CHAPTER 4 - TESTING
Explorer
®
Series Service Manual 49 Ohaus Corporation www.ohaus.com
Repeatability Test – Approved models
This test is a variation of the test above. Rather than determining acceptance based on the
standard deviation of the errors, MPE is used. The other variation is that 2 series of weighings are
used, one near 50% of max and the other near 100% of maximum capacity.
1. See Table 1-1 to determine the two weight values that must be used.
2. Record 10 reading using each weight value. Zero the balance between each reading if
necessary.
3. The difference between the results of the 10 readings must be less than the absolute value
of the Maximum Permissible Error (MPE) for the load. The MPE for each load in grams is
given in Table 1-1.
4.4.3 Linearity Test
This test is used to determine the linearity of the unit throughout its operating range. The masses
used to perform this test can be utility masses.
This is a reference test for approved balances as there is no linearity specification. The approved
models should be able to pass this test so it is still valid to determine balance performance.
NOTE:
The balance must pass the Precision and Repeatability Tests, and be calibrated before the
Linearity Test is performed.
TABLE 4-3 LINEARITY TEST - REFERENCE AND LOAD MASSES
NOTE: All masses are nominal values. Be certain to use the same reference mass throughout the
procedure.
1. Place the Reference Mass on the Balance, record the weight and remove.
2. Place Load 1 on the Balance and press TARE.
3. Place the test mass on the Balance, record the weight and remove.
4. Place Load 2 on the Balance and press TARE.
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