OHAUS FD SERIES Service Manual

Also see for FD Series: Instruction manual User guide Quick start guide

Contents

OHAUS FD SERIES Service Manual Manual pdf 27 page image

3-11CHAPTER 3 SCALE TESTING AND CALIBRATION1. Zero the scale.2. Place a test weight equal to 1/2 the scale capacity in the center of the weighing Pan andrecord the reading.3. Move the test weight to the mid-point between the center and the left edge of the weighingPan and record the reading.4. Move the test weight to the mid-point between the center and the rear of the weighing Panand record the reading.5. Move the test weight to the mid-point between the center and the right edge of the weighingPan and record the reading.6. Move the test weight to the mid-point between the center and the front of the weighingPan and record the reading.7. Subtract the center position reading from the reading at each outer position. The differenceat each test position should be within the off center load tolerance specified in Table 3-4.3.6.4 Linearity TestThe Linearity test is used to determine the linearity of the scale throughout its operating range.NOTE::::: The scale must pass the Repeatability and Off-Center Load Tests before the Linearity test isperformed. Before performing this test, calibrate the scale according to Appendix A.1. Place masses totaling 1/3 of the capacity of the scale on the Pan and note the weight. Setthis mass aside, it will become the test mass.2. Place masses totaling 1/3 of the capacity of the balance on the Pan and zero the scale.3. Place the test mass on the Pan and record the weight.4. Place masses totaling 2/3 of the capacity of the scale on the Pan and zero the scale.5. Place the test mass on the Pan and record the weight.6. The difference of the 3 recorded weights should be less than or equal to the tolerance valueslisted in Table 3-4.3.6.3 Off-Center Load Test (Cont.)