentricity, do you plan a 4- or 5-position test, and should acceptance be a numeric contribution in µg or a “≤ 1 d across positions” criterion?

NIST Response: Follow EURAMET cg-18 eccentricity test with no deviation greater than 0.05 microgram.

Question 9: Measurement acceptance framing- For linearity, how many test points and what calculation should govern acceptance (e.g., maximum absolute deviation ≤ 15 µg, or another method)?

NIST Response: Follow EURAMET cg-18 with less than max 15 ug.

Question 10: Environment, ESD & ergonomics - Do you require electrostatic control (ionizer and anti-static accessories) during training/acceptance?

NIST Response: Yes, a balance with ionizer capability is warranted.

Question 11: Environment, ESD & ergonomics - Should environmental conditions (temperature/relative humidity/pressure—and, if applicable, vibration) be measured by built-in sensors and logged during sessions?

NIST Response: Not necessary Question 12: Will vibration isolation (e.g., granite anti-vibration table) required?

NIST Response: No, additional isolation is not required