Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

Photocoupler

1. Average particle concentration at the sampling point

C1+C2+...Cn

A = —————————

N

Where: A: average particle concentration of a certain sampling point (grain/m3) C1: particle concentration of a certain sampling point (grain/m3) C2: sampling times of a sampling point (times). 2. average Mean:

A1+A2+...AL

M = ——————————

L

Where: M: average particle concentration in the clean zone, ie the mean of the mean; (granules/m3) L: total number of sampling points in a clean room (units). 3, standard error

Where: SE: standard error of the mean of the mean, (granules / m3)

4, the upper limit of confidence: UCL = M + t × SE

Where: UCL: 95% confidence limit for the mean mean (grain/m3); t: t distribution coefficient for the 95% confidence limit (see table below);

T-distribution coefficient of 95% confidence limit

Sampling point L 2 3 4 5 6 7 8 9 ≥9

T 6.31 2.92 2.35 2.13 2.02 1.94 1.90 1.86

Note: When the sampling point is more than 9 points, there is no need to calculate UCL