4-6
CHAPTER 4 MAINTENANCE PROCEDURES
4.2.3 Performance Tests
Accurate performance of a Scout balance is determined by a series of three perfor-
mance tests. The displayed readings are compared with the tolerances listed in Table
4-2. Tolerance values are expressed in counts. A one count change is equal to the last
digit shown on the balance display.
TABLE 4-2. TYPES OF PERFORMANCE TESTS
PERFORMANCE TEST
TOLERANCE
Precision
+1 Count
Off Center Load
+1 Count
Centered Load
+1 Count
The following performance tests are used to evaluate the balance operation before and
after repairs. Each balance tested must meet the requirements specified in each test
as well as the specifications listed in Table 1-2. Before proceeding with the following
tests, all the procedures starting with paragraph 4.2 must have been accomplished on
the balance first. Tolerance values are expressed in counts. A balance which passes
each of these three tests meets the manufacturing specifications.
4.2.3.1 Precision Test
Precision is a word used in balance specifications meaning the Standard Deviation of
a set of similar weight readings. To determine whether a balance meets the calculated
Standard Deviation value in the Specification Table 1-2, perform the following test:
Test
1. Tare the balance. The reading on the display should be 0g.
2. Select a mass weighing near the maximum capacity of the balance and place
the mass on the
center of the Pan (6). Observe and record the reading.
3. Remove the mass. Reading should return to 0g +1 count.
4. Repeat this test for ten readings. If the standard deviation of the readings is
less than +1 count, the balance passes the Precision Test.
Summary of Contents for SCOUT
Page 1: ...OhausCorporation 29HanoverRoad FlorhamPark NJ 07932 0900 ELECTRONIC BALANCES SERVICE MANUAL TM...
Page 6: ...i v...
Page 10: ...1 4 CHAPTER 1 INTRODUCTION...
Page 38: ...5 2 CHAPTER 5 DRAWINGS AND PARTS LISTS...
Page 39: ...5 3 CHAPTER 5 DRAWINGS AND PARTS LISTS Figure 5 1 Exploded View of Balance 5 3 5 4...
Page 43: ...SCOUT ELECTRONIC BALANCES P N 300040 010 R1198...
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