NATIONAL BUREAU OF STANDARDS REPORT
6l58
INTERLABORATORY INTERCOMPARISONS
OF
500-WATT TUNGSTEN-FILAMENT STANDARDS
OF LUMINOUS FLUX
by
Velma I. Burns
U. S. DEPARTMENT OF COMMERCE
NATIONAL BUREAU OF STANDARDS
THE NATIONAL BUREAU OF STANDARDS
Functions and Activities
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national bureau of standards reportNBS PROJECT NB9 REPORT
0201-20-0205 October 1958 6l58
INTERLABORATORT INTERCOMPARISONS
of
500-Watt Tungsten-Filament Standards
of Luminous Flux
by
Velma I. BurnsPhotometry and Colorimetry SectionOptics and Metrology Division
NATIONAL BUREAU OF ST
Intended for use. wjthln the
additional evaluation and
listing of this Report, either
the Office of the Director, N
however, by the Governmen'
to reproduce additional cop>.
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Approved for public release by thedirector of the National Institute ofStandards and Technology (NIST)
on October 9, 2015
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ormally published it is subjected
t, reproduction, or open-literature
lesion Is obtained in writing from
Such permission Is not needed,
iy prepared If that agency wishes
II. S. DEPARTMENT OF COMMERCE
NATIONAL BUREAU OF STANDARDS
. >
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Interlaboratory Intercomparisonsof
500-watt Tungsten-Filament Standardsof Luminous Flux
by Velma Io Bums
Abstract
A group of six inside-frosted and seven clear 5>00-watt lamps weremeasured by eight laboratories . The average luminous flux was 96U7 lumensfor the frosted lamps and 95>Ui lumens for the clear lamps. The average ofthe percent deviations from the overall average for the eight laboratorieswas .39$ in the case of the inside frosted lamps and .3h% in the case ofthe clear lamps*
I. Introduction
This intercomparison was undertaken to determine the uniformity ofmeasurements of luminous flux for these types of lamps at the participatinglaboratories. The laboratories participating and the order of reading areas follows
:
I. Champion Lairp Works11(a). Sylvania Electric Products, Inc. (using 60 in. sphere
3 runs)
II (b). Sylvania Electric Products^ Inc. (using 100 in. sphere2 runs)
III. Electrical Testing Laboratories, Inc.IV. Westinghouse Lamp DivisionV. Duro Test Corporation
VI. General Electric CompanyVII o National Bureau of Standards
VIIIo Electrical Testing Laboratories, Inc.
IX. Sylvania Electric Products, Inc.
X. Interlectric CorporationXI. Champion Lamp Works
The order in which the laboratories made their readings was chosen to
reduce shipment of the lamps as much as possible. Each laboratory followedits own cus tanary procedure in making the measurements. The ElectricalTesting Laboratories Inc., §ylvania Electric Products Inc., and ChampionLamp Works measured the lamps more than once and all values reported arelisted in the tables which follow. Only the first values reported by these
laboratories, however, were used in calculating averages for all laboratories.
II* Results of Measurements
The values of current reported by each laboratory are given in Table I.
The values of luminous flux are given in Table II. For all measurementsthe lamps were operated at 120 volts.
The range of the average values in percent are shown below.
Lamp Type
frostedClear
Current LuminousRange Flux Range
0.53* 1.6l*.72* 1.5W
An analysis of the results was made as follows:
LetF = Luminous flux measured value.
*La= Luminous flux measured by a given laboratory, L, for a
given lamp, a*
F * Average of all luminous flux measurements made by all thelaboratories for one type of lamp.
* Average luminous flux for all the lamps of a given type
measured at a given laboratory.
F& - Average of luminous flux measurements made on a given lanp
at all the laboratories.
A * deviations
AL = FL - f
A a - *3.- *
Hie residual error, V , for each lamp measured at each laboratory, wasfound by the following formula
*-*La "F -AL -AaThe probable error in the average value, F^, is given by the expression
pg . 0.8U53 I*n Tn-J
where n is the number of observations
'
*•
.•
. ,
’.
. ,^
...-
.
* -
.
'
-
.
- 3 -
The huge error in FL is
HE U.9 x PE
The huge error for each laboratory is a measure of how closely theaverage reported by that laboratory (F^) represents measurements made atthat laboratory# The huge error for each laboratory in percent of F is
shown in Table II# It can be shown that laboratories having largerthan $HE may be on a basis of measurement different from that of the
other laboratories#
III. Discussion
There is fair agreement between the participating laboratories on
values of current and luminous flux* The range in the average values of
current reported for frosted lamps is 0.5>3$ of the average values reportedby all laboratories. For the clear lamps the range is 0.72$. The rangein the average values of luminous flux reported for the frosted lamps is
1 . 61/6 of the average of values reported by all laboratories and for theclear lamps the range is 1.5U$*
By treating the average values reported by each of the eight labora-tories as a series of eight measurements and by using the formula
HE * U.9 °^U53£&ln^n=l
the huge error in the average for all the laboratories (F) was found tobe 0.61$ for the frosted lamps and 0.3>3$ for the clear lamps. Then byusing the same series of measurements and the formula
HE -U.9°° 8Ug3g^
Vn(n-l)
the huge error in the average reported by any one laboratory was found to
be 1.71$ for the frosted lamps and l#5l$ for the clear lamps.
The average percent deviation in luminous flux values reportedis 0.39$ for the frosted lamps and 0.3U$ for the clear lamps.
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of
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in
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of
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Lamps
Operated
at
120
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U. s. DEPARTMENT OF COMMERCESinclair Weeks, Secretary
NATIONAL BUREAU OF STANDARDSA. V. Astin, Director
THE NATIONAL BUREAU OF STANDARDS
The scope of activities of the National Bureau of Standards at its headquarters in Washington,D. C., and its major laboratories in Boulder, Colo., is suggested in the following listing of the
divisions and sections engaged in technical work. In general, each section carries out specialized
research, development, and engineering in the field indicated by its title. A brief description of
the activities, and of the resultant publications, appears on the inside front cover.« r
WASHINGTON, D. C.
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tation. Electrochemistry.
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ity. X*ray6. Betatron. Nucleonic Instrumentation. Radiological Equipment.
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i
