1-5Q-5.What calibration label is used when actual measurement values must be known to use the testequipment?Special Calibration LabelsTwo SPECIAL CALIBRATION labels are shown in view C of figure 1-1 that have black letteringand a yellow background; the size and content of the labels are different. A SPECIAL CALIBRATIONtag (figure 1-1, view C) is used with the smaller of the two labels. These labels or tag are used when someunusual or special condition in the calibration should be drawn to your attention.Such special conditions may be deviations from usual calibration tolerances, multiple calibrationintervals, or a requirement for in-place calibration. The special condition that resulted in the SPECIALCALIBRATION label should be described on the large label when sufficient space is available on theinstrument or on the tag when the small label is used. Brief descriptions of special conditions are providedin the following paragraphs.Q-6.An instrument that must be calibrated in place requires what type of calibration label?In cases where you do not require full instrument capability, the calibration can be performed withreduced tolerances or cover less than all ranges and parameters. This approach is often used when theinstrument does not meet full calibration tolerances on certain ranges or parameters, but can still meetuser requirements. On the other hand, the special calibration may be for higher accuracy than usual on ashort-term basis upon your specific request.MULTIPLE CALIBRATION INTERVALS.—Some instruments have components that requirecalibration less frequently than the rest of the instrument. For example, the attenuator in a signal generatormay require calibration every 12 months, whereas the rest of the instrument parameters should becalibrated every 4 months. Since the attenuator calibration is time consuming and may require unavailablestandards, use of the multiple-interval approach can save considerable time (man-hours) as well as permitthe more frequent calibration to be performed at a lower level laboratory.When a specific instrument has been designed for multiple calibration intervals, such information isprovided in the applicable calibration procedure. The SPECIAL CALIBRATION label or tag is annotatedwith the words MULTIPLE INTERVAL, and the type of calibration performed is indicated; for example,partial 1 of 2, 2 of 2, complete calibration, and so forth. The calibration due date reflects the due date ofthe next partial or complete calibration.CALIBRATION IN-PLACE.—Some instruments should be calibrated in-place. Annotation on theSPECIAL CALIBRATION label or tag will alert both you and the calibrator that the instrument shouldnot be removed, but should be calibrated in-place.User Calibration LabelSome test and measuring equipment (T&ME) should be calibrated by you instead of your referringthe instrument to a calibration facility. For example, some instruments, such as hardness testers anddensitometers, are provided with their own standards and should be calibrated each time used, or at leastvery frequently. Some instruments, such as oscillographic recorders, may require calibration before,during, and after each use.Other automatic test equipment (ATE) have self-calibration tests that should be performed each timeused or each day of use. Still other instruments are calibrated as part of checkout procedures performeddaily or weekly and recorded in maintenance logs. Whenever recognized, the requirement for calibration
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
