OHAUS EB SERIES, Руководство по обслуживанию

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CHAPTER 4 FINAL TESTING & CALIBRATION
Ohaus Corporation www.ohaus.com 4-4 EB Series Scales Service Manual
4.1.4 Linearity Test
The 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 mass
should 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 the
Linearity 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 (all
decimal 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 value
displayed.
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 value
displayed.
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 value
displayed.
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 recorded
readings.
14. The Maximum difference should be less than or equal to the Linearity specification
for the scale.