Management Procedure 2585 Rev. F
2
1 Introduction and UUC Performance Requirements
1.1 This procedure describes the calibration of the PosiTector UTG Ultrasonic Thickness
Gage and probe.
Table 1-1 Measurement Ranges
Models Measurement Range * Velocity Range
UTG, UTG-STD, UTG-C
UTG-CA, UTG-CLF, UTG-CX
1.0 - 125 mm
(0.040 - 5.000”)
1,250 to 10,000 m/s
(0.0492 to 0.3930 in/µs)
UTG-M & UTG-ME
2.5 - 125 mm
(0.100 - 5.000”)
UTG-P
0.200 – 12.000 mm
(0.008 – 0.472”)
* The actual measurement range of the system depends on the material being measured.
Ranges shown are based on carbon steel.
The unit being calibrated will be referred to as the UUC (unit-under-calibration).
2 Measurement Standards and Support Equipment Performance Requirements
2.1 The UUC accuracy requirements are based upon the published UUC performance
specifications.
2.2 Minimum-Use-Specifications are the minimum test equipment specifications required to
meet all the UUC accuracy requirements and the test uncertainty ratio applied.
2.3 The uncertainty ratio applied in this Calibration Procedure is 4:1 unless otherwise stated.
The UTG-P has an uncertainty ratio of 2:1.
Table 2-1 UUC Accuracy Requirements and Description
Model Range
Performance
Specifications Test Method
UTG, UTG-STD, UTG-C
UTG-CA, UTG-CLF, UTG-CX
1.0 - 125 mm
(0.040 - 5.000”)
± 0.03 mm
(± 0.001”)
Compare to
Step Blocks
UTG-M & UTG-ME
2.5 - 125 mm
(0.100 - 5.000”)
± 0.03 mm
(± 0.001”)
Compare to
Step Blocks
UTG-P
0.200 – 12.000 mm
(0.008 – 0.472”)
± 0.010 mm
(± 0.0004”)
Compare to
Step Blocks
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