TM 5-3895-374-10....................................................................................................................................................... Meters by Average Value6-MINUTE TIMED VERIFICATIONSThe 6-minute timed scale test provides a convenient method for verifying belt scale calibrations under controlledconditions. The operator controls the start of the test. During the following 6-minute interval, the average equivalentaggregate rate, accumulated tons and average belt speed is measured for each scale. This data is automatically printed atthe end of the interval.NOTE:Belt speed is printed because the equivalent rate and totals determined by test weights is directly proportional tobelt speed. On generator supplied plants, belt speed is proportional to generator frequency.1)Start belt conveyors, run empty for at least 15 minutes and verify or establish a stable zero reading.2)Select the METER CALIBRATION BY AVERAGE VALUE display (key strokes 8652). See Figure 8652.53)Optional: Restart the 6-minute Interval by selecting Option 6. At the end of 6 minutes a record verifying zero willbe printed.4)Place theasphalt switch inDIVERT LOCKED position! Lower the test weights on the scale.5)Restart the 6-minute Interval by selecting Option 6. At the end of 6 minutes a record of the equivalent aggregaterate will be printed. See Figure 8652.6. Verify this data is (within allowable tolerance) equal to the valuesrecorded during scale certification.NOTE:Left unattended, the computer will continue to repeat these 6-minute tests and printouts.page F - 75SYSTEMS Equipment Corp. 8/31/89 Page (40)
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