G-205
Calibration Verification of Digital Micrometers
Original Document
Scanned document (image-only PDF)
Extracted Text
Searchable text extracted from PDF
1.0 Purpose
The purpose of this SOP is to describe the procedure for a three point calibration verification of
digital micrometers.
2.0 Scope
This procedure is for the calibration verification of micrometers. This SOP does not cover the
calibration or repair of any length measuring device.
3.0 Responsibility
3.1 It is the responsibility of QC Laboratory Personnel to follow this procedure.
3.2 It is the responsibility of QC Laboratory Management to ensure the procedure is current
and is being followed.
4.0 Definitions
41 ISO — International Organization for Standardization
4.2 EC — International Electrotechnical Commission
43 NIST — National Institute of Standards and Technology
44 ANSI - American National Standards Institute
4.5 | NCSL ~ National Conference of Standards Laboratories
4.6 QC — Quality Control
5.0 References
5.1 G-201-F2, Form, Calibration Certificate
5.2 G-201, SOP, Calibration Program
[SOP G-205 | Page 2 of 3]
Standard Operatii ng Procedure SCO2P0 N8o Re3 v Page 2 of 3
Calibration Verification of Digital Micrometers
6.0 Procedure
6.1 Refer to SOP G-201 Calibration Program for calibration schedule and instructions on
the documentation of the calibration verification.
6.2 It is recommended that micrometers are verified or calibrated at an external calibration
laboratory at least once every five years.
6.3 If a micrometer fails internal calibration verification and the instrument is able to be
calibrated the unit must be calibrated and recertified by an external laboratory before
returning to service.
6.4 Gauge block standards:
6.4.1 A gauge block set is to be used as reference standards. The gauge blocks must
be verified against NIST traceable standards that have been externally calibrated
and verified in compliance with ISO/IEC Guide 25 and/or ANSI/NCSL Z540.3-
2006 requirements or newer.
6.4.2 Gauge blocks intended for use in calibrating micrometers require certification
every five years.
6.5 Verification process
6.5.1 All measurement readings are recorded in millimeters. Change unit of measure
if necessary.
6.5.2 Zero the micrometer prior to calibration verification.
6.5.3. Perform verification at three points across the range of the micrometer. Typical
narrow range micrometer range is 1.00mm to 10.00mm and wide range
micrometer range is 1.00mm to 100mm. Select gauge blocks representative of
the low, middle and high ranges of the micrometer.
6.5.4 All three test lengths must be within tolerance to pass verification.
6.5.5 All instrument information, calibration verification and environmental data
should be documented on form G-201-F2 Calibration Certificate.
6.5.6 The common tolerance for verification of narrow range micrometers is +/-
0.05mm and for Wide Range Micrometers +/- 0.1mm unless otherwise specified
by the needs of the application or recommended by the equipment manufacturer.
6.5.7 The verification cycle for micrometers is 1 year.
[SOP G-205 | Page 3 of 3]
Standard Operating Procedure SOP No Rev
G-205 Page 3 of 3
Calibration Verification of Digital Micrometers
6.5.8 If a micrometer is removed from service for any reason including failed
verification, the device in the Calibration Schedule must be lined out with the
notation “removed from service.” The device is no longer permitted in GMP
work areas until recertified.
6.5.9 For devices that pass verification a calibration sticker will be attached and the
unit returned to service.
7.0 Revision History
| Rev | Date | Description of Changes | CCR # | By |
|-----|----------|------------------------|-------|----|
| 0 | 10/06/10 | New - - | - | - |
| 1 | 04/01/13 | Changed the SOP format & Number 2 O7/OVS caitraion toverfeaRetmoiveod fno,n 15-0879 B. Johns | 13-246 | B. Johns |
| 3 | 04/08/19 | { Scheduled review: No changes | 19-0242 | J. Maignan |