피에조콘 시험 ZERO READING (cptu)

피에조콘 시험 ZERO READING

영신컨설턴트 (02) 529 8803   2016.7

Zero readings:
ASTM standard, not exceed 2 % FSO for the cone tip, sleeve, and pressure transducer.
하중이 없는 상태에서 시험 전 ZERO READING과 시험 종료 시 차이 값이 허용치 이내여야 한다 

full scale output (FSO) = Maximum Load MPa

시험 전 Zero reading 값 on the first data line you will find the first zero reading before the test.
NA = QC (MPa)   NB = fs (kPa)   NC = U (kPa)
It is presented as the digital value offset multiply with the resolution for each channel.

HA=1,HB=1,HC=CPTLOG-2.00,HD=2012-01-03,HG=,HK=Test1_4447,HM=07,HN=4447,HO=0.00,HQ=MRT,HX=0.00,HY=0.00,HZ=0.00,KQ=1268.00,KF=3755.00,KU=3974.00,MA=0.844,MB=0.000,MC=10.0,MD=150.0,MF=0.000,CA=0,CB=0,ZTE=20120103095652503,CSN=4447,EZTE=20120103104100900

D=0.000,QC=0.0000,FS=0.0,U=0.0,TA=0.00,B=0,A=0.00,%20120103100031611,NA=8.1223,NB=125.1,NC=233.1  시험 전 Zero reading 값
D=0.020,QC=0.2081,FS=0.9,U=4.0,TA=1.99,B=7,A=0.00,%20120103100037244
D=0.040,QC=0.2700,FS=0.8,U=4.5,TA=1.88,B=10,A=0.00,%20120103100039672
D=0.060,QC=0.2441,FS=0.5,U=4.1,TA=1.97,B=14,A=0.00,%20120103100041688
D=0.080,QC=0.1894,FS=0.3,U=4.3,TA=2.06,B=18,A=0.00,%20120103100042515
D=15.780,QC=1.0109,FS=12.4,U=693.4,TA=4.99,B=21,A=0.00,%20120103102711006
D=15.800,QC=1.0066,FS=12.2,U=691.6,TA=4.98,B=22,A=0.00,%20120103102712158
D=15.820,QC=1.0121,FS=12.3,U=691.6,TA=5.01,B=22,A=0.00,%20120103102712959,

NA=0.0187,NB=-1.4,NC=-1.5,TD=0,F=15,K=90 시험 후 Zero reading 값 차이

On the last data line you will found the second zero reading after the test.
This is presented as the difference from the first readings
NA = QC (MPa)  NB = fs (kPa)   NC = U (kPa)

For example:
Qc = 0.0187 MPa difference from the start
Fs = -1.4 kPa difference from the start
U = -1.5 kPa difference from the start

2. Calibration 교정주기 international standard ISO 22476-1 6개월마다

교정 시 온도
온도는 ZERO READING 전 15분 지반 섭씨 6-8도 온도와 동일한 온도와 유지 위한 냉장고 같은 장치가 있습니다. PROBE 온도범위 0 - 40 deg. Celsius.