OHAUS NV212 Service Manual

Also see for Navigator NV1101: Instruction manual Instruction manual

Contents

OHAUS NV212 Service Manual Manual pdf 33 page image

CHAPTER 4 TESTINGNavigator Series Service Manual 27 Ohaus Corporation www.ohaus.com4.5 PERFORMANCE TESTSAccurate performance of the Navigator scales is determined by a series of four performance tests.The displayed readings are compared with the tolerances listed in Tables 4-2 and 4-3. Tolerancevalues are expressed in counts. A one-count difference is shown in the last digit on the scaledisplay.TABLE 4-2 TOLERANCESModel Precision (d) Repeatability (d) Linearity (d) OCLNV212 ±1 2 ±2 ±3NV311(N or M) ±1 1 ±2 1 MPENV511 ±1 2 ±2 ±3NV1101 ±1 2 ±2 ±3NV2101 ±1 2 ±2 ±3NV4101 ±1 2 ±2 ±3NV5101 ±1 2 ±2 ±3NVL511 ±1 2 ±2 ±3NVL1101 ±1 2 ±2 ±3NVL2101 ±1 2 ±2 ±3NV3100(N or M) ±1 1 ±2 1 MPENVL5101 ±1 2 ±2 ±3NVL10000 ±1 2 ±2 ±3NVL20000 ±1 2 ±2 ±3NVT1601 ±1 2 ±2 ±3NVT1601(N or M) ±1 1 ±2 1 MPENVT3201 ±1 2 ±2 ±3NVT3200(N or M) ±1 1 ±2 1 MPENVT6400(N or M) ±1 1 ±2 1 MPENVT6401 ±1 2 ±2 ±3NVT10001 ±1 2 ±2 ±3NVT16000 ±1 2 ±2 ±3NVT16000(N or M) ±1 1 ±2 1 MPENOTE:The following performance tests are used to evaluate scale operation before and after repairs. Thescale must meet the requirements specified in each test as well as the specifications listed in Table4-2. Before proceeding with the following tests, the scale should be calibrated. (See Appendix A)4.5.1 Precision TestThe Precision Test is a quick test that measures the deviation of a limited number of weightreadings, which should match the specification for each model, listed in Tolerance Table 4-2.1. Power on the balance. The reading on the display should be 0g.2. Select a mass weighing near the maximum capacity of the balance, and place it on the centerof the Pan. Observe and record the reading.3. Remove the mass. The reading should return to 0g ± the precision tolerance in Table 4-2.