3. Setting Up the DMS 2
DMS 2 Operating Manual
Page 67
2. 2-PT (2-point)—Available for DUAL and SIP measure-
ment modes.
•
Calibrates the DMS 2 to two known thicknesses.
•
2-PT calibration is useful when using a curved probe
and calibrating on curved piping, tubes, or bars.
NOTE: The purpose of the calibration procedure is to
determine the velocity at which sound travels in the specific
material being tested. Calibrations must be performed to
ensure reliable measurements.
NOTE: The probe zeroing block is for manual zeroing only,
and should not be used as a thickness calibration standard.
Selecting Known-Thickness Calibration Standards
CAUTION: Closely follow the information given in this
section when choosing a calibration standard.
The 1-PT calibration procedure requires a calibration standard
of the same material (and therefore, with the same velocity of
sound) as the material to be measured. For best results, the
thickness of the standard should be equal to, or slightly greater
than the maximum thickness to be measured.
The 2-PT calibration procedure requires two calibration
standards (or one standard with two calibration thicknesses)
of the same material, velocity of sound, and curvature as the
material to be measured. For best results, the thicker
standard should be equal to, or slightly greater than the
maximum thickness to be measured. The thickness of the
thin standard should be as thin or thinner than the lower end
of the expected measurement range.
NOTE: Many of the visual display features (such as A-scan
height, gate position, and so on) are automatically set based
on information collected during the calibration process.
Failure to select a suitable calibration standard will result in
the need for the operator to make adjustments to the visual
display.
Performing the 1-PT Calibration Procedure
Step 1: The 1-PT procedure must first be selected in the
TGMODE submenu (Section 3.3.1).
Step 2: With a probe connected and properly identified (Sec-
tion 3.3.1), briefly press
. At this point, the probe must be
zeroed if the MANUAL zeroing procedure is specified (Section
3.3.1).
Step 3: Couple the probe to the known-thickness calibration
standard. Be sure to use couplant.
Содержание MFE DMS 2
Страница 2: ...DMS 2 DMS 2E Operating Manual GE Inspection Technologies Ultrasonics Ident Nr 021 002 151 Rev H ...
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Страница 22: ...1 Getting Started DMS 2 Operating Manual Page 11 FIGURE 1 7 The VIRTUAL KEYBOARD is shown here ...
Страница 94: ...3 Setting Up the DMS 2 DMS 2 Operating Manual Page 83 FIGURE 3 11 An Auto Labeler screen is shown here ...