Working With B-Scan Thickness Mapping - GE MFE DMS 2 Operating Manual

4. Measuring Thickness
Use the following procedure to select a rectification option.
Negative rectification is the default option and will satisfy most
applications and operators.
Step 1: If necessary, activate the TG Primary Menu (TG
mode) by pressing .
Step 2: Press simultaneously to activate the TG
Secondary Menu (Figure 3-3).
Step 3: Activate the SETUP Submenu by selecting it with
or so that it's highlighted. Five selections will appear
across the bottom of the display screen.
Step 4: Press below the selection titled RECTIF. You'll
note that the following four options are available:
• NEG—Used for most applications; default for most dual-
element probes (shows the negative component of the RF
signal but displays it in a positive orientation). The
icon will appear at the top of the display screen.
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• POS—Default for most single-element probes. The
icon will appear at the top of the display screen.
• FULL—Shows the positive and negative halves of the RF
wave, but both are oriented in the positive direction. The
icon will appear at the top of the display screen.
• RF—Used for special applications where it's beneficial to
have the entire wave displayed (with no rectification). The
icon will appear at the top of the display screen.
Step 5: The rectification method will be set to the configuration
last chosen.
4.5

Working with B-scan Thickness Mapping

B-scan thickness mapping allows the user to measure the
thickness of a section of material, for a period of up to 21
seconds, and display a graphical cross-section of the mea-
sured thickness. Figure 4-16 shows a typical B-scan display
over a period of 21 seconds (shown on the horizontal axis).
See Figure 4-16 for a description of the various B-scan
operating features. Then, use the following procedures to
configure the DMS 2 to operate in B-scan mode.
NOTE: For the DMS 2 only, and only functions in the SIP,
Dual, T-COAT, and AUTO-V measurement modes. (Refer to
Section 3.3.1 to change modes.)
DMS 2 Operating Manual