3-9
CHAPTER 3 SCALE TESTING AND CALIBRATION
3.6.2 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 of
platform. 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 readings
Fill in this worksheet with the ten (10) readings.
n
Reading
Delta = Reading – Mean
Delta x Delta
1
2
3
4
5
6
7
8
9
10
n = number of Reading
Mean = Sum of Readings / 10
Delta = Reading – Mean
Standard 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) / 10
Mean =________
Mean =________
Mean =________
Mean =________
Mean =________
6. Calculate the Delta for each reading and record in the work sheet.
Delta = Reading - Mean
7. Calculate the Delta x Delta for each reading and record in worksheet.
8. Add the ten Delta x Delta values and divide by 9
9. Calculate the Standard Deviation by applying the square root of the result from step 8.
Standard Deviation
=___________
Summary of Contents for EC Series
Page 2: ......
Page 4: ......
Page 14: ...2 6 CHAPTER 2 DIAGNOSIS...
Page 30: ...3 16 CHAPTER 3 SCALE TESTING AND CALIBRATION...
Page 52: ...A 4 APPENDIX A SERVICE MODES...
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Page 56: ...PN 80010584 B SERVICE MANUAL EC SERIES SCALES 80010584...
