OHAUS EC SERIES Service Manual

Also see for EC Series: Instruction manual Instruction manual

Contents

OHAUS EC SERIES Service Manual Manual pdf 22 page image

3-8CHAPTER 3 SCALE TESTING AND CALIBRATION3.6 PERFORMANCE TESTSFigure 3-3. Segment Display.3.6.2 Repeatability TestRepeatability is the Standard Deviation of a set of similar weight readings.Requirements:To perform this test a single mass must be used for all readings.The test mass should be approximately 1/2 of the capacity of the scale.Before starting a repeatability test, set up the scale as follows:Set Up:Enter the menu and adjust and record the following setting.A. Set the Filter level to 1.B. Set the AZT (Auto Zero Tracking) to 1d.C. Set the scale to display the same units as the performance specifications.D. Set the Zero return to 0.Record Settings:Filter Level Setting = ____________Auto Zero Tracking Setting = ____________Displayed Units = ____________Zero Return = ____________Mass Used = ____________Accurate performance of the EC Series Scales is determined by a series of three performance tests,Repeatability Test, Off-Center Load Test and Linearity Test. These tests are used to evaluate the scaleperformance before and after repairs. Each scale tested must meet the requirements specified in each testas well as the specifications listed in Table 3-4. A scale passing each of these three tests complies withOhaus specifications. A segment display test determines if the display is working properly.3.6.1 Segment Display TestConnect the AC Adapter into a suitable power source and connect it to the scale. Turn the scale on, all999999 segments are displayed followed by a countdown of 8's. 7's, 6's and so on until all zeros arereached briefly followed by a software revision number. This is a segment display test. Figure 3-3illustrates the starting of the display test.