Extech Instruments TB400 - Page 4

TB400-en-GB_V1.3 8/16
4
Calibration
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Acompletecalibrationwillrequiretestingwithboth0NTUand100NTUtestsolutions.
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Ensurethatthesidesofthebottlearecleananddrytopreventmeasurementerrors.
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CalibrationProcedure(0NTUand100NTU)
Note:Makesureyoucompletethecalibrationstepswithaslittletimeaspossiblebetween
the0NTUandthe100NTUtestbottles.
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1. InserttheZeroNTUsolutionbottleintothetestingchamber,lineupthewhitemarks,and
closeandlatchthecover.TurnonthemeterandPressandholdthe"CAL"buttonuntilthe
LCDdisplays"CAL"thenreleasethe“CAL”button.
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2. WaitonesecondandthentheLCDwilldisplay:
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Note:IftheLCDdoesnotdisplayzerowhenusing"0NTU"liquid,pressthe"ZERO"button
continuouslyuntiltheLCDdisplays
azerovalue.
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3. Themeterisnowreadyfor"0NTU"calibration.
4. Momentarilypress"CAL"button.TheLCDwillflashCALforabout10secondsandthenshow
thefollowingdisplay:
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5. TheLCDwillthendisplay:
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6. Liftthelidonthetestchamberand
removethe0NTUtestsolutionbottle.
CAL
ntu
0.00
CAL ntu
CAL
0.00 ntu
100
CAL ntu
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