OHAUS EC SERIES Service Manual

Also see for EC Series: Instruction manual Instruction manual

Contents

OHAUS EC SERIES Service Manual Manual pdf 23 page image

3-9CHAPTER 3 SCALE TESTING AND CALIBRATION3.6.2 Repeatability Test (Cont.)Test Procedure:1. Zero the scale.2. Using a test mass approximately 1/2 the capacity of the scale, place the mass on the center ofplatform. Record the reading on the worksheet provided.3. Remove the mass from the platform.4. Repeat this test starting at step 1 until you record a total of ten readingsFill in this worksheet with the ten (10) readings.n Reading Delta = Reading – Mean Delta x Delta12345678910n = number of Reading Mean = Sum of Readings / 10 Delta = Reading – MeanStandard Deviation = The Square root of (the sum of the (Delta x Delta) / 9)5. Add the ten readings and divide the total by 10 to find the Mean (average).Mean = (Reading 1 + Reading 2 + Reading 3 + Reading 4 + Reading 5+ Reading 6 + Reading 7+ Reading 8 + Reading 9 + Reading 10) / 10Mean =________Mean =________Mean =________Mean =________Mean =________6. Calculate the Delta for each reading and record in the work sheet.Delta = Reading - Mean7. Calculate the Delta x Delta for each reading and record in worksheet.8. Add the ten Delta x Delta values and divide by 99. Calculate the Standard Deviation by applying the square root of the result from step 8.Standard Deviation =___________