QMS - NAPT Helpdesk

The guidance in this document is meant to assist NAPT participants in understanding the requirements when reporting their data submittal / results to NAPT.  Please note It is the participant’s responsibility to understand and adhere to all instructions as part of participation.  Failure to properly report results may result in a participant receiving an unsatisfactory rating.  

NAPT staff does not correct results when a participant submits inappropriate results.

Participant’s Reported Value: The NAPT instruction sheet makes a statement that the participant must correlate (adjust) the artifact reading to match the measurement value exactly before reporting readings. It is the participant’s responsibility to correlate data accurately. An example is given below for participant guidance.

Correlation / Correction  - Example 

For this example measurement, The Nominal Value is called “Readings on Participant’s Standard” and the Measured Value, in this case, is called “Readings on UUT”. The value that must be reported to NAPT is the reading from the UUT (the NAPT artifact), corrected to the nominal value on the data reporting sheet.

If a participant could not achieve a stable reading on their reference standard at the nominal value listed on the data reporting sheet ( DRS ), in this case, 20.000 ºC, then the participant must correct for any deviation from the nominal before submitting results.  Let us assume the participant could not get a stable reading at 20.000 ºC but was able to get a stable reading at 20.300 ºC.  The reading on the UUT was 20.301 ºC.  For NAPT to properly compare the results of this measurement, the participant must correlate the reading on their reference standard back to the value stated on the data reporting sheet and correlate the UUT reading accordingly.  Doing so would make the correct reported value 20.001 ºC.  At the zero point, an ice point was used so the standard reading was 0.010 ºC and the reading of the UUT was 0.010 ºC. The correct value to be reported would not be 0.010 ºC but rather 0.000 ºC.

Uncertainty of Measurement:  Reported uncertainty must represent each measurement taken, NOT a specification of the range or just the uncertainty of the reference standards incorporated in the measurement. It is the uncertainty of the measurement made and not a number or specification off a scope of accreditation.

In the first example below, the participant did not report the associated uncertainty in the same unit of measurement as the reported value.  Instead, the participant reported a blanket statement rather than an actual value.

The second example, table, shows how the measurements should be reported.

Wrong Reporting 

Correct Reporting