CHAPTER 4 TESTING
Valor 1000 Series Service Manual
21
Ohaus Corporation www.ohaus.com
TEST PROCEDURE:
Zero the instrument, if it does not read zero.
Using a test mass approximately half the capacity of the instrument, place the mass on the
center of platform. Record the reading on the worksheet provided.
Remove the mass from the platform.
Repeat this test starting at Step 1 until you record a total of ten readings
Fill in the worksheet (Table 4-2) with the ten (10) readings.
TABLE 4-2. REPEATABILITY WORKSHEET
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 = Square Root of (sum of (Delta x Delta) / 9)
5. Add the ten readings and divide the total by 10 to find the Mean (average).
6.
Mean = (Reading 1 + Reading 2 + Reading 3 + Reading 4 + Reading 5
+ Reading 6 + Reading 7+ Reading 8 + Reading 9 + Reading 10) / 10
Mean =
________
7.
Calculate the Delta for each reading and record in the work sheet.
Delta = Reading
– Mean
8.
Calculate the Delta x Delta for each reading and record in worksheet.
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