OHAUS Explorer Balances Service Manual

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Contents

OHAUS Explorer Balances Service Manual Manual pdf 55 page image

CHAPTER 4 - TESTINGExplorer® Series Service Manual 49 Ohaus Corporation www.ohaus.comRepeatability Test – Approved modelsThis test is a variation of the test above. Rather than determining acceptance based on thestandard deviation of the errors, MPE is used. The other variation is that 2 series of weighings areused, 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 ifnecessary.3. The difference between the results of the 10 readings must be less than the absolute valueof the Maximum Permissible Error (MPE) for the load. The MPE for each load in grams isgiven in Table 1-1.4.4.3 Linearity TestThis test is used to determine the linearity of the unit throughout its operating range. The massesused to perform this test can be utility masses.This is a reference test for approved balances as there is no linearity specification. The approvedmodels 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 theLinearity Test is performed.TABLE 4-3 LINEARITY TEST - REFERENCE AND LOAD MASSESModel Reference Mass Load 1 Load 2 Load 3EX124 30g 30g 60g 90gEX224 50g 50g 100g 150gEX324 75g 75g 150g 225gEX223 50g 50g 100g 150gEX423 100g 100g 200g 300gEX623 150g 150g 300g 450gEX1103 250g 250g 500g 750gEX2202 500g 500g 1000g 1500gEX4202 1000g 1000g 2000g 3000gEX6202 1500g 1500g 3000g 4500gEX10202 2500g 2500g 5000g 7500gEX6201 1500g 1500g 3000g 4500gEX10201 2500g 2500g 5000g 7500gEX12001 1500g 1500g 3000g 7500gEX24001 5000g 5000g 10000g 17500gEX35001 5000g 5000g 10000g 25000gNOTE: All masses are nominal values. Be certain to use the same reference mass throughout theprocedure.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.