The five types of white cells and the approximate percentage they make up in the blood are: 1  Neutrophils (55% to 70%) 2  Band neutrophils (0% to 3%) 3  Lymphocytes (20% to 40%) 4  Monocytes (2% to 8%) 5  Eosinophils (1% to 4%) 6  Basophils (0.5% to 1%)
A sound level meter is an instrument that can measure sound level, commonly used in noise pollution studies for the quantification of different kinds of noise, especially for industrial, environmental and aircraft noise. common variant of the sound level meter is a noise dosemeter (dosimeter in American English). However, this is now formally known as a personal sound exposure meter (PSEM) and has its own International standard IEC 61252:1993.
slow measurement response: the exponential-time-averaging done in a sound level meter every 1000 milliseconds. Slow time response has been used in conjunction with C-weighting when measuring blast noise or other low frequency impulse sources and is available in most types of sound level meters.PCA Impulse Noise Study: FINAL REPORT, MAY 1991. impulse noise ranging from:  no level for impulse noise is too low to be ignored to: lack of an impulse standard does not place the public's hearing in jeopardy .