CCPR-K3.b, APMP.PR-K3.b, CCPR-K3.b.2, CCPR-K3.b.1
and EUROMET.PR-K3.b.1
MEASURAND : Luminous responsivity of photometers
The key comparison reference value is obtained as the weighted mean of the participants' results (KRISS excluded) with application of a cutoff of 0.2%
Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), expressed in %
Red diamonds: CCPR-K3.b participants,
Green triangle: amended MSL value,
Blue circles: APMP.PR-K3.b participants only,
Pink square: CCPR-K3.b.2 participant,
Black (empty) square: CCPR-K3.b.1 participant,
Brown cross: EUROMET.PR-K3.b.1 participant.
*uncertainty cutoff (0.2%) applied to those laboratory measurements in the calculation of the key comparison refrence value, xR
**laboratory excluded from the calculation of xR
CCPR-K3.b, APMP.PR-K3.b, CCPR-K3.b.2, CCPR-K3.b.1
and EUROMET.PR-K3.b.1
MEASURAND : Luminous responsivity of photometers
| Lab i | Di | Ui |
| / % | / % | |
| LNE-INM | -0.80 | 0.57 |
| IFA | 0.38 | 0.61 |
| NMIA* | 0.09 | 0.39 |
| HUT | -0.35 | 0.61 |
| MSL | -0.81 | 0.51 |
| (KRISS) | 2.10 | 0.64 |
| NIM* | 0.13 | 0.30 |
| NIST | -0.15 | 0.42 |
| NPL* | -0.03 | 0.39 |
| NRC | 0.00 | 1.01 |
| METAS | 1.02 | 0.51 |
| OMH | -0.37 | 0.57 |
| PTB* | 0.35 | 0.37 |
| SMU | -0.24 | 1.54 |
| VNIIOFI | 0.30 | 0.49 |
| BIPM | -0.16 | 0.51 |
| MSL** | 0.15 | 0.52 |
| CMS/ITRI | 1.3 | 1.4 |
| KRISS | -1.3 | 0.8 |
| NPLI | 1.4 | 2.6 |
| SPRING Singapore | -0.3 | 1.2 |
| KRISS | -0.53 | 0.60 |
| SPRING Singapore | 0.17 | 0.30 |
| UME | 0.41 | 0.63 |
Note: The "Lab j" list is given in the same order as the "Lab i" list.
* cutoff uncertainty (0.2%) applied to those laboratory measurements in the calculation of the key comparison reference value
( ) laboratory excluded from the calculation of the key comparison reference value
** MSL values after re-establishment of its primary reference
In blue: laboratories participant in APMP.PR-K3.b
In pink laboratory participant in CCPR-K3.b.2
In black: laboratory participant in CCPR-K3.b.1
In brown: laboratory participant in EUROMET.PR-K3.b.1
Results are presented under A4 printable format in Summary Results (.PDF file).
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO-31-0 Annex B Rule B.
| Metrology area, Sub-field | Photometry and Radiometry, Photometry |
| Description | Luminous responsivity (Bilateral comparison) |
| Time of measurements | 2004 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| References | |
| Measurand | Luminous responsivity |
| Transfer device | Four standard photometers |
| Comparison type | Key Comparison |
| Consultative Committee | CCPR (Consultative Committee for Photometry and Radiometry) |
| Conducted by | EURAMET (European Association of National Metrology Institutes) |
| RMO Internal Identifier | EUROMET Project No 824 |
| Comments | This bilateral comparison, carried out in the framework of the EUROMET Project No 824, is a follow-up of key comparison CCPR-K3.b. APMP.PR-K3.b, CCPR-K3.b.2, CCPR-K3.b.1, and EUROMET.PR-K3.b.1 results are linked to those of CCPR-K3.b. First CCPR-K3.b results were published on 5 July 2001, then revised results were published on 12 January 2004. Luminous responsivity of photometers |
| Pilot institute |
IFA-CSIC
Instituto de Fisica Aplicada - Consejo Superior de Investigaciones Cientificas, now IO-CSIC, Instituto de Optica Daza de Valdés Spain |
| Contact person | A. Pons Aglio +34 91 561 8806 |
| UME |
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
CCPR-K3.b, APMP.PR-K3.b, CCPR-K3.b.2, CCPR-K3.b.1
and EUROMET.PR-K3.b.1
MEASURAND : Luminous responsivity of photometers
The individual measurements, xi, of the participating laboratories correspond to the results of a virtual calibration of the luminous responsivity of the same photometer.
|
The key comparison reference value, xR, is calculated as the weighted mean of the participants' results, weighted by the inverse square of the individual standard uncertainties, ui, with the application of a minimum uncertainty cutoff of 0.2%. |
| The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: Di = (xi - xR) and Ui, its expanded uncertainty (k = 2), both expressed in relative units. Ui = 2(ui2 + uR2 - ucorr2 + utransfer2)1/2, where ucorr is the correlation between ui and uR. utransfer = 0.09%. |
| The degree of equivalence between two laboratories is given by a pair of terms: Dij = Di - Dj = (xi - xj) and Uij, its expanded uncertainty (k = 2), both expressed in relative units. Uij = 2(ui2 + uj2 + 2utransfer2)1/2. |
Subsequent to the key comparison CCPR-K3.b and prior to the key comparison APMP.PR-K3.b, MSL re-established its primary reference, finding a relative change in value of +0.96% with a standard uncertainty of 0.04%.
Three laboratories (NMIA, MSL, and KRISS) participated in both comparisons. KRISS identified a problem with its reference photometer in the CCPR-K3.b key comparison, and the values obtained were not reliable. The two linking laboratories are thus: NMIA and MSL.
The computation of the linkage is described on pages 6 and 7 of the APMP.PR-K3.b Final Report. The calculation of the degrees of equivalence relative to the CCPR-K3.b key comparison reference value, Di and Ui, and between pairs of laboratories, Dij and Uij, is available from the Appendix B of the same Final Report.
Notes:
- For the two linking laboratories (NMIA and MSL), no new results are generated by the key comparison APMP.PR-K3.b.
- A new result is produced by the key comparison APMP.PR-K3.b for KRISS.
- The degrees of equivalence between two participants in APMP.PR-K3.b only, or between one participant in APMP.PR-K3.b only and one of the linking laboratories (NMIA or MSL) are calculated directly from the results of APMP.PR-K3.b:
Dij is calculated as the difference of the deviations from the pilot laboratory, and
Uij is calculated as twice the square root of the quadratic sum of the standard uncertainties of the deviations from the pilot laboratory.
- The degrees of equivalence between one participant in APMP.PR-K3.b only and one participant in CCPR-K3.b (except NMIA and MSL) are calculated as:
Dij = Di - Dj and Uij = (Ui2 + Uj2)1/2.
The correlation brought by the key comparison reference value is negligible.
The link to the key comparison CCPR-K3.b is given by the pilot laboratory HUT that participated in both comparisons. No new results are produced by the key comparison CCPR-K3.b.2 for HUT.
The degree of equivalence of KRISS relative to the CCPR-K3.b key comparison reference value is given by:
DKRISS = -0.0053 and UKRISS = 0.0060, see Appendix 2 of the CCPR-K3.b.2 Final Report.
The degrees of equivalence between KRISS participant in CCPR-K3.b.2 and one laboratory participant in CCPR-K3.b are calculated, see Appendix 2 of the CCPR-K3.b.2 Final Report.
The degrees of equivalence between KRISS participant in CCPR-K3.b.2 and a laboratory participant in APMP.PR-K3.b only are not calculated.
The link to the key comparison CCPR-K3.b is given by the pilot laboratory NMIA that participated in both comparisons. No new results are produced by the key comparison CCPR-K3.b.1 for NMIA.
The degree of equivalence of SPRING Singapore relative to the CCPR-K3.b key comparison reference value is given by:
DSPRING Singapore = 0.0017 and USPRING Singapore = 0.0030, see Section 9 of the CCPR-K3.b.1 Final Report.
The pair-wise degrees of equivalence involving SPRING Singapore participant in CCPR-K3.b.1 are not calculated.
The link to the key comparison CCPR-K3.b is given by the pilot laboratory IFA that participated in both comparisons. No new results are produced by the key comparison EUROMET.PR-K3.b.1 for IFA.
The degree of equivalence of UME relative to the CCPR-K3.b key comparison reference value is given by:
DUME = 0.0041 and UUME = 0.0063, see Appendix 2 of the EUROMET.PR-K3.b.1 Final Report.
The degrees of equivalence between UME and the laboratories participant in CCPR-K3.b are given in Appendix 2 of the same Final Report, and reported in the Matrix of equivalence.
CCPR-K3.b, APMP.PR-K3.b, CCPR-K3.b.2, CCPR-K3.b.1
and EUROMET.PR-K3.b.1
No Laboratory Individual Measurements are available for these comparisons.
Please see Equivalence statements.
