OHAUS EB SERIES Service Manual

Contents

OHAUS EB SERIES Service Manual Manual pdf 42 page image

CHAPTER 4 FINAL TESTING & CALIBRATIONOhaus Corporation www.ohaus.com 4-4 EB Series Scales Service Manual4.1.4 Linearity TestThe linearity test is used to determine the linearity of the scale throughout its operating range.The results should be in accordance with the specifications shown above. The reference massshould be approximately 1/8 of the full-capacity of the scale.NOTE: The scale must pass the Off-Center Load test and Repeatability Test before theLinearity Test is performed.USE THE SAME REFERENCE MASS THROUGHOUT THE LINEARITY TEST.1. Press ZERO to zero the display.2. Place the reference mass on the center of the pan and record the exact value (alldecimal places) displayed.3. Remove the reference mass and verify that the display returns to zero. If it does not,disregard the reading, press ZERO to rezero the display, and take the reading again.4. Place a mass equal to 1/4 of the full scale capacity on the pan and press ZERO.5. Add the reference mass to the center of the pan and record the exact valuedisplayed.6. Remove the reference mass and verify that the display returns to zero. If it does not,disregard the reading, press ZERO to rezero the display, and take the reading again.7. Place a mass equal to 1/2 of the full-scale capacity on the pan and press ZERO.8. Add the reference mass to the center of the pan and record the exact valuedisplayed.9. Remove the reference mass and verify that the display returns to zero. If it does not,disregard the reading, press ZERO to rezero the display, and take the reading again.10. Place a mass equal to 3/4 of the full scale capacity on the pan and press ZERO.11. Add the reference mass to the center of the pan and record the exact valuedisplayed.12. Remove the reference mass and verify that the display returns to zero. If it does not,disregard the reading, press ZERO to rezero the display, and take the reading again.13. Calculate the weight differences between the reading as shown in the recordedreadings.14. The Maximum difference should be less than or equal to the Linearity specificationfor the scale.