5.6 UN-PARALLEL SURFACE .......................................................................... 16
5.7 INFLUENCE OF MATERIAL’S TEMPERATURE .................................................. 16
5.8 MATERIAL WITH LARGE ATTENUATION ....................................................... 16
5.9 REFERENCE TEST PIECE ........................................................................... 17
5.10 SEVERAL MEASURING METHODS ............................................................. 18
5.12 CHANGING PROBE ............................................................................... 19
5.13 MEASURING CASTING .......................................................................... 19
6 PREVENTING ERRORS IN MEASUREMENT ........................................... 20
6.1 ULTRA-THIN MATERIAL .......................................................................... 20
6.2 RUST, CORROSION AND PIT .................................................................... 21
6.3 ERROR IN IDENTIFYING MATERIAL ............................................................ 21
6.4 WEARNESS OF PROBE ............................................................................ 21
6.5 OVERLAPPED MATERIAL AND COMPOUND MATERIAL ................................... 21
6.6 INFLUENCE OF OXIDATION LAYER AT METAL’S SURFACE ................................ 21
6.7 ABNORMAL READOUT OF THICKNESS ........................................................ 22
6.8 UTILIZATION AND SELECTION OF COUPLING AGENT ...................................... 22
7. ATTENTION ....................................................................................... 22
7.1 CLEANING THE TEST PIECE ...................................................................... 22
7.2 CLEANING THE INSTRUMENT’S CASE ......................................................... 23
7.3 PROTECTING THE PROBE ........................................................................ 23
7.4 REPLACING BATTERIES ........................................................................... 23
7.5 ABSOLUTELY AVOID COLLISION AND MOISTURE. ........................................... 23
8. MAINTENANCE .................................................................................. 23
9. OPERATION TO RESTORE THE FACTORY PARAMETERS ...................... 25
10.CONFIGURATION .............................................................................. 26
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