OHAUS FD SERIES Service Manual

Also see for FD Series: Instruction manual User guide Quick start guide

Contents

OHAUS FD SERIES Service Manual Manual pdf 26 page image

3-10CHAPTER 3 SCALE TESTING AND CALIBRATIONFigure 3-6. Sample Calculation of Standard Deviation ( ) for FD3 Scale.Reading Weight (kg) Weight - Mean (Weight – Mean) 21 3000.5 0.4 0.162 3000.0 -0.1 0.013 3000.5 0.4 0.164 3000.0 -0.1 0.015 3000.5 0.4 0.166 3000.0 -0.1 0.017 2999.5 -0.6 0.368 3000.0 -0.1 0.019 3000.0 -0.1 0.0110 3000.0 -0.1 0.01SUM = 30,001 SUM =0.9Mean = SUM/10 Variance SUM/9= 0.1Mean ===== 3,000.1 = Variance===== 0.316228Figure 3-7. Off-Center Load Test Weight Locations.σσσ√3.6.3 Off-Center Load TestThe Off-Center Load Test is used to determine whether displayed weight values will be affected by movingthe load to different areas of the weighing Pan. See Figure 3-7.3.6.2 Repeatability Test (Cont.)NOTE: The above table represents a passing test. The results must be less than or equal to the Repeatabilityshown in table 3-4.