968 Spectrophotometer Operation Manual ***discontinued ... - X-Rite

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4. CalibrationThe 948 & 968 should be calibrated to the X-Rite standard the first thing each dayand every four hours of operation thereafter. However, a "NEED CALIBRATION"message will appear in the display:•If the calibration procedure has not been performed for 24 hours.•If there is a 10°C change in temperature since the last calibration.•If zero reflectance is measured improperly.•If the lamp output changes.Whenever this message appears the calibration procedure should be performedbefore another measurement is taken to ensure accuracy.Important Calibration Notes• If you change apertures you must change the aperture setting, read zeroreflectance, & calibrate the unit (see Section 4.2, steps 1, 2, & 5a thru 5d).• Dirt or dust in the optics area will cause an inaccurate calibration reading.Refer to Section 8.2 for the optics cleaning procedure.• The ceramic Reflection Standard is dramatically affected by smudgemarks, dust, and finger prints. The standard should be cleaned using a mildsoap and warm water solution, thoroughly rinsed with warm water, and wipeddry with a lint free cloth. You must let the standard dry completely beforetaking a calibration reading.• If you are having linearity problems it’s possible that there is dust in theoptics or Zero Reflectance has drifted. If you improperly measure ZeroReflectance the unit can not automatically detect the drift. If you suspect thisis the case, you should manually activate Read Zero Reflectance byperforming Steps 1, 2, & 5 of Section 4.2.• Do not move the 948/968 while taking a calibration measurement. If motionis detected an error message will be displayed and calibration aborted.28
4.1 Positioning the 968 Onto the X-Rite StandardYou must set the 948/968 on the white standard so that the maximum amount ofthe bottom rubber pad of the shoe resides on the standard, and the target is centeredon the circle. If you do not, the unit may rock slightly and cause an erroneous readingof the standard.1) Center the target window on the White circle, making sure that the rubber pad iscompletely on the standard and is down flat.BOTTOM VIEW2) Take the measurement.29
Page 2 and 3: CAUTION: Operational hazard exists
Page 4 and 5: FCCThis equipment has been tested a
Page 6 and 7: Dear Customer:Congratulations! We a
Page 8 and 9: PROPRIETARY NOTICE: The information
Page 10 and 11: General Description . . . continued
Page 12 and 13: What To Do First!See how to unlock
Page 14 and 15: PACKAGING2
Page 16 and 17: 1.3 Battery Charging> THE UNIT SHOU
Page 18 and 19: Example 2 - Measuring a Coffee CupC
Page 21 and 22: The illuminant/observer will not be
Page 23 and 24: Illuminant/Observer Selection...con
Page 25 and 26: 3.5 Difference MeasurementThe 948 a
Page 27 and 28: Entry of Reference values - By meas
Page 29 and 30: Entry of Reference values - By Nume
Page 31 and 32: 3.6 CMC Difference OperationCMC is
Page 33 and 34: 3.7Measurement Averaging ProcedureW
Page 35 and 36: 3.8 Store Data OperationThe data st
Page 37 and 38: Store Data Operation . . . continue
Page 39: Display Messages . . . continued"CA
Page 43 and 44: X-Rite Reflection StandardX-RiteRef
Page 45 and 46: Calibrating to a White Standard . .
Page 47 and 48: 5. Setting System Parameters5.1 Ave
Page 49 and 50: 5.2 Operation ParametersOperation s
Page 51 and 52: 5.3 RS232 I/O ParametersYour instru
Page 53 and 54: 5.4 Format Output ParametersThis pr
Page 55 and 56: 6. Printing DataThe RS232 parameter
Page 57 and 58: Print Example 2:• Computer ON•
Page 59 and 60: 7. Changing AperturesX-Rite has thr
Page 61 and 62: 8. Maintenance8.1. TroubleshootingT
Page 63 and 64: 8.3. Battery Replacement1. Set the
Page 65 and 66: 8.5. Lamp ReplacementDue to the cir
Page 67 and 68: Specifications . . . continuedStora
Page 69 and 70: A4Spectrophotometer StandX-Rite has
Page 71 and 72: Color Check . . . continued7) After
Page 73: X-Rite, Incorporated----World Headq

968 Spectrophotometer Operation Manual ***discontinued ... - X-Rite

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