SMALL INTEGRATING METER FOR ASSESSING LONG-TERM EXPOSURE TO MAGNETIC-FIELDS

被引:10
作者
KAUNE, WT [1 ]
NIPLE, JC [1 ]
LIU, MJ [1 ]
SILVA, JM [1 ]
机构
[1] ENERTECH CONSULTANTS,CAMPBELL,CA
关键词
60-HZ; FIELD METER; EXPOSURE ASSESSMENT;
D O I
10.1002/bem.2250130508
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
A small, lightweight meter has been developed for magnetic-field measurements, particularly those needed for exposure-assessment purposes. This meter, known as the AMEX-3D, continuously measures all three axes of magnetic-flux density and electronically combines the data into a single estimate of cumulative exposure to the root-mean-square (rms) resultant flux density. The AMEX-3D weighs about 120 g, measures 2.7 cm x 5.1 cm x 10.2 cm, and is battery powered. Two panel-mounted jacks are provided for measuring battery voltage and for reading cumulative exposure data from the unit. The instrument has, within 3 dB, a flat response to magnetic flux densities at all frequencies in its 30-1,000 Hz bandwidth. A detailed analysis of error sources in the AMEX-3D leads to an estimate of +/- 20% as the accuracy of the instrument over its dynamic range, which extends from 0.02 to 15-mu-T. The AMEX-3D was tested in the field by asking electric-utility distribution linemen to wear AMEX-3D and EMDEX meters simultaneously while working. Agreement between the two measures of exposure was excellent.
引用
收藏
页码:413 / 427
页数:15
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