OHAUS Ranger 7000 Instruction Manual

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OHAUS Ranger 7000 Instruction Manual Manual pdf 47 page image

RANGER®7000 SCALES EN-45With the scale turned ON and no load on the pan, start Span Calibration to initiate theprocedure. Additional calibration values to be used are shown on the display. The bestaccuracy is achieved using the mass closest to the full span value.5.3.4 Linearity CalibrationLinearity calibration uses three calibration points, one at zero load and the others atspecified loads. Refer to Table 5.1 for Linearity values.TABLE 5-1 Calibration MassesModel Linearity Calibration Points Weight ClassR71MHD3 0 kg, 1.5 kg, 3 kg ASTM Class 2 OIML F1R71MHD6 0 kg, 3 kg, 6 kg ASTM Class 2 OIML F1R71MHD15 0 kg, 10 kg, 15 kg ASTM Class 2 OIML F1R71MHD35 0 kg, 20 kg, 35 kg ASTM Class 2 OIML F1R71MD3 0 kg, 1.5 kg, 3 kg ASTM Class 5 OIML M1R71MD6 0 kg, 3 kg, 6 kg ASTM Class 5 OIML M1R71MD15 0 kg, 10 kg, 15 kg ASTM Class 5 OIML M1R71MD35 0 kg, 20 kg, 35 kg ASTM Class 5 OIML M1R71MD60 0 kg, 30 kg, 60 kg ASTM Class 5 OIML M15.3.5 Internal Calibration (R71MHD models)Calibration is accomplished with the internal calibration mass. Internal calibration can be performed atany time, provided the scale has warmed up to operating temperature and is level.With the Scale turned ON and no load on the pan, select Internal Calibration.The Scale begins to calibrate.The display shows the status, then returns to the current application.To cancel at any time, press .5.3.6 Automatic Calibration (R71MHD models)When Automatic Calibration is set ON, the scale performs a self-calibration:• when it senses a temperature change of 1.5°C• or every 11 hoursAutoCal will automatically calibrate the Scale (using the internal mass) each time there is a change intemperature significant enough to affect accuracy.Note: * Automatic Calibration function is only available in certain regions.5.3.7 AutoCalTM Adj (Adjustment)Use this calibration method to adjust the span calibration point, without affecting the span or linearity calibration.Calibration Adjust may be used to adjust the result of the Internal Calibration by +100 divisions.Note: Before making a calibration adjustment, perform an Internal Calibration. To verify whether an adjustment isneeded, place a test mass equal to the span calibration value on the pan and note the difference (in divisions)between the nominal mass value and the actual Balance reading. If the difference is within +1 division, calibrationadjustment is not required. If the difference exceeds +1 division, calibration adjustment is recommended.Example:Actual weight reading: 200.014Expected weight reading: 200.000 (Test mass value)Difference Weight (d): 0.014Difference weight in digits: –14 (Adjust value)To perform a Calibration Adjustment, touch AutoCal Adjustment from the Calibration Menu; Enter the value(positive or negative divisions) to match the difference noted earlier in the procedure.Recalibrate using Internal Calibration. After calibration, place the test mass on the pan and verify that the massvalue now matches the displayed value. If not, repeat the procedure until Internal Calibration reading agrees withthe test mass.Once completed, the balance stores the Adjustment value and the display returns to the current application.www. .com information@itm.com1.800.561.8187